Does anyone maintain a list of problems he/she has solved so far which was interesting and a bit challenging? If so, please share.
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Does anyone maintain a list of problems he/she has solved so far which was interesting and a bit challenging? If so, please share.
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Good day to you,
Well I maintain such list (sadly not for all solved problems, just for those recent).
I'll post it down here — so hope it will help somehow. Usually it is "link [or identifier]" and then number which shall signify its complexity (but it is just my guess so it is usually of :D ). Then there is sometime sample outline solution... so I hope it will help somehow (and hope it doesn't contain much garbage {well sometime the outline is not in english — sorry for it})
NOTE: I've made (on request) the original post smaller (everything shall be inside the "spoler") so deleting the new posts ^_^
http://codeforces.me/contest/696/problem/D 8
http://www.spoj.com/problems/AHOCUR/ 5 //Aho-Corassic + DP
11312 UVA (3)
11392 UVA (4)
http://codeforces.me/contest/653/problem/E (6)
http://codeforces.me/contest/769/problem/C 5 //FL:ODD/**** | bfs+greed NICE
10968 UVA (3) //EASY + NICE (bfs withot <=2 nodes)
http://codeforces.me/contest/796/problem/D (3) //NICE+EASY ... print visited in bfs (not par)
10888 UVA (4) //VERY NICE — but not main technique ... ++ DP /or/ MCMF
http://codeforces.me/contest/821/problem/D (5) //VERY NICE — Consider only points not GRID
http://www.spoj.com/problems/DIGOKEYS/ (4) //Easy [Nice problem — weird statement]
http://www.spoj.com/problems/SPIKES/ (3) //Easy bfs (# of 's' * 2)
http://www.spoj.com/problems/MULTII/ (4) //VERY NICE: BFS over numbers (K*10+d)%N
10977 UVA (3)
928 UVA (3)
13116 UVA (4)
314 UVA (3)
11487 UVA (4)
5622 LA (7)
11931 UVA (5)
http://www.spoj.com/problems/KNMOVE/ 3 //simple knights
http://www.spoj.com/problems/SERGRID/ 3 //almost classical
http://www.spoj.com/problems/NAKANJ/ 3 //Classical chess — KNIGHT
http://www.spoj.com/problems/PUCMM223/ (4) //NICE (but not many languages) — 2 moving [x][y]
http://www.spoj.com/problems/SPIRALGR/ (4) //NICE (not typical) [SIEVE]
http://www.spoj.com/problems/DCEPC706/ (4) //NICE — travelling outside
11645 UVA 4
11375 UVA 3
http://www.spoj.com/problems/MINNUM/ 3 // BIG/9+!!(BIG%9)
10844 UVA 4 //Bell numbers + big (might be slightly slow!)
http://www.spoj.com/problems/NITT2/ 2 //Divisibility by two constants
http://codeforces.me/contest/729/problem/C 3
http://codeforces.me/contest/714/problem/D 8
13150 (UVA) 4
http://codeforces.me/contest/749/problem/D 5
11692 (UVA) 4
11516 (UVA) 3
http://codeforces.me/contest/760/problem/B 3
http://codeforces.me/contest/675/problem/D 4 //dunno — solvable with treap
http://www.spoj.com/problems/NDS/ 4 //BS over LIS
http://www.spoj.com/problems/VECTAR4/ 3
http://codeforces.me/contest/767/problem/D 4 //NICE
http://codeforces.me/contest/627/problem/D (7) //with dp — NICE
http://codeforces.me/contest/779/problem/D (3) //NICE + EASY
http://www.spoj.com/problems/CNTINDX/ (4) //Map+BS === OK
13177 UVA (3) //BS over answer == OK
http://codeforces.me/contest/801/problem/C (3) //BS + SUM -EASY
http://codeforces.me/contest/803/problem/D (3) //BS by answer
http://codeforces.me/contest/807/problem/C (3) //Or math
http://codeforces.me/contest/818/problem/F (4) //NICE — Live VS Clique
http://codeforces.me/contest/845/problem/E (5) //VERY NICE — min(X,Y) .. add time, repeat
http://www.spoj.com/problems/MATHLOVE/ (2) //BS + Gaus (or otter ways)
http://www.spoj.com/problems/SABBIRGAME/ (3) //Binary search over answer ::max(0,ANS)
http://codeforces.me/contest/846/problem/D (4) //BS+Precalculation OR 2D-RMQ
11659 UVA (4)
11535 UVA (4)
http://codeforces.me/contest/779/problem/E (5) //NICE + Parsing
http://www.spoj.com/problems/EC_CONB/ (1) //reverse numbers
http://codeforces.me/contest/769/problem/D (4) //freq + brute-force
http://www.spoj.com/problems/HAP01/ (2) //builtin_popcount
http://codeforces.me/contest/754/problem/E 6
http://www.spoj.com/problems/UCBINTC/ 5 //polymul with bitset
11439
http://codeforces.me/contest/732/problem/F 7
http://codeforces.me/contest/700/problem/C 7
http://www.spoj.com/problems/EC_P/ (3) //bridges ONLY
http://www.spoj.com/problems/SUBMERGE/ (3) //Direct articulation
http://www.spoj.com/problems/GRAFFDEF/ (5) //Bridge tree
UVA 12169 (2)
http://codeforces.me/contest/725/problem/C 4
http://codeforces.me/contest/725/problem/E 6
http://codeforces.me/contest/724/problem/B 3
11961 UVA (2)
11898 UVA (4)
11659 UVA (4)
http://codeforces.me/contest/753/problem/C 7
11699 UVA (4)
11548 UVA (3)
11471 UVA (5) //With dynamic programming
http://codeforces.me/contest/698/problem/D 8 //with geometry
11206 UVA (6) //4^20 (but somehow passes)
11214 UVA (6) //Úvaha + pruning
11127 UVA (4) //Simple dfs [just realize you can do so]
http://www.spoj.com/problems/BOKAM143SOU/ (3) //just implement for-cycles
http://www.spoj.com/problems/BLOPER/ (4) dfs with little pruning
13173 UVA (3) //just brute-force + branching
http://codeforces.me/contest/799/problem/D (4) //VERY NICE [only top 34 needed] — trick with 2 [~20]
10890 UVA (4) //Simple brute-force times out, but with simple pruning AC (answer detection
http://codeforces.me/contest/813/problem/B (3) //All*All (BF) care for overflow! NICE & EASY
http://codeforces.me/contest/817/problem/C (3) //Check S+Constant (NICE!)
10732 UVA (2) //Brute-force passes .. just don't trust them O(N^2)
10748 UVA (5) //VERY Nice (knights have K^2 moves not 8^K)
http://codeforces.me/contest/818/problem/D (4) //NICE for each 'A' check all remaining (max SQRT)
http://codeforces.me/contest/834/problem/E (5) //NICE — hard to imple: all 11122...999 OK
http://codeforces.me/contest/839/problem/E (5) //NICE! Max-Clique
http://www.spoj.com/problems/JHAGIRLS/ (4) //Efficient — or store output in array
http://codeforces.me/contest/846/problem/B (3) //Brute-force
http://www.spoj.com/problems/ALONE/ (4) //Generate everything <10^15 [NICE]
http://codeforces.me/contest/715/problem/C 9
http://codeforces.me/contest/741/problem/D 8
13164 UVA (7)
http://codeforces.me/contest/752/problem/F 5
http://codeforces.me/contest/766/problem/E 6
http://codeforces.me/contest/833/problem/D 7 //Very nice — hard (thinking + imple) + FW
http://codeforces.me/contest/741/problem/C 6
11331 UVA (4)
http://codeforces.me/contest/664/problem/D 4
12001 UVA (3)
12034 UVA (4)
11719 UVA (5)
11798 UVA (5)
11282 UVA (4) //dearrangement
11174 UVA (4)
http://codeforces.me/contest/666/problem/C 7
http://www.spoj.com/problems/JOKER1/ 3 prod(Ai-i)
http://www.spoj.com/problems/ANTP/ //4
http://codeforces.me/contest/645/problem/E (5) //formula: A[i]=Sum(A)+1
http://www.spoj.com/problems/SPCE/ (5) // N^{K-2}*Prod(comp_size)
http://codeforces.me/contest/785/problem/D (5) // F'(' C"(+)-1","("
13184 UVA (3)
http://codeforces.me/contest/816/problem/D (5) // Observation
13214 (4) //OEIS? : C(N+M-2,N-1)
http://codeforces.me/contest/844/problem/B (2) //Easy — pro prvaky
http://www.spoj.com/problems/JOSWAP/ (3) //Frequence array
http://www.spoj.com/problems/UCV2013E/ (4) //NICE&EASY: Choose steps to direction
http://www.spoj.com/problems/PARCARD1/ (4) //Partition function (raw)
http://www.spoj.com/problems/GOODB/ (2) //Easy (NICE): Choose [order]
http://www.spoj.com/problems/LOOPEXP/ (4) //A000254/N!
http://www.spoj.com/problems/DTPOLY/ (5) //DP might work too
http://www.spoj.com/problems/DTPOLY2/ (7) //Harder version of above (NICE but hell)
http://www.spoj.com/problems/HC12/ (3) //NICE — Sort + C(i,K-1)*A[i]
http://www.spoj.com/problems/STONE2/ (4) //NICE — Mostly DP [INVERSION][FACTORIAL]
http://codeforces.me/contest/802/problem/H (6) //We can do "N+k" by adding a letter p+k*x+u+xx
12186 UVA (3)
http://codeforces.me/contest/734/problem/E (5)
http://codeforces.me/contest/727/problem/A (3)
http://codeforces.me/contest/723/problem/E (6)
http://codeforces.me/contest/709/problem/E (6)
http://codeforces.me/contest/710/problem/E (4)
http://codeforces.me/contest/758/problem/E (8)
11323 UVA (5)
http://codeforces.me/contest/760/problem/B (3)
http://codeforces.me/contest/761/problem/E (6)
http://codeforces.me/contest/638/problem/B (3) //connect cons. letters
http://codeforces.me/contest/638/problem/C (4) //greedy idea — easy
http://codeforces.me/contest/638/problem/D (5) //spec-DAG articulatin
http://codeforces.me/contest/767/problem/C (4)
http://codeforces.me/contest/781/problem/C (5)
http://codeforces.me/contest/794/problem/D (5) //NICE! Right done dfs
http://codeforces.me/contest/802/problem/K (5) //Slightly DP-like (NICE) TREE
http://codeforces.me/contest/813/problem/C (3) //Simply 2 DFS: NICE + EASY
http://codeforces.me/contest/841/problem/D (4) //DFS while tracking "next"
http://codeforces.me/contest/845/problem/G (5) //Keep track of cycles
http://codeforces.me/contest/844/problem/E (5) //Post-Order → line, Connect i → N-2: star
http://www.spoj.com/problems/CAC/ (5) //VERY NICE! — Find all cycles in cactus
http://codeforces.me/contest/849/problem/C (3) //State search by gauss
http://codeforces.me/contest/846/problem/E (5) //NICE: DFS + some overflow logic
http://www.spoj.com/problems/KOZE/ (3) //NICE: Floods
http://www.spoj.com/problems/RIOI_2_3/ (4) //DFS /OR/ BFS /OR/ DSU [NICE][EASY][BF]
http://www.spoj.com/problems/MAKEMAZE/ (3) //EASY — Simple dfs on grid
http://www.spoj.com/problems/PR003004/ (4) //Simple digits count
http://codeforces.me/contest/770/problem/B (3) //max num max digsum
http://codeforces.me/contest/716/problem/D 7
12047 UVA 4
11514 UVA 4
http://codeforces.me/contest/757/problem/F 7
11338 UVA (4)
11374 UVA (4)
11097 UVA (4) //Divide to N*1000 nodes and go!
13172 UVA (5) //6*DJ per query + permutations
10816 UVA (4) //Easy Linear-Search by answer + DJ with path
http://codeforces.me/contest/827/problem/F 7 //Very nice — Even&Odd
http://codeforces.me/contest/817/problem/D (5) //Very nice NlogN
11552 UVA (3)
12172 UVA (3)
4507 LA (5)
4510 LA (5) [+ geometry]
12181 UVA (6)
http://codeforces.me/contest/729/problem/F 6
http://codeforces.me/contest/735/problem/E 9
http://codeforces.me/contest/731/problem/E 5
12030 UVA (4)
http://codeforces.me/contest/721/problem/E 7
http://codeforces.me/contest/742/problem/D 4
12040 UVA (5)
http://codeforces.me/contest/712/problem/D 5
13162 UVA (6)
http://codeforces.me/contest/743/problem/E 6
11908 UVA (3)
11932 UVA (4)
http://codeforces.me/contest/745/problem/E (7)
11806 UVA (4)
http://codeforces.me/contest/747/problem/F (5)
11843 UVA (4)
http://codeforces.me/contest/752/problem/E (5)
http://codeforces.me/contest/703/problem/E (7)
11753 UVA (4)
11725 UVA (5)
http://codeforces.me/contest/722/problem/E (9)
http://codeforces.me/contest/760/problem/F (8)
11795 UVA (3)
11654 UVA (4)
11523 UVA (5)
11404 UVA (4)
11432 UVA (4)
11451 UVA (4) //C==20 mistake in statement
11301 UVA (4)
http://codeforces.me/contest/762/problem/D 5
11361 UVA (4) //digit DP
11365 UVA (7)
11391 UVA (4) //easy+implementation
11394 UVA (3)
11218 UVA (2)
11125 UVA (4) //slightly implementation
11076 UVA (3)
11081 UVA (4) //3 string subsequences (beware of fail)
http://codeforces.me/contest/678/problem/E (5) //bitset dp + probability
http://codeforces.me/contest/766/problem/C (4)
http://codeforces.me/contest/667/problem/C (3)
http://www.spoj.com/problems/MOVIFAN/ (3)
http://www.spoj.com/problems/ORDSUM23/ (3)
http://www.spoj.com/problems/DIVSEQ/ (4) //N^3 (but better...) works fine
http://codeforces.me/contest/633/problem/F (7) //Tree dp
http://www.spoj.com/problems/ADJDUCKS/ (4) sort + pick 2-3 continous O(N)
http://www.spoj.com/problems/JLNT/ (4) //pick 0 or 2 | 1e3*5e3
http://www.spoj.com/problems/TPCPALIN/ (5) //500^3 works (3rd countable)
http://www.spoj.com/problems/COLORSEG/ (4) //50^4==OK 50^4log(N)=TLE NICE
http://www.spoj.com/problems/POWERCAR/ (3) //1e3*1e3*2 — follow rules
http://www.spoj.com/problems/INGRED/ (5) //TSP-like [reduce + go]
http://www.spoj.com/problems/BADXOR/ (4) //classical subsets
http://www.spoj.com/problems/SPCO/ (5) //64*64*2 DP {OPT: prime O(1) + clear only half}
http://www.spoj.com/problems/WAYHOME/ (5) //NICE: 1) 1*1 b)12,1,**,2
http://www.spoj.com/problems/NFURY/ (2) //Minimal sum of squares
http://www.spoj.com/problems/GDIL/ (3) //combinatorics
http://codeforces.me/contest/791/problem/D (5) //Tree
http://codeforces.me/contest/791/problem/E (6) //V,K,X — pick any
http://codeforces.me/contest/789/problem/C (3)
13176 (4) //N^6
13179 (5) //NICE [Ath][Bth][TimeDiff]
http://codeforces.me/contest/796/problem/E (6) //NICE: N*P*K*K (WC can't happen!)
http://codeforces.me/contest/797/problem/E (4) //NICE: Almost BF-able (but care of low K)
http://codeforces.me/contest/793/problem/D (3) //NICE & EASY: begin/end/actual/USED
http://codeforces.me/contest/803/problem/E (4) //State search — many IF's (EASY)
http://codeforces.me/contest/805/problem/F (7) //NICE: DP on tree + fast BF + hack
http://codeforces.me/contest/808/problem/E (5) //NICE!
http://codeforces.me/contest/811/problem/C (4) //Precalculate + DP (greedy thinking)
10817 UVA 4 //Easy but slightly implementation
10859 UVA 4 //Nice — on tree .. but for a reason small constrains
10898 UVA 4 //Hash is lesser than 1e6 .. try everything
http://codeforces.me/contest/812/problem/B (3) //Not only DP, yet imho easiest ..many spec cases
http://codeforces.me/contest/813/problem/D (5) //VERY VERY NICE — N*N (none picked between a/b)
http://codeforces.me/contest/814/problem/E 5 //VERY NICE — Harder imple: Combinatorics
http://codeforces.me/problemset/problem/816/E (6) //NICE — Tree (hard 2C complexity)
http://codeforces.me/contest/837/problem/D (5) //NICE — yet kinda pain [must be iterative]
http://www.spoj.com/problems/AUT/ (4) //NICE — K is interesting ~ at most 1600
http://www.spoj.com/problems/GNYR04C/ (3) //Easy — Nice idea [Big→ Low approach]
http://www.spoj.com/problems/TIEROPE/ (4) //Process 2*L ~ otherwise pick BIG
http://www.spoj.com/problems/IITKWPCE/ (4) //Palindromes [efficiency!] — NICE!
IITKWPCD SPOJ (4) //+Slightly geometry
http://www.spoj.com/problems/LKS/ (3) //Classical knapsack
http://www.spoj.com/problems/UOFTAE/ (3) //Easy & Sympatic DP
http://www.spoj.com/problems/DCOWS/ (4) //Very NICE (sort + GO)
http://www.spoj.com/problems/FARIDA/ (3) //Easy & Sympatic ((u+1) | Price+(u+2))
http://www.spoj.com/problems/AU7_5/ (2) //EASY: dyn(n-1)+dyn(n-k-1)
http://www.spoj.com/problems/NAIVELOK/ (4) //NICE [depalindromisation]
http://codeforces.me/contest/846/problem/C (4) //With print
http://www.spoj.com/problems/CNT_LUCK/ (4) //Number (binary) dp [NICE] {ull care 0-1}
http://www.spoj.com/problems/MAY99_4/ (3) //Almost combinatoric Sub and 0/1,1/0
http://www.spoj.com/problems/GEEKOUNT/ (4) //Number dp
http://www.spoj.com/problems/MUTDNA/ (4) // N*2 (turned?) [not sure if grd poss.]
http://www.spoj.com/problems/RIOI_3_2/ (5) //VERY NICE (easy imple — Number Theory thinking)
http://www.spoj.com/problems/MAXWOODS/ (3) //NICE [EASY][GRID]
http://www.spoj.com/problems/DIEHARD/ (3) //Easy — prolly solvable by greedy (but dp is easier)
http://www.spoj.com/problems/DCEPC810/ (4) //VERY VERY NICE — Subsequence 2pointers+2bools
http://www.spoj.com/problems/EQ2/ (4) //NICE: Digit + Carry (from back) — iff-party
http://codeforces.me/contest/723/problem/F 7
13153 UVA (5)
13169 UVA (3)
11987 UVA (3)
11474 UVA (4)
http://codeforces.me/contest/687/problem/D 6
http://codeforces.me/contest/680/problem/E 7 //+precalculation/brute force
http://codeforces.me/contest/766/problem/D 5
http://www.spoj.com/problems/LEXSTR/ (3) //Nice na stringu
http://codeforces.me/contest/805/problem/C 3 //NICE (dijkstra like :P)
http://www.spoj.com/problems/IITKWPCI/ (3) //VERY NICE
http://www.spoj.com/problems/FRNDCIRC (3) //Classical DSU (NICE for practice)
http://www.spoj.com/problems/FOXLINGS/ (3) Easy — just renumbering
http://www.spoj.com/problems/NITTROAD/ (4) //Process from back
http://www.spoj.com/problems/SHAHBG/ (2) //DSU not needes (simulated by array)
http://www.spoj.com/problems/NAJPWG/ 4 //Gauss-Euler
http://www.spoj.com/problems/DCEPC12G/ (5) //Do what is written there
http://www.spoj.com/problems/INVPHI/ (5) //Inverse euler
http://codeforces.me/contest/789/problem/D //Adj EG + Self/everything
http://codeforces.me/contest/747/problem/C 3
11776 UVA (3)
11134 UVA (3)
12005 UVA (7)
12062 UVA (6)
11960 UVA (3)
http://www.spoj.com/problems/FACTCG2/ (3)
http://www.spoj.com/problems/FACT0/ (4)
http://codeforces.me/contest/546/problem/D 5
http://codeforces.me/contest/222/problem/C 6
http://www.spoj.com/problems/COMDIV/ 3
http://www.spoj.com/problems/SINEGGS/ 3
http://www.spoj.com/problems/BDOI16B/ 4
http://www.spoj.com/problems/HG/ 4 //Map == OK
11099 UVA (3) //factor + recursion
13194 UVA (3) //factorize+generate /or just check
13191 UVA (6) //Pollard-Rho
http://codeforces.me/contest/818/problem/E (4) // Efficient + Two Pointers
http://codeforces.me/contest/831/problem/F (6) //MAGIC
http://codeforces.me/contest/839/problem/D (4) // Combinatorics + IE
http://www.spoj.com/problems/SAS002/ (5) //Find all divisors (big numbers)
http://www.spoj.com/problems/GCDS/ (4) //Lowest unused prime
http://www.spoj.com/problems/IITKWPCF/ (4) //Nonprime divisors of N/2
http://codeforces.me/contest/851/problem/D (4) //Properties of GCD + factor: NICE
http://www.spoj.com/problems/PTIME/ (3) //Low bounds — check each prime independently
http://codeforces.me/contest/707/problem/E 7 [2D]
http://codeforces.me/contest/749/problem/E 8
http://codeforces.me/problemset/gymProblem/101055/D 5 [2D]
11240 UVA (4)
http://codeforces.me/contest/669/problem/E 5 //fenwicks — sparse
http://codeforces.me/contest/777/problem/E 4 //MAXIMUM
http://www.spoj.com/problems/TULIPNUM/ 4 //inc — 1 nor+num|sum(A[B],A[E])
http://codeforces.me/contest/799/problem/C 3 //MAX FW (but possibly easier?)
http://codeforces.me/contest/831/problem/E 4 //MAP to get ORDER — FW == LIST
http://www.spoj.com/problems/SAS001/ (4) //Nice — number of inversions + 2P
http://www.spoj.com/problems/TPGA/ (4) //NICE — Lesser*(N-i-1)!
http://www.spoj.com/problems/SGIFT/ (4) //BS works too
http://www.spoj.com/problems/SUMSUM/ (5) //Bit-by-Bit cnt 0/1
http://www.spoj.com/problems/AKVQLD03/ (3) //Classical fenwick — easy
http://www.spoj.com/problems/ZIGZAG2/ (6) //Very nice — FW + BS + DP
http://codeforces.me/contest/849/problem/E (7) //2D Fenwick / ST+TP [NICE]
http://www.spoj.com/problems/CRAYON/ (5) //VERY NICE [2*FW — begin + end]
http://www.spoj.com/problems/NITT8/ (4) //Norm. + Store indices in MAX-Fenwick [REVERSE] [VERY NICE]
http://www.spoj.com/problems/DCEPC705/ (4) //NICE! Sort + Fenwick
http://www.spoj.com/problems/TSUM/ 5
13182 UVA 5 //ACTG hamming
http://codeforces.me/contest/827/problem/E (8) //MAGIC
http://www.spoj.com/problems/FASTFLOW/ 3 //simple flow
http://codeforces.me/contest/808/problem/F 6 //NICE — nontrivial (max matching with bigger flows)
13211 UVA (5) //NICE — FW adding states
http://www.spoj.com/problems/ROHAAN/ (3) //Classical
11859 UVA 4
11863 UVA 4
11892 UVA 3 //Probably solved by many
11534 UVA 5
http://www.spoj.com/problems/VECTAR11/ 4 //Nsqrt(N) passes [with break]
http://codeforces.me/contest/768/problem/E (4) //NICE — Grundy
http://www.spoj.com/problems/SYNC13C/ (4) //2*DP {maybe not seeing sth}
http://codeforces.me/contest/787/problem/C (4)
http://codeforces.me/contest/794/problem/C (3) //Find optimal strategy: choose back/front
http://codeforces.me/contest/794/problem/E (5) //NICE Find stategy: Even/Odd
http://codeforces.me/contest/812/problem/E (7) //Advanced NIM strategy
http://www.spoj.com/problems/GAMEMVS/ (4) //Nimbers (Ai^X)<=Ai
http://www.spoj.com/problems/PLAYGAME/ (3) //Check pattern
http://www.spoj.com/problems/CHAOS_CC/ (4) //VERY NICE [nimbers]
http://codeforces.me/contest/851/problem/E (5) //Very nice [nimbers] [bitset]
http://www.spoj.com/problems/CHGROOM/ (4) //+Factorisation [NICE & Easy]: Win unless 2 prime factors
12173 UVA 3
12194 UVA 4
11894 UVA 3
11769 UVA 7
11665 UVA 5
11509 UVA 4
11355 UVA 5
11265 UVA 6 //Nice one | polygon — cut/pt-check/area
11123 UVA 4 //Counting trapezoids
11177 UVA 6 //BS+Polygon/Circle intersection
11186 UVA 3
11008 UVA 5 //with DP → #intersected triangles
11012 UVA 5 //Nejvzdálenější body (Manhatton 3D)
11072 UVA 4 //Body v poly gonu
http://codeforces.me/problemset/problem/682/E 6 (biggest triangle)
http://codeforces.me/contest/672/problem/C 4 //easy — just think it up
http://codeforces.me/contest/667/problem/A 2 //vzorecky
http://codeforces.me/contest/793/problem/C 5 //EASY but beware of epsilons (NICE)
http://codeforces.me/contest/794/problem/B 2 //Can be done with BS
http://codeforces.me/contest/814/problem/D 5 //+DP on trees (NICE — but low geom.)
10750 UVA 3 //Closest points — try all pairs
http://codeforces.me/contest/820/problem/B 3 //Polygon angle find!
13213 UVA 5 //VERY NICE — Voronoi diagram (low constraints so not actually needed)
13215 UVA 3 //EASY — Sum areas and find side lengths
http://www.spoj.com/problems/IITKWPCC/ (5) //VERY VERY NICE — Nqrt(N)log(N)
http://www.spoj.com/problems/NNS/ (5) Closest points query [fake geometry] {__128}
http://codeforces.me/contest/849/problem/B (3) //X-Product — side
http://www.spoj.com/problems/AMR12C/ (5) //Point closest to all other points (with speed)
http://codeforces.me/contest/27/problem/D (5)
11387 (UVA) 4
http://www.spoj.com/problems/VFRIEND2/ (5) //Graph possible check
http://codeforces.me/contest/729/problem/D 3
http://codeforces.me/contest/729/problem/E 4
http://codeforces.me/contest/725/problem/D 4
http://codeforces.me/contest/725/problem/F 9
http://codeforces.me/contest/732/problem/E 5
http://codeforces.me/contest/727/problem/F 6
http://codeforces.me/contest/724/problem/D 5
http://codeforces.me/contest/723/problem/C 4
http://codeforces.me/contest/719/problem/B 2
http://codeforces.me/contest/712/problem/C 3
13152 UVA (4)
http://codeforces.me/contest/746/problem/E 5
http://codeforces.me/contest/746/problem/D 3
http://codeforces.me/contest/749/problem/C 3
11737 UVA (3)
11786 UVA (4)
11630 UVA (5)
11563 UVA (4)
11491 UVA (4)
11330 UVA (3)
11089 UVA (2)
http://www.spoj.com/problems/SQRMINSUM/ 3 //solve-able in O(N+M)-arrayqueue
http://www.spoj.com/problems/MSCHED/ 3 //sweep from back
http://www.spoj.com/status/ns=18780683 4 //all perm + A<B<C works
http://www.spoj.com/problems/NINJA7/ (3) //sort by diff
http://www.spoj.com/problems/NINJA2/ (4) //try all possib. (26)
http://codeforces.me/contest/767/problem/E (6)
http://codeforces.me/contest/637/problem/B (3) //NICE pro prvaky
http://codeforces.me/contest/777/problem/B (3) // -||-
http://codeforces.me/contest/777/problem/D (3) //just go from end
http://codeforces.me/contest/779/problem/C (3) //NICE pro prváky
http://www.spoj.com/problems/SPCU/ (2) //Easy — zamysleni (max int = index)
http://www.spoj.com/problems/LOPOV/ (4) //sort + queue (or just queue) NICE
http://codeforces.me/contest/792/problem/E (5) //T%S<=T/S + check proper
http://codeforces.me/contest/807/problem/E (5) //NICE — put asice P2 / rest — greedy from small
http://codeforces.me/contest/799/problem/E (5) //Many queues — but NICE
http://codeforces.me/contest/808/problem/C (3) //EASY
http://codeforces.me/contest/802/problem/B (4) //Priority by "next"
10850 UVA (4) //Queue a brute-force
http://codeforces.me/contest/813/problem/A (1) //Zahrivacka pro prvaky
10716 UVA (4) //NICE — always find closest pair
http://codeforces.me/contest/816/problem/C (3) //NICE — greater<lesser side
http://codeforces.me/contest/820/problem/D (5) //VERY NICE — O(N) -~- 5 events per number
http://codeforces.me/contest/818/problem/B (2) //Zahrivacka pro prvaky
http://codeforces.me/contest/822/problem/C (4) //Almost classical Sort+Queue
http://codeforces.me/contest/825/problem/C (2) //Nice & Easy
http://codeforces.me/contest/825/problem/D (3) //Update by modulo
http://codeforces.me/contest/835/problem/B (2) // Zahhrivacka pro prvaky
http://codeforces.me/contest/839/problem/B (3) //Nasty iffs — yet nice excersize
http://www.spoj.com/problems/PCPC12I/ (4) //Swipe MINIMUM from left/right [10^6-A[i] trick]
http://www.spoj.com/problems/AMR12I/ (3) //NICE a) MAX_SEG>=K b) (SEG_SIZE-1)/K+1
http://www.spoj.com/problems/BUSYMAN/ (2) //NICE&EASY — Sort + keep minimum
12012 UVA 4
http://codeforces.me/contest/727/problem/E 7
http://codeforces.me/contest/718/problem/D 8
11855 UVA 4
http://codeforces.me/contest/752/problem/D 5
http://codeforces.me/contest/825/problem/F 5 //String + Periods
http://codeforces.me/contest/835/problem/D 4 //Palindromes
11852 UVA (6)
http://www.spoj.com/problems/KLUG1/ (2) //Jumps of horse
http://codeforces.me/contest/719/problem/C 3
http://codeforces.me/contest/747/problem/E 4
http://codeforces.me/contest/754/problem/C 5
11482 UVA (4)
11291 UVA (3)
11070 UVA (5) //evaluation of expression
11074 UVA (2)
http://codeforces.me/contest/678/problem/B 2 //calendar days
http://codeforces.me/contest/643/problem/A 3 //easy — just simulate
http://codeforces.me/contest/770/problem/D 5 //easy — but pain — draw
http://codeforces.me/contest/789/problem/B 3 //simulate (mby twice)
13171 UVA (1)
10800 UVA (3)
http://codeforces.me/contest/828/problem/B 2 //EASY & NICE — just analysis
http://codeforces.me/contest/825/problem/B 2 //EASY & NICE — Piskvorky — pro prvaky
http://codeforces.me/contest/837/problem/B 2 //Just implementation
http://codeforces.me/contest/837/problem/C 2 //Some nasty iffs
http://codeforces.me/contest/845/problem/B 2 //Easy pro prvaky
http://codeforces.me/contest/845/problem/D 3 //Iffs — folow the rules
http://www.spoj.com/problems/UNIHW/ 4 //NICE (but many iffs)
http://www.spoj.com/problems/KPRIMESB/ (4)
http://www.spoj.com/problems/IITKWPCH/ (4) //NICE — on bits
http://www.spoj.com/problems/SUBSET/ (5) //VERY NICE — 3^10 (^2 but not exactly) (+ sorting)
http://codeforces.me/contest/727/problem/C (2)
http://codeforces.me/contest/810/problem/D (4) //BS * 3 (same)
http://codeforces.me/contest/811/problem/D (4) //BFS — easy .. some ifs
http://codeforces.me/contest/835/problem/E (4) //NICE! Bitsets + Detect + XOR
http://codeforces.me/contest/844/problem/D (5) //NICE! Randomized algo
11351 UVA (2)
http://www.spoj.com/problems/CLSLDR/ (4) //Muchas queries — go DP
http://www.spoj.com/problems/NAJPF/ (4) //classical kmp — all patterns
http://codeforces.me/contest/808/problem/G (6) //with DP -harder
http://codeforces.me/contest/733/problem/F 7
11354 UVA (4)
http://www.spoj.com/problems/POLICEMEN/ (3) //simple + small graph
http://www.spoj.com/problems/QTREE2/ (5) //very easy if bin. understrood
http://codeforces.me/contest/828/problem/F 7 // Differently MST / Outside
http://codeforces.me/contest/832/problem/D (5) //Classical + Depth /OR/ HLD +ST
http://www.spoj.com/problems/DRTREE/ (5) //NICE [finding ancestor + depths]
http://codeforces.me/problemset/problem/838/B (6) //VERY NICE [HLD + ET + ST]
http://www.spoj.com/problems/NTICKETS/ (4) //Maximum on path
http://www.spoj.com/problems/GRASSPLA/ (5) //HLD
10949 UVA (6) — Hunt or Bit
http://www.spoj.com/problems/MC/ (3) //Classical
http://www.spoj.com/status/ns=20097091 (4) //Permutation
http://www.spoj.com/problems/LCS0/ (7) //Bit
http://www.spoj.com/problems/ALTSEQ/ 3 //solvable by FW in Nlog(N)
http://www.spoj.com/problems/VISIBLEBOX/ (4) //with multiset
http://www.spoj.com/problems/DOSA/ (5)
http://www.spoj.com/problems/CODERE3/ 3 //Low bounds LIS/LDS
http://www.spoj.com/problems/BRDGHRD/ 4 //lis (nondecreasing)
http://codeforces.me/contest/727/problem/D 4
11985 UVA (5)
http://www.spoj.com/problems/AMR12A/ (5) //VERY NICE goophers + bonus
http://www.spoj.com/problems/NITT4/ (4) //VERY NICE [Chessboard matching]
12045 UVA (4)
11551 UVA (4)
11486 UVA (5)
10743 UVA (5) //A001169 [easy multi / hard to come with recurence]
http://codeforces.me/contest/821/problem/E (6) //Not trivial to come-up with matrix
http://www.spoj.com/problems/DCEPCA06/ (4) //NICE — 10x10 matrix
http://www.spoj.com/problems/GSWORDS/ (3) //NICE&EASY — 3-states "OO,OX,XO"
11613 UVA (6)
http://codeforces.me/contest/802/problem/C (8) //Nice but hard to see + negative
http://codeforces.me/contest/802/problem/N (5) //Easy but faster MCMF needed
http://codeforces.me/contest/818/problem/G (6) //NICE + MUCH Faster MCMF
http://www.spoj.com/problems/BNMT/ (7) //VERY NICE (some optimalisations needed + weird data set)
http://codeforces.me/contest/713/problem/C 7
http://www.spoj.com/problems/RMID2/ 4
http://www.spoj.com/problems/RMID/ 3 (as above just not so dynamic)
http://www.spoj.com/problems/EC_ESTA/ 4 //classical dynamic median
http://www.spoj.com/problems/DCEPCA09/ (6) //VERY NICE [MO +++ MEDIAN, MEAN, FREQ]
11851 UVA (5)
11465 UVA (5)
13207 UVA (4) //Straight-forward MIM
http://www.spoj.com/problems/COLOR_CC/ (4) //VERY NICE — div by partity (take lesser) → 8^6
http://www.spoj.com/problems/COT/ (7) //ON TREE [but very tight TLE]
http://www.spoj.com/problems/GOT/ (5) //ON TREE
http://www.spoj.com/problems/CPAIR2/ (4) //MO + Fenwick [VERY NICE]
12192 UVA 5
http://codeforces.me/contest/729/problem/B 2
http://codeforces.me/contest/710/problem/C 4
11871 UVA 6
11617 UVA (3)
11573 UVA (4)
11499 UVA (5)
11230 UVA (4)
http://codeforces.me/contest/731/problem/F 4
12031 UVA (8)
http://codeforces.me/contest/722/problem/F (8)
http://codeforces.me/contest/716/problem/C 4
http://codeforces.me/contest/711/problem/E (8)
http://codeforces.me/contest/710/problem/D (6)
13154 (UVA) 7
13166 (UVA) 5
11962 (UVA) 2
11718 UVA 3
11510 UVA (5)
11538 UVA (3) //good one — just math
11556 UVA (1)
http://codeforces.me/contest/757/problem/E (8)
http://codeforces.me/contest/758/problem/F (7)
11481 UVA (4)
11237 UVA (4) //Nice — seems like knapsbag but it it not
11155 UVA (4) //Almost as previous problem
11038 UVA (3) //counting digits on interval
http://codeforces.me/contest/763/problem/C (7)
11087 UVA (4) //Sums of two numbers divisible with <=500 (10^5)
http://codeforces.me/contest/678/problem/C 2 //LCM
http://codeforces.me/problemset/problem/665/F (8) //p^3 | p*q
http://www.spoj.com/problems/LCMSUM/ //Vzorec v knihovničce
http://www.spoj.com/problems/FRNDZND/ (2) // (size 1 == 1, else 0)
http://www.spoj.com/problems/EXPOR/ //bit-by-bit (+ formula)
http://www.spoj.com/problems/FACTDIV/ (5) //dyn-update of ans/factors GOOD
http://www.spoj.com/problems/PAIRDIV/ (6) //cyka möbius -_-
http://www.spoj.com/problems/FCDC/ (4) //keep factorized factorial
http://www.spoj.com/problems/NTHPRIME/ (7) // BS + NumPrime GOOD!!
http://www.spoj.com/problems/DIVFACT3/ (7) // Sieve 10^8 + sqrt search
http://www.spoj.com/problems/DIVFACT4/ (8) // Prime count
http://codeforces.me/contest/776/problem/C (4) //segments div. by number
http://codeforces.me/contest/776/problem/E (6) //vypsat cisla: f(N)=Phi(N),g(N)=N
http://www.spoj.com/problems/PHT/ (2) //easy BS (NN+2N) mby math?
http://www.spoj.com/problems/GCDEX/ (7) //OEIS A006579 — enough [well imp]
http://www.spoj.com/problems/APS/ (3) //just sieve + generate
http://www.spoj.com/problems/WPC5I/ (3)//fc: C[a]!=C[b]:F[a]^max(C[a],C[b])
http://www.spoj.com/problems/SPEC_SET/ N→N/k→N/k/k
http://www.spoj.com/problems/DCEPC11B/ (5) //Wilson't theorem!
http://www.spoj.com/problems/FACTMULN/ (5) //each f[i]/c[i] separately
http://www.spoj.com/problems/SPCM/ (4) //just factorisation + prime check (10^12)
http://www.spoj.com/problems/TWOGAME/ (5) //gcd == Power of 3 => YES
http://www.spoj.com/problems/MKEQUAL/ (2) //Chceck if sum is divisible by N
http://www.spoj.com/problems/TIPTOP/ (3) //sqrt(N)==N? NICE!!
http://www.spoj.com/problems/PSYCHON/ (4) // fast factorisation
http://www.spoj.com/problems/ENIGMATH/ (1) // swap and div by gcd
http://www.spoj.com/problems/SNGPG/ (3) // prime gen + check
http://codeforces.me/contest/795/problem/A (2) //brute-force
http://codeforces.me/contest/801/problem/E (6) //NICE! — Clique-DAG + inversion
http://codeforces.me/contest/798/problem/C (4) //GCD == at the beginning OR 2
http://codeforces.me/contest/803/problem/C (3) //Only "low" K and just divisors
10830 (4) //simple add 2→ sqrt(N) + their mirrors
http://codeforces.me/contest/817/problem/A (2) //check division + parity
13209 UVA (3) //Simple simulation of division (+states rememberance)
http://codeforces.me/contest/834/problem/C (4) //Has cube-root + both num divisible by cuberoot
http://codeforces.me/contest/837/problem/E (5) //Factorisation + GCD attributes
http://www.spoj.com/problems/SUMMATION/ (3) //Number contribution: 2^(N-1)
http://www.spoj.com/problems/SECTORS/ (4) //Odd len OR sum of odd indices == sum of even
http://www.spoj.com/problems/IITKWPCM/ (6) //VERY NICE — Gauss's generalisation of Wilsons Theorem
http://www.spoj.com/problems/UCV2013A/ (4) //N*(N^L-1)/(N-1)
http://www.spoj.com/problems/KIMO1/ (4) //NICE — Adding/Subing by modulus
http://www.spoj.com/problems/AFS2/ (4) //Sum of divisort (sqrt(N)) — (+128int)
http://www.spoj.com/problems/FUNNUMS/ (4) //Permutations (get ith + guess ith)
http://www.spoj.com/problems/MAY99_3/ (3) //GCD
http://www.spoj.com/problems/PUCMM334/ (3) //Classical hats problem
http://www.spoj.com/problems/LCPC11B/ (4) //Factorize + count all subsets
http://www.spoj.com/problems/THREENUMBERS/ (2) //EASY & NICE [lcm]
http://www.spoj.com/problems/GAMES/ (2) //EASY&NICE — Go discrete (by 10^k) → 10^k/GCD
http://www.spoj.com/problems/SUBSHARD/ (4) //dig*10^sufix*(choose sufix)*^Prefix [VERY NICE]
http://www.spoj.com/problems/INVDIV/ (6) //Sum of divisors function + factorisation [NICE]
http://www.spoj.com/problems/JNEXT/ (2) //EASY — Zahřívačka pro prváky
12004 UVA 2
11273 UVA 5 //https://oeis.org/A001088
11077 UVA 3 //https://oeis.org/A094638
http://www.spoj.com/problems/VECTAR5/ 3 //https://oeis.org/A038721
http://www.spoj.com/problems/ESYRCRTN/ 2 //generate and see
http://www.spoj.com/problems/IITWPC4B/ 3 //http://oeis.org/A005044
http://www.spoj.com/problems/POLCONST/ (4) //A003401+Fermat Number (Prime)
http://www.spoj.com/problems/CUTCAKE/ (3) // pattern [1 22 333 4444 55555]
10872 UVA 3 //Alcuin's Sequence
http://www.spoj.com/problems/LOVINGPW/ (3) //A000788
http://www.spoj.com/problems/CBANK/ (3) //A000292 Tetrahedral numbers
http://www.spoj.com/problems/GUMATH2/ (4) //A000240 Modulo by MOD*2
http://www.spoj.com/problems/MATHII/ (4) //A006218 (Two formulas => sqrt(N))
11266 UVA (6) //slightly knapsack || moc hezka
http://codeforces.me/contest/761/problem/F (7)
http://www.spoj.com/problems/UPDATEIT/ (2) //basic method
13189 UVA (4) //simulation + sort queries
http://www.spoj.com/problems/MSUBSTR/ (4) //Simple manacher (or other)
1) Big Integer: https://a2oj.com/standings?ID=29173
2) Sieve: https://a2oj.com/standings?ID=29311
3) Factorisation: https://a2oj.com/standings?ID=29497
4) Power: https://a2oj.com/standings?ID=29722
5) Inversion: http://pastebin.com/Fk1PBMQ2
6) Matrix Exponentiation: https://a2oj.com/contest?ID=29975
7) Primality Testing: https://a2oj.com/contest?ID=30152
8) XOR TRIE: http://pastebin.com/w9Xfwf0h
9) Point in Polygon: https://a2oj.com/contest?ID=30414
10)Bridges & Articulations: https://a2oj.com/contest?ID=31087
11)Dijkstra: https://a2oj.com/contest?ID=31537
12)Belman-Ford: https://a2oj.com/contest?ID=31786
13)FW: https://a2oj.com/contest?ID=31812
14)Kruskal: https://a2oj.com/contest?ID=32579
15)LCA: https://a2oj.com/contest?ID=32584
16)Fenwick: https://a2oj.com/edit?ID=32669
17)DFS: https://a2oj.com/contest?ID=32968
18)Segment Tree: https://a2oj.com/edit?ID=33052
11019 UVA (5)
http://codeforces.me/contest/844/problem/C 3 //NICE Permutations in array
http://codeforces.me/contest/813/problem/E (6) //Easy but hard data structure
http://www.spoj.com/problems/ETF/ 3
http://www.spoj.com/problems/TIP1/ (4) //Phi + perms
http://www.spoj.com/problems/DCEPCA03/ (3) //Phi + Reduce cycles: P*PrevixP*2-P^2
http://www.spoj.com/problems/PUCMMT02/ (7) //wrong bounds- but ll OK
11029 UVA (3)
http://codeforces.me/contest/777/problem/C (4) //NICE
http://codeforces.me/contest/818/problem/C (4) //Prefix Sum
http://codeforces.me/contest/834/problem/B (2) //26 queries — NICE rozehrivacka pro prvaky
http://www.spoj.com/problems/RANGESUM/ (4) //NICE: Offline (delta) + Prefix Sum
http://www.spoj.com/problems/RANDG/ (3) //NICE [but too low bounds] [PrefixSum] [Try all indexes]
http://www.spoj.com/problems/HARSHAD/ (3) //Sieve + simple function
http://www.spoj.com/problems/PUCMM210/ (3) //Number theory (thinking not necessary)
http://www.spoj.com/problems/ABA12A/ (3)
10871 UVA (3) //Easy — fermat not necessary
http://www.spoj.com/problems/POP1/ (4) //Fast primality testing (or somehow)
http://www.spoj.com/problems/POP2/ (5) //NICE — same as above (yet with ll)
http://www.spoj.com/problems/POP3/ (6) //same as above (yet with big)
13190 UVA (2) //just priority queue
11762 UVA (5)
11427 UVA (5)
11348 UVA (2)
http://codeforces.me/contest/768/problem/D (4) //With DP
http://www.spoj.com/problems/IITWPC4J/ (4) //with DP
10828 UVA (5) //Nice problem but bad statemend: Expected value of visits MC
10777 UVA (4) //NICE — yet solvable with DP
http://codeforces.me/contest/839/problem/C (3) //NICE & Easy => Tree
http://www.spoj.com/problems/ZCR/ (3) //Easy (+DP)
http://www.spoj.com/problems/IITKWPCN/ (2) //Easy — Odd/Eve (black balls)
http://codeforces.me/contest/846/problem/F (5) // Expected number of unique elements
http://www.spoj.com/problems/GOC11A/ 4
13170 UVA (7) //heavy implementation — but NICE!
10854 UVA (3) //if/else
http://codeforces.me/contest/713/problem/D 6
http://codeforces.me/contest/675/problem/E 5
http://www.spoj.com/problems/POSTERIN/ 5 //VERY NICE — Delete all minimas
http://www.spoj.com/problems/RPLN/ (3) //RMQ only
http://www.spoj.com/problems/CITY2/ (4) //RMQ + MAP [NICE][VAGUE STATEMENT]
http://www.spoj.com/problems/AROPE/ 4
http://www.spoj.com/problems/AROPE2/ 5 //same as above (+time)
http://www.spoj.com/problems/TFRIENDS/ (4) //just scc size
http://codeforces.me/contest/739/problem/C (8)
http://codeforces.me/contest/718/problem/C (8)
http://codeforces.me/contest/750/problem/E (7)
http://codeforces.me/contest/759/problem/C (7)
11165 UVA (5)
http://codeforces.me/contest/763/problem/E (8) //VERY NICE — [non-trivial]
http://www.spoj.com/problems/BGSHOOT/ (5) //normalize — then easy
http://www.spoj.com/problems/KGSS/ (4)
http://codeforces.me/contest/765/problem/F (7) //VERY NICE — CASCADE
http://www.spoj.com/problems/GSS1/ (5) //Idea — then easy
http://www.spoj.com/problems/KQUERYO/ (5) //Seg-tree of vectors
http://codeforces.me/contest/633/problem/G (8) //EulerTree+Seg+Bitset
http://www.spoj.com/problems/NAJ0001/ (7) //10^8 int — memory (and worked)
http://www.spoj.com/problems/PRMQUER/ (5) //2 segment trees + sieve
http://www.spoj.com/problems/EC_DIVS/ (5) //dunno if intended
http://www.spoj.com/problems/DCEPC11I/ (5) //NICE — 1,2,3,4,5,.. inc
http://www.spoj.com/problems/QUE2/ (4) //kth number
http://codeforces.me/contest/785/problem/E (6) //Seg+Treap [and faster]
http://codeforces.me/contest/786/problem/B (6) //+Dijkstra
13183 UVA (6) //Merge-Sort-Tree [dunno]
http://codeforces.me/contest/803/problem/G (5) //VERY NICE!! — ST 10^9 + ST/RMQ 10^5
http://codeforces.me/contest/794/problem/F (7) //Digit by digit! (N*log(N)*100 )
http://codeforces.me/contest/811/problem/E (6) //VERY NICE — DSU (easier Timofey + animals)
http://codeforces.me/contest/817/problem/F (7) //10^18 + MEX ~~ NICE yet problematic
http://codeforces.me/contest/816/problem/B (3) //Or offline trick makes it easier
http://codeforces.me/contest/834/problem/D (5) //+Dynamic Programming | NICE
http://www.spoj.com/problems/SBO/ (5) //preLast→ last (-1), last→ now (+1) — VERY NICE
http://www.spoj.com/problems/GOODE/ (5) //NICE: Inversion + L-Mex
http://www.spoj.com/problems/CNTPRIME/ (3) //ST+Sieve (short range)
http://www.spoj.com/problems/SEGSQRSS/ (4) //NICE {weak data} ~~ SQRT works too
11885 UVA 7 //Previous problem requested for statement
11522 UVA 3 //Trick — low numbers only :P
11610 UVA (5)
11353 UVA (3)
http://www.spoj.com/problems/TDPRIMES/ (4)
http://www.spoj.com/problems/VECTAR8/ (3)
http://www.spoj.com/problems/NFACTOR/ (4)
http://www.spoj.com/problems/HS08PAUL/ (4) //simply generate
http://codeforces.me/contest/776/problem/B (3) //Easy — trict: PM-1/ELSE-2
http://www.spoj.com/problems/GGD/ (4) // N/lowestDiv*(lowestDiv-1)
http://codeforces.me/contest/822/problem/D (4) //DP + Lowest factor
http://www.spoj.com/problems/NGIRL/ (4) //Squares — Primes + BS == Easiest
http://www.spoj.com/problems/PTRI/ (5) //Very fast sieve necessary:/
http://www.spoj.com/problems/AFS/ (3) //Sum of divisort + DP
http://www.spoj.com/problems/BSPRIME/ (4) //Very fast sieve needed
12187 UVA (2)
http://codeforces.me/contest/724/problem/C 5
http://codeforces.me/contest/746/problem/C 3
11093 UVA (2)
http://codeforces.me/contest/768/problem/C (4)
http://www.spoj.com/problems/WRONG/ (5) //VERY NICE — precalculate from back, then go from front
12189 UVA (3)
12196 UVA (4)
http://codeforces.me/contest/731/problem/D 7
11925 UVA (4)
11979 UVA (3)
http://codeforces.me/contest/747/problem/D (4)
11890 UVA (4)
http://www.spoj.com/problems/KAOS/ (4) //pocet inverzí — GOOD problem!!!!
http://www.spoj.com/problems/KSMALL/ (5) //fast sort /or/ quick-select
http://www.spoj.com/problems/RKS/ (3) //use map
http://www.spoj.com/problems/SPCJ/ (4) //reverse + go from back
http://codeforces.me/contest/785/problem/B (2) //last-first + vice versa
http://codeforces.me/contest/798/problem/D (4) //Take 1st then take best B of every pair (sort by A)
http://codeforces.me/contest/810/problem/B (2)
http://codeforces.me/contest/810/problem/C (3) //+Math
http://codeforces.me/contest/814/problem/A (1) //Pro prváky — but nice observation
http://codeforces.me/contest/817/problem/B (3) //Frequency of TOP 3
10769 UVA (3) //Sadly N^4 passes
13208 UVA (4) //Sort + Prefix Sum
13212 UVA (3) //Number of inversions
http://codeforces.me/contest/831/problem/C (3) //NICE ~ Check all "add" against first
http://codeforces.me/contest/831/problem/D (4) //Can be solved with BS+Max-Match
http://codeforces.me/contest/841/problem/C (3) //NICE — match greatest to lowest
http://codeforces.me/contest/845/problem/C (2) //EASY — pro prvaky
http://www.spoj.com/problems/HSHW/ (4) //Test every big/low pair + big/big low/low on +/-
BLINNET SPOJ (3)
11183 UVA (4) //Directed [need to know algo!]
http://www.spoj.com/problems/ULM09/ (3) //Sum-Kruskal
http://www.spoj.com/problems/IITKWPCG/ (4) //VERY NICE [log instead of price]
11478 UVA (5)
12003 UVA 7
11990 UVA (5)
http://www.spoj.com/problems/GIVEAWAY/ (7) //SQRT + BS > [or Seg+Trie]
http://codeforces.me/contest/786/problem/C (5) //Nsqrn (bg) + sqrSegs (end)
http://codeforces.me/contest/840/problem/D (5) //NICE — Either frequent OR brute-force
http://codeforces.me/contest/799/problem/B (2) //EASY — MAP
http://codeforces.me/contest/808/problem/D (3) //MAP
10887 (2) //string + map
10730 (3) //Easy with hash-map
http://codeforces.me/contest/821/problem/C (3) //STACK (vector) Nice+Easy
http://www.spoj.com/problems/SOLVEIT/ (3) //Set + lower_bound
http://www.spoj.com/problems/IITKWPCA/ (2) //Set + getline
http://codeforces.me/contest/849/problem/D (5) //Queue
http://www.spoj.com/problems/CRAN02/ (4) //Map (+Math)
http://www.spoj.com/problems/MAX_NUM/ (4) //Queue (possibly multiple ways)
http://www.spoj.com/problems/SID/ (5) //Sort + Vector (or similar) [strict TLE]
http://codeforces.me/contest/762/problem/C 5
http://www.spoj.com/problems/LCS0/ 10 //LCS
http://www.spoj.com/problems/IITWPC4H/ 2 //Frequence array
http://www.spoj.com/problems/ANAGR/ 2 //frequency + palindromes
13186 UVA (6) //Bitset + Trie ~ NICE [6-7 mby?]
http://codeforces.me/contest/798/problem/B (2) //Brute-force .. pro prváky
10745 UVA (4) //Frequency (N^2 possible if efficient!!)
http://codeforces.me/contest/822/problem/B (2) //Easy pro prvaky (slightly imple.)
http://codeforces.me/contest/828/problem/C (4) //+Sorting (process only necessary!)
http://codeforces.me/contest/832/problem/B (3) //Naive compare back+front [+freq]
http://www.spoj.com/problems/STC04/ (5) //Next + pairs O(N*26) [frist look O(26^2*N)]
http://www.spoj.com/problems/IITKWPCJ/ (4) //GCD or HASHING
http://www.spoj.com/problems/SUBSN/ (4) //Next (NICE — bad input):
http://www.spoj.com/problems/AMR12D/ (1) //Palindrome check //Zahrivacka pro prvaky
http://www.spoj.com/problems/BOGGLE/ (2) //EASY [MAP][STREAM]
12191 UVA 5
SARRAY SPOJ 3
4513 LA 6
http://www.spoj.com/problems/LCS2/ 7 // must be linear (SA+LCP+MQ)
http://codeforces.me/contest/802/problem/I 7 //NICE! SA+LCP+(Segmentree/queue)
12048 UVA (5)
12197 UVA (4)
aho
bfs
bfs-grid
big
binary_search
bits
bitset
blossom
bridges
brute-force
centroid
coloring
combinatorics
constructive
dfs
digits
dijkstra
divide_conquer
dp
dsu
euler_function
euler_tour
events
factorization
fenwick
fft
flow
floyd-warshall
game_theory
geometry
graph
greedy
hash
hull
chess
implementation
inclusion-exclusion
interactive
josephus
KMP
lca
lcs_subsequence
lis
matching
matrix
matrix_exponentiation
mcmf
median
meet_in_middle
MO
number_rectangle
number_theory
oeis
offline
palindromes
PAST_CONTESTS
patter-matching
permutations
persistent_segment_tree
phi
pollard-rho
power
preprocess
prime-testing
priority_queue
probability
recursion
RMQ
rope
scc
segment_tree
sequences
sieve
simulation
sorting
spanning_tree
spfa
sqrt
stl
strings
suffix_array
sweep
ternary_search
TMP
topo
treap
tree
trie_bit
trie_string
TSP
two-pointers
z-function
100000
2SAT
http://codeforces.me/contest/765/problem/E 5
http://codeforces.me/contest/770/problem/C 4 //reduce + toposort
http://codeforces.me/contest/825/problem/E 4 //Toposort from biggest/backward
http://codeforces.me/contest/762/problem/E 6
http://www.spoj.com/problems/COUNT1IT/ 5
http://www.spoj.com/problems/IITWPC4D/ 4 //From end — pick i-th + del i-th
http://www.spoj.com/problems/ALLIN1/ 4 //Typical treap operations
http://codeforces.me/contest/746/problem/G 5
http://codeforces.me/contest/750/problem/F 9
http://www.spoj.com/problems/RTREE/ 3 //longest path tree — query
13175 UVA (2) //something like preorder build
http://codeforces.me/contest/796/problem/C (3) //Just counting — inc by at most 2
http://codeforces.me/contest/797/problem/D (4) //VERY NICE — sort + D&C all
http://codeforces.me/contest/805/problem/E (4) //NICE — Treewidth coloring (greedy)
http://codeforces.me/contest/828/problem/D (3) //Star construction
http://www.spoj.com/problems/TREEDEGREE/ (3) //Degree from euler tree
http://www.spoj.com/problems/UCV2013J/ (3) //Find what is leaf in Binary Tree
http://codeforces.me/contest/714/problem/C 5
http://www.spoj.com/problems/SUBXOR/ (4)
http://codeforces.me/contest/817/problem/E (5) //Classical — remember sum! NICE!
11732 UVA (5)
11539 UVA (5)
11488 UVA (4)
http://www.spoj.com/problems/TRYCOMP/ (4)
10860 UVA (4) //DP + Trie [nice — slightly generic]
10937 UVA (4) //find '!' / BFS / TSP — NICE!
10944 UVA (4)
10818 UVA (5) //Easy — but not-easy implementation: ++Dijkstra [LEX!]
http://www.spoj.com/problems/A_W_S_N/ (4) //BFS + TSP (path) — NICE
http://codeforces.me/contest/746/problem/F 6
11436 UVA (5)
http://codeforces.me/contest/760/problem/D 4
11386 UVA (4)
http://www.spoj.com/problems/WOWSUBSTR2/ 3
http://www.spoj.com/problems/ARRAYSUB/ 4
http://www.spoj.com/problems/CODFURY/ 3 //easy — ukazkove
http://codeforces.me/contest/769/problem/B 3 //sort + TP
http://codeforces.me/contest/814/problem/C 4 //NICE — maybe some DP +/-
http://www.spoj.com/problems/CRAN04/ 4 //NICE — (more or less) 3 pointers
http://www.spoj.com/problems/OPCPIZZA/ 3 //NICE [EASY] [AGAINS EACH OTHER]
http://www.spoj.com/problems/SUFEQPRE/ 4
12174 UVA (4)
http://www.spoj.com/problems/LCPC12F/ (2) //EASY — Little number theory
11930 UVA (4)
http://codeforces.me/contest/776/problem/D (5)
MINE problems [SPOJ] — I cn also mke some outline in case of interest:
ADARAIN ADACYCLE ADARAINB ADANUM ADAUNIQ ADASEED ADAGROW
ADAPLUS ADAFENCE ADAORANG ADACAROT ADAVISIT ADAPARTY ADABLOOM
ADAPLANT ADALIST ADASEA ADACABAA ADATOMAT ADAPARTI ADAPHOTO
ADATEAMS ADAPATH ADAHW ADASALES ADABERRY ADACON ADASUM
ADAINDEX ADACITY ADACOINS ADAPICK ADAROBOT ADATAXES ADABASH
ADAQUEUE ADAGAME2 ADADUNG ADAPEAR ADAZOO ADAGF ADAROADS
ADAGAME ADATRIP ADAMONEY ADAAPPLE ADAPOWER ADACHERY ADAKOHL
ADACLEAN ADAMATCH ADABEHIVE ADAAPHID ADAGIFT ADAPANEL ADACROP
ADAFIELD ADAHACK ADAGCD ADABASET ADACROW ADALICI
Sorry for the long post, here is a potato
Good luck,
Have nice day! ^_^
Thanks a lot -Morass- for your hard work.
It'd be great if you could use spoiler tag.
(I've let there be just a single list) [some spam charges] :P
(I've let there be just a single list) [some spam charges] :P
OMG ! This is something like, I wanted a bicycle and got an airplane. :)
I really didn't expect that. This is huge <3
Actually I wanted to say you might use spoiler tag to make it easier to read the problems. Like:
Problem 1
Problem 2
Problem 1
Problem 2
Problem 1
Problem 2
Problem 1
Problem 2
Problem 1
Problem 2
etc.
(I've let there be just a single list) [some spam charges] :P
Exactly <3
So, can you please edit your first two replies ? Please only keep the last reply only.
Since comment can not be deleted, you can just replace your first two replies by any single word.
Good day to you, Oka, I've made it one list — hope it is OK like this?! :O Have nice day!
Yea, I'd appreciate as well if you could leave only spoilered version (third comment), because the list is really amazing but first two comments make it hard to read :|
Good day to you,
Oka, I've made it one list — hope it is OK like this?! :O
Have nice day!
Hell yeah, great!
Hey Morass, are u the person who contributed lots of test cases in udebug and saved a lots of people?!!!
Hi Do both of your comments contain exactly the same problem?! Also,thanks for the great help,beginners like me benifit a lot..
Good day tou you,
well yes, just in different "format" [unless those two middle comments with "hints", those two commenst shall be one]
Have nice day ^_^
I seriously think you should get a thousand upvotes for your effort. :)
Wow! Awesome effort! This is what makes the programming community so great!
Just a thing, I can't access the problem of "Aho Corasick + DP" problem in SPOJ. It just takes me to the status page. Can you edit it?
Good day to you,
yes you are right — it shall be this link
sorry ^_^
Good Luck!
thanks mate! ^_^ you are simply awesome! :D
comfi asked me to update (somehow) Flows — so I thought I would post it here. It is in similar manner, yet there are not only recent problems.
I included all problems I solved (or someone) by Max-Flows (or similar topic). Anyway I don't claim it is the only way (many problems might have better/easier solutions).
I thought this list might come to use (to all — not just to comfi :P ) so here it is:
http://www.spoj.com/problems/FASTFLOW/en/ //Raw (no sauce)
4322 — Destroying the bus stations (Live Archive)
11380 — Down Went The Titanic (UVA) //Interesting grid problem
6395 — Surely You Congest (LA) //VERY NICE [slightly advanced]
7204 — Blood groups (LA)
http://codeforces.me/gym/100963 (Flame of Nucleus — F)
11167 — Monkeys in the Emei Mountain //Also harder (imho)
http://codeforces.me/problemset/problem/808/F (+BS)
http://codeforces.me/problemset/problem/653/D (+BS)
13000 — VIP Treatment (+BS)
1242 — Necklace
https://www.deadline24.pl/assets/problemsets/dl24.elim.2017.B.en.pdf (DEADLINE 24 problem — not sure if it can be submited :O)
3487 — Duopoly (Near matching)
http://codeforces.me/problemset/problem/847/J //Not sure if matching is right solutions but it works [also very near to matching]
http://codeforces.me/problemset/problem/727/D
http://codeforces.me/problemset/problem/704/D [Also advanced]
5418 — A Plug for UNIX (LA)
4957 — Fake scoreboard (LA) //If I remember well, other solutions was also possible
1155 — Power Transmission (LOJ) //(classical)
https://www.codechef.com/problems/ROBOTDAG //Ford-Fukherson
10804 — Gopher Strategy (UVA)
11506 — Angry Programmer (UVA) //Nodes division
10511 — Councilling (UVA)
563 — Crimewave
1306 — The K-League (UVA)
1345 — Jamie's Contact Groups
10092 — The Problem with the Problem Setter
Problem B. Roller Coaster Scheduling (GCJ — 2017)
259 — Software Allocation (UVA)
5905 — Pool construction (LA) //Imho harder
10480 — Sabotage
http://www.spoj.com/problems/MATCHING/ //Raw (no sauce)
6234 — Tile Cut (LA)
10080 — Gopher II (UVA) //Easy — sympathic
11419 — SAM I AM (UVA) //Grid-Matching
http://codeforces.me/gym/101485 (Elementary Math — E) //Very nice principal [not that hard]
3673 — Black-White Grid (UVA) //Grid
12927 — Points Cover (UVA)
6851 — The Programmers (LA)
6887 — Book Club //NICE
6571 — It Can Be Arranged
12530 — Game of Tiles
http://codeforces.me/gym/100820 (Airport — A) //Nice one
http://codeforces.me/gym/100753 (Bounty Hunterr II — B) //VERY NICE — I refered multiple times to this principal
http://www.spoj.com/problems/NITT4/
http://codeforces.me/gym/101408 (Cat vs Dog — C)
1171 — Knights in Chessboard (II) (LOJ) //Classical chess
11985 — Prime Independence (UVA)
http://www.spoj.com/problems/SCPC11H/ //Very nice — yet not hard
12644 — Vocabulary
http://codeforces.me/gym/101047/problem/H
http://codeforces.me/problemset/problem/659/E
12972 — Cuban Challenge (UVA)
1201 — Taxi Cab Scheme (UVA)
12963 — Astragalus Nitidiflorus
6525 — Attacking rooks (LA)
3415 — Guardian of Decency (LA)
http://www.spoj.com/problems/AMR12A/
12159 — Gun Fight (UVA)
https://www.codechef.com/problems/CHEFYODA //Imho matching is not the crucial part here
12831 — Bob the Builder
http://codeforces.me/problemset/problem/831/D
11262 — Weird Fence
12549 — Sentry Robots
11138 — Nuts and Bolts
http://www.spoj.com/problems/ADACITY/
http://www.spoj.com/problems/ADAPATH/
http://www.spoj.com/problems/ADAGROW/
http://codeforces.me/gym/100800 (Aqueduct Construction — A)
10806 — Dijkstra, Dijkstra.
12944 — Earthquake Disaster
12891 — Risk of Trading
11613 — Acme Corporation
https://www.codechef.com/problems/HOGON
http://www.spoj.com/problems/BNMT/ //Solved with MCMF yet I remember I thought normal flows would work too
http://codeforces.me/problemset/problem/818/G
http://codeforces.me/problemset/problem/802/C
http://codeforces.me/contest/863/problem/F (5) //VERY NICE
11594 — All Pairs Maximum Flow (UVA)
http://www.spoj.com/problems/ADABLOOM/ //Maximum matching in general graph
11439 — Maximizing the ICPC //Maximum matching in general graph
1376 — Animal Run //Max flow on planar graph (Dual == shortest path over edges)
10989 — Bomb, Divide and Conquer //Stoer-Wagner — global cut
Thanx — Good Luck & Have Nice day
If thereare any other request (there are many algorithms that were not included), try to ask (maybe the luck will be with you :P )
Thanks a lot :)
Hi -Morass- maybe it's too much! but could you put a list of only dp on trees? It's a difficult topic for me and I want to train it! btw thank you for this list and your time You're awesome!
Good day to you,
well they are slightly hard to recognize :/ {hard to find any keywords in it}... so there are just a few of them (and I also don't promise it is alway optimal solution)
13089 — Golden Coins (UVA)
http://codeforces.me/problemset/problem/855/C
http://codeforces.me/problemset/problem/718/D
https://www.codechef.com/problems/TWOCOINS
https://www.hackerrank.com/contests/101hack35/challenges/road- maintenance/problem
7649 — Performance Review (LA)
http://codeforces.me/problemset/problem/741/D
http://codeforces.me/problemset/problem/592/D
https://www.codechef.com/problems/TOMJERGA
http://codeforces.me/problemset/problem/814/D
1220 — Party at Hali-Bula (UVA)
https://www.hackerrank.com/contests/june-world-codesprint/challenges/r- tree-decoration/problem
12452 — Plants vs. Zombies HD SP (UVA)
http://codeforces.me/problemset/problem/735/E
https://www.codechef.com/problems/COLTREE
12466 — Ancestors (UVA)
6829 — Intrepid climber (LA)
https://www.hackerrank.com/contests/101hack35/challenges/jeanies-route
12257 — The Queue (UVA)
http://www.spoj.com/problems/ADASALES/
http://codeforces.me/problemset/problem/805/F
http://codeforces.me/problemset/problem/763/D
1218 — Perfect Service
3346 — Perfect Domination on Trees (same as above -_-)
12093 — Protecting Zonk
http://codeforces.me/problemset/problem/23/E
http://codeforces.me/problemset/problem/14/D
http://www.spoj.com/problems/TWOPATHS/ //Same as above ~ bigger constraints
Good Luck & Have Nice Day ^_^
Hi there, the bounds for 727D look a little large for flow. How'd you do it? I passed with a greedy after realising that my Dinic's was too slow.
I don't know how should I thank you. You are too awesome ^_^ Thank You for your hard work. Ttttttttttttttttttttttttthhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaannnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk Yyyyyyyyyyyyyyyyyyyyyyyyyyyyooooooooooooooooooooooooooooooooooooooooooooouuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu ^_^
-Morass- you have numbers next to the problems can you tell me what is it. Is it the number of how hard is that problem or what? by the way thangs for such great comment.
Good day to you,
well kind-of.. it is a difficulty rating from 1→10 .. depending on what feeling I had ... yet it is pretty much biased by the current feeling xP
Usually:
1) Very trivial
2) Trivial, but at least not just dull print from input :P
3) Usually some lesser idea/algo but shall not be difficult
4) Guess this shall be average problem, which is not too hard, yet requires some skill or maybe algo/DS.
5) There shall be hard implementation or nontrivial ideas
6+ Same as 5, but more and more difficult x)
Good Luck!
Thank you very much. you are very kind person.
I have solved 4 problems which is in 5 catagory recently and a lot of problems which is in 4 catagory. Does this mean I have become better??
How to solve Spoj Got using Mo's algo ? In case the tree given was a binary tree, I would have flattened it into array and do the normal MO's query sort and answer, but the tree can be non-binary as well. What to do ?
Good day to you,
Hope I have correct blog.. here shall be tutorial!
Good luck!
Sorry, but what is UVA???
Well it is an online judge with plenty of problems (not really sure if not renamed yet :O )
Thanks!
Did anyone count how many problems -Morass- posted? :p btw thanks for this collection .
There are 94 topics and total of around 900 problems.
_/\ _ for your patience bro .
Nothing is difficult for a programer. Took me 5 minutes to write the program to count the number of lines in the text. Anyways, thank you.
One could use "wc -l" (at least as soon as you are using bash) => "cat filename| wc -l"
Or just "wc -l filename"?
"Nothing is difficult for a programmer"
Cyan coder
wow, nice attitude you got there!
You know, being good at CF != being good at programming
Never stated the opposite. However, "Nothing is difficult for a programmer" implies being able to handle both easily.
I meant in the sense that a non-programmer would have counted the lines but for a programmer most of the computer jobs are an easy work sometimes due to his programming skills. Sorry if I offended high rated guys.
Yeah, I know you didn't mean it literally. My comment was meant to be a joke, not a form of offence.
How did you count the lines in the browser ?
Exemplary persistence! I am not sure if I even solved 900 problems, let alone "interesting ones" and "recently".
I have solved around 1200 problems and I am still cyan. Some people are really lucky!
Yes
Maybe You dont the correct way
vatsals1
this link may be helpfull
Well, A2 Online Judge is permanently shut down.