Problemset - Codeforces

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Ethflow Round 1 (Codeforces Round, Div. 1 + Div. 2)
2 days
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Problems

#	Name
1558D	Top-Notch Insertions combinatorics, data structures	2600	x1000
1558C	Bottom-Tier Reversals constructive algorithms, greedy	2000	x3406
1558B	Up the Strip brute force, dp, math, number theory, two pointers	1900	x4878
1558A	Charmed by the Game brute force, math	1300	x11170
1557E	Assiut Chess brute force, constructive algorithms, interactive	2800	x721
1557D	Ezzat and Grid data structures, dp, greedy	2200	x2595
1557C	Moamen and XOR bitmasks, combinatorics, dp, math, matrices	1700	x8784
1557B	Moamen and k-subarrays greedy, sortings	1100	x23684
1557A	Ezzat and Two Subsequences brute force, math, sortings	800	x28156
1556H	DIY Tree graphs, greedy, math, probabilities	3300	x378
1556G	Gates to Another World bitmasks, data structures, dsu, two pointers	3300	x350
1556F	Sports Betting bitmasks, combinatorics, dp, graphs, math, probabilities	2500	x1282
1556E	Equilibrium data structures, dp, greedy	2200	x2757
1556D	Take a Guess bitmasks, constructive algorithms, interactive, math	1800	x7211
1556C	Compressed Bracket Sequence brute force, implementation	1800	x5862
1556B	Take Your Places! implementation	1300	x12823
1556A	A Variety of Operations math	800	x18154
1555F	Good Graph data structures, dsu, graphs, trees	2700	x881
1555E	Boring Segments data structures, sortings, trees, two pointers	2100	x4113
1555D	Say No to Palindromes brute force, constructive algorithms, dp, strings	1600	x12814
1555C	Coin Rows brute force, constructive algorithms, dp, implementation	1300	x22251
1555B	Two Tables brute force	1300	x16283
1555A	PizzaForces brute force, math	900	x28615
1554E	You dfs and similar, dp, math, number theory	2600	x1253
1554D	Diane constructive algorithms, greedy, strings	1800	x9687
1554C	Mikasa binary search, bitmasks, greedy, implementation	1800	x9068
1554B	Cobb bitmasks, brute force, greedy, math	1700	x12987
1554A	Cherry greedy	800	x29761
1553I	Stairs combinatorics, divide and conquer, dp, fft, math	3400	x209
1553H	XOR and Distance bitmasks, divide and conquer, trees	2900	x744
1553G	Common Divisor Graph brute force, constructive algorithms, dsu, graphs, hashing, math, number theory	2700	x1069
1553F	Pairwise Modulo data structures, math	2300	x2271
1553E	Permutation Shift brute force, combinatorics, constructive algorithms, dfs and similar, dsu, graphs, math	2100	x3408
1553D	Backspace dp, greedy, strings, two pointers	1500	x13996
1553C	Penalty bitmasks, brute force, dp, greedy	1200	x18214
1553B	Reverse String brute force, dp, hashing, implementation, strings	1300	x14319
1553A	Digits Sum math, number theory	800	x31725
1552I	Organizing a Music Festival dfs and similar, math	3400	x130
1552H	Guess the Perimeter binary search, interactive, number theory	3300	x397
1552G	A Serious Referee bitmasks, brute force, dfs and similar, sortings	3000	x539
1552F	Telepanting binary search, data structures, dp, sortings	2200	x2994
1552E	Colors and Intervals constructive algorithms, data structures, greedy, sortings	2300	x1942
1552D	Array Differentiation bitmasks, brute force, constructive algorithms, dfs and similar, dp, graphs, math	1800	x7181
1552C	Maximize the Intersections combinatorics, constructive algorithms, geometry, greedy, sortings	1800	x5983
1552B	Running for Gold combinatorics, graphs, greedy, sortings	1500	x15711
1552A	Subsequence Permutation sortings, strings	800	x24066
1551F	Equidistant Vertices brute force, combinatorics, dfs and similar, dp, trees	2200	x1881
1551E	Fixed Points binary search, brute force, dp	2000	x4034
1551D2	Domino (hard version) constructive algorithms, implementation, math	2100	x2805
1551D1	Domino (easy version) constructive algorithms, math	1700	x7209
1551C	Interesting Story greedy, sortings, strings	1500	x13531
1551B2	Wonderful Coloring - 2 binary search, constructive algorithms, data structures, greedy	1400	x15731
1551B1	Wonderful Coloring - 1 greedy, strings	800	x29896
1551A	Polycarp and Coins greedy, math	800	x52713
1550F	Jumping Around binary search, data structures, divide and conquer, dp, dsu, graphs, shortest paths	2700	x707
1550E	Stringforces binary search, bitmasks, brute force, dp, strings, two pointers	2500	x1596
1550D	Excellent Arrays binary search, combinatorics, constructive algorithms, implementation, math, sortings, two pointers	2300	x1879
1550C	Manhattan Subarrays brute force, geometry, greedy, implementation	1700	x10318
1550B	Maximum Cost Deletion greedy, math	1000	x26931
1550A	Find The Array greedy, math	800	x28416
1549B	Gregor and the Pawn Game dfs and similar, dp, flows, graph matchings, graphs, greedy, implementation	800	x24829
1549A	Gregor and Cryptography math, number theory	800	x33157
1548E	Gregor and the Two Painters data structures, divide and conquer, graphs, greedy, math	3400	x484
1548D2	Gregor and the Odd Cows (Hard) brute force, geometry, math, number theory	3300	x266
1548D1	Gregor and the Odd Cows (Easy) bitmasks, geometry, math, number theory	2300	x1493
1548C	The Three Little Pigs combinatorics, dp, fft, math	2500	x1862
1548B	Integers Have Friends binary search, data structures, divide and conquer, math, number theory, two pointers	1800	x10181
1548A	Web of Lies brute force, graphs, greedy	1400	x16708
1547G	How Many Paths? dfs and similar, dp, graphs, trees	2100	x3120
1547F	Array Stabilization (GCD version) binary search, brute force, data structures, divide and conquer, number theory, two pointers	1900	x6023
1547E	Air Conditioners data structures, dp, implementation, shortest paths, sortings, two pointers	1500	x14774
1547D	Co-growing Sequence bitmasks, constructive algorithms, greedy	1300	x17127
1547C	Pair Programming greedy, two pointers	1100	x22989
1547B	Alphabetical Strings greedy, implementation, strings	800	x26721
1547A	Shortest Path with Obstacle implementation, math	800	x30942
1546B	AquaMoon and Stolen String interactive, math	1200	x13267
1546A	AquaMoon and Two Arrays brute force, greedy	800	x18317
1545F	AquaMoon and Potatoes brute force, data structures, dp	3500	x111
1545E2	AquaMoon and Time Stop (hard version) data structures, dp	3500	x89
1545E1	AquaMoon and Time Stop (easy version) data structures, dp	3500	x86
1545D	AquaMoon and Wrong Coordinate constructive algorithms, interactive, math	3000	x556
1545C	AquaMoon and Permutations 2-sat, brute force, combinatorics, constructive algorithms, graph matchings, graphs	2800	x647
1545B	AquaMoon and Chess combinatorics, math	1900	x6049
1545A	AquaMoon and Strange Sort sortings	1500	x14120
1543E	The Final Pursuit bitmasks, constructive algorithms, divide and conquer, graphs, greedy, math	2700	x419
1543D2	RPD and Rap Sheet (Hard Version) brute force, constructive algorithms, interactive, math	2200	x2036
1543D1	RPD and Rap Sheet (Easy Version) bitmasks, constructive algorithms, interactive, math	1700	x7688
1543C	Need for Pink Slips bitmasks, brute force, dfs and similar, implementation, math, probabilities	1900	x5354
1543B	Customising the Track combinatorics, greedy, math	900	x23466
1543A	Exciting Bets greedy, math, number theory	900	x29666
1542E2	Abnormal Permutation Pairs (hard version) combinatorics, dp, fft, math	2700	x880
1542E1	Abnormal Permutation Pairs (easy version) combinatorics, dp, fft, math	2400	x1275
1542D	Priority Queue combinatorics, dp, implementation, math, ternary search	2200	x2686
1542C	Strange Function math, number theory	1600	x14616
1542B	Plus and Multiply constructive algorithms, math, number theory	1500	x23792
1542A	Odd Set math	800	x46093
1541B	Pleasant Pairs brute force, implementation, math, number theory	1200	x29805
1541A	Pretty Permutations constructive algorithms, greedy, implementation	800	x29679
1540E	Tasty Dishes math, matrices	3500	x109
1540D	Inverse Inversions binary search, brute force, data structures	3200	x288