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Codeforces Round 973 (Div. 2)
13:46:03
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Difficulty:
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hashing
combine-tags-by-or
*combine tags by OR
2-sat
binary search
bitmasks
brute force
chinese remainder theorem
combinatorics
constructive algorithms
data structures
dfs and similar
divide and conquer
dp
dsu
expression parsing
fft
flows
games
geometry
graph matchings
graphs
greedy
hashing
implementation
interactive
math
matrices
meet-in-the-middle
number theory
probabilities
schedules
shortest paths
sortings
string suffix structures
strings
ternary search
trees
two pointers
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Problems
#
Name
1257F
Make Them Similar
bitmasks
,
brute force
,
hashing
,
meet-in-the-middle
2400
x2008
1252F
Regular Forestation
hashing
,
trees
2400
x922
1228D
Complete Tripartite
brute force
,
constructive algorithms
,
graphs
,
hashing
,
implementation
1900
x5200
1225D
Power Products
hashing
,
math
,
number theory
1800
x7949
1223F
Stack Exterminable Arrays
data structures
,
divide and conquer
,
dp
,
hashing
2600
x2046
1214D
Treasure Island
dfs and similar
,
dp
,
flows
,
hashing
1900
x5157
1207G
Indie Album
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
2700
x1014
1200E
Compress Words
brute force
,
hashing
,
implementation
,
string suffix structures
,
strings
2000
x7613
1182D
Complete Mirror
constructive algorithms
,
dfs and similar
,
dp
,
hashing
,
implementation
,
trees
2400
x828
1175F
The Number of Subpermutations
brute force
,
data structures
,
divide and conquer
,
hashing
,
math
2500
x1815
1166F
Vicky's Delivery Service
data structures
,
dsu
,
graphs
,
hashing
2400
x701
1156G
Optimizer
graphs
,
greedy
,
hashing
,
implementation
2700
x128
1137B
Camp Schedule
greedy
,
hashing
,
strings
1600
x6122
1133D
Zero Quantity Maximization
hashing
,
math
,
number theory
1500
x11713
1129C
Morse Code
binary search
,
data structures
,
dp
,
hashing
,
sortings
,
string suffix structures
,
strings
2400
x918
1109B
Sasha and One More Name
constructive algorithms
,
hashing
,
strings
1800
x4346
1081H
Palindromic Magic
data structures
,
hashing
,
strings
3500
x105
1056E
Check Transcription
brute force
,
data structures
,
hashing
,
strings
2100
x2237
1051E
Vasya and Big Integers
binary search
,
data structures
,
dp
,
hashing
,
strings
2600
x947
1045I
Palindrome Pairs
hashing
,
strings
1600
x4392
1045B
Space Isaac
hashing
,
number theory
2400
x513
1043G
Speckled Band
data structures
,
divide and conquer
,
hashing
,
string suffix structures
,
strings
3500
x236
1017E
The Supersonic Rocket
geometry
,
hashing
,
strings
2400
x1024
1003F
Abbreviation
dp
,
hashing
,
strings
2200
x1354
985F
Isomorphic Strings
hashing
,
strings
2300
x1844
963D
Frequency of String
hashing
,
string suffix structures
,
strings
2500
x1971
961F
k-substrings
binary search
,
hashing
,
string suffix structures
2700
x785
958A2
Death Stars (medium)
hashing
,
strings
2000
x897
903E
Swapping Characters
brute force
,
hashing
,
implementation
,
strings
2200
x1462
898F
Restoring the Expression
brute force
,
hashing
,
math
2300
x1187
877F
Ann and Books
data structures
,
flows
,
hashing
2300
x1780
869E
The Untended Antiquity
data structures
,
hashing
2400
x1733
856B
Similar Words
dp
,
hashing
,
strings
,
trees
2300
x499
847L
Berland SU Computer Network
constructive algorithms
,
dfs and similar
,
graphs
,
hashing
,
trees
2400
x320
835D
Palindromic characteristics
brute force
,
dp
,
hashing
,
strings
1900
x4103
825F
String Compression
dp
,
hashing
,
string suffix structures
,
strings
2400
x1491
822E
Liar
binary search
,
dp
,
hashing
,
string suffix structures
2400
x837
794D
Labelling Cities
dfs and similar
,
graphs
,
hashing
2400
x813
786D
Rap God
data structures
,
dfs and similar
,
hashing
,
strings
,
trees
3400
x142
778C
Peterson Polyglot
brute force
,
dfs and similar
,
dsu
,
hashing
,
strings
,
trees
2500
x884
763D
Timofey and a flat tree
data structures
,
graphs
,
hashing
,
shortest paths
,
trees
2900
x551
762C
Two strings
binary search
,
hashing
,
strings
,
two pointers
2100
x2475
757C
Felicity is Coming!
data structures
,
hashing
,
sortings
,
strings
1900
x2332
733D
Kostya the Sculptor
data structures
,
hashing
1600
x4165
727E
Games on a CD
data structures
,
hashing
,
string suffix structures
,
strings
2300
x1198
724C
Ray Tracing
greedy
,
hashing
,
implementation
,
math
,
number theory
,
sortings
1800
x2134
718D
Andrew and Chemistry
dp
,
hashing
,
trees
2900
x394
710F
String Set Queries
brute force
,
data structures
,
hashing
,
interactive
,
string suffix structures
,
strings
2400
x1857
690F2
Tree of Life (medium)
constructive algorithms
,
hashing
,
trees
2700
x81
650D
Zip-line
binary search
,
data structures
,
dp
,
hashing
2600
x1324
639C
Bear and Polynomials
hashing
,
implementation
,
math
2200
x1199
633D
Fibonacci-ish
brute force
,
dp
,
hashing
,
implementation
,
math
2000
x2783
633C
Spy Syndrome 2
data structures
,
dp
,
hashing
,
implementation
,
sortings
,
string suffix structures
,
strings
1900
x2748
631D
Messenger
data structures
,
hashing
,
implementation
,
string suffix structures
,
strings
2100
x2070
613E
Puzzle Lover
dp
,
hashing
,
strings
3200
x461
611D
New Year and Ancient Prophecy
dp
,
hashing
,
strings
2000
x2584
607C
Marbles
hashing
,
strings
2500
x785
601D
Acyclic Organic Compounds
data structures
,
dfs and similar
,
dsu
,
hashing
,
strings
,
trees
2400
x1139
580E
Kefa and Watch
data structures
,
hashing
,
strings
2500
x2036
574B
Bear and Three Musketeers
brute force
,
dfs and similar
,
graphs
,
hashing
1500
x7765
567E
President and Roads
dfs and similar
,
graphs
,
hashing
,
shortest paths
2200
x1734
559B
Equivalent Strings
divide and conquer
,
hashing
,
sortings
,
strings
1700
x10594
542D
Superhero's Job
dfs and similar
,
dp
,
hashing
,
math
,
number theory
2600
x509
535D
Tavas and Malekas
greedy
,
hashing
,
string suffix structures
,
strings
1900
x3939
534F
Simplified Nonogram
bitmasks
,
dp
,
hashing
,
meet-in-the-middle
2400
x470
534E
Berland Local Positioning System
constructive algorithms
,
greedy
,
hashing
,
implementation
2400
x346
533F
Encoding
hashing
,
string suffix structures
,
strings
2400
x892
533E
Correcting Mistakes
constructive algorithms
,
dp
,
greedy
,
hashing
,
strings
,
two pointers
1800
x2254
526D
Om Nom and Necklace
hashing
,
string suffix structures
,
strings
2200
x2148
525A
Vitaliy and Pie
greedy
,
hashing
,
strings
1100
x14488
524F
And Yet Another Bracket Sequence
data structures
,
greedy
,
hashing
,
string suffix structures
,
strings
2700
x527
514C
Watto and Mechanism
binary search
,
data structures
,
hashing
,
string suffix structures
,
strings
2000
x6792
504E
Misha and LCP on Tree
binary search
,
dfs and similar
,
hashing
,
string suffix structures
,
trees
3000
x908
486E
LIS of Sequence
data structures
,
dp
,
greedy
,
hashing
,
math
2200
x2232
486B
OR in Matrix
greedy
,
hashing
,
implementation
1300
x17492
467D
Fedor and Essay
dfs and similar
,
dp
,
graphs
,
hashing
,
strings
2400
x1821
463C
Gargari and Bishops
greedy
,
hashing
,
implementation
1900
x8717
452F
Permutation
data structures
,
divide and conquer
,
hashing
2700
x1489
444D
DZY Loves Strings
binary search
,
hashing
,
strings
,
two pointers
2500
x773
425D
Sereja and Squares
binary search
,
data structures
,
hashing
2300
x1432
407D
Largest Submatrix 3
dp
,
hashing
2700
x561
356E
Xenia and String Problem
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
3000
x408
350D
Looking for Owls
binary search
,
data structures
,
geometry
,
hashing
,
sortings
2400
x263
319D
Have You Ever Heard About the Word?
greedy
,
hashing
,
string suffix structures
,
strings
2800
x650
316G1
Good Substrings
hashing
,
strings
1700
x952
291E
Tree-String Problem
*special problem
,
dfs and similar
,
hashing
,
strings
2000
x1307
245H
Queries for Number of Palindromes
dp
,
hashing
,
strings
1800
x6553
242C
King's Path
dfs and similar
,
graphs
,
hashing
,
shortest paths
1800
x8524
228C
Fractal Detector
dp
,
hashing
2000
x453
213E
Two Permutations
data structures
,
hashing
,
strings
2700
x792
212B
Polycarpus is Looking for Good Substrings
bitmasks
,
hashing
,
implementation
2300
x332
196D
The Next Good String
data structures
,
greedy
,
hashing
,
strings
2800
x531
190E
Counter Attack
data structures
,
dsu
,
graphs
,
hashing
,
sortings
2100
x1518
182D
Common Divisors
brute force
,
hashing
,
implementation
,
math
,
strings
1400
x8024
154C
Double Profiles
graphs
,
hashing
,
sortings
2300
x2786
128B
String
brute force
,
constructive algorithms
,
hashing
,
implementation
,
string suffix structures
,
strings
2100
x2538
126B
Password
binary search
,
dp
,
hashing
,
string suffix structures
,
strings
1700
x19219
119D
String Transformation
hashing
,
strings
2500
x489
113B
Petr#
brute force
,
data structures
,
hashing
,
strings
2000
x2795
82B
Sets
constructive algorithms
,
hashing
,
implementation
1700
x2029
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