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Before contest
Codeforces Round 940 (Div. 2) and CodeCraft-23
33:29:53
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Difficulty:
—
strings
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
1550E
Stringforces
binary search
,
bitmasks
,
brute force
,
dp
,
strings
,
two pointers
2500
x1437
963D
Frequency of String
hashing
,
string suffix structures
,
strings
2500
x1793
580E
Kefa and Watch
data structures
,
hashing
,
strings
2500
x1931
177G1
Fibonacci Strings
strings
2400
x162
1055D
Refactoring
greedy
,
implementation
,
strings
2400
x614
1017E
The Supersonic Rocket
geometry
,
hashing
,
strings
2400
x806
1777F
Comfortably Numb
bitmasks
,
data structures
,
divide and conquer
,
strings
,
trees
2400
x807
533F
Encoding
hashing
,
string suffix structures
,
strings
2400
x856
1080E
Sonya and Matrix Beauty
strings
2400
x878
1129C
Morse Code
binary search
,
data structures
,
dp
,
hashing
,
sortings
,
string suffix structures
,
strings
2400
x895
452E
Three strings
data structures
,
dsu
,
string suffix structures
,
strings
2400
x1022
601D
Acyclic Organic Compounds
data structures
,
dfs and similar
,
dsu
,
hashing
,
strings
,
trees
2400
x1081
1679E
Typical Party in Dorm
bitmasks
,
combinatorics
,
dp
,
strings
2400
x1090
873F
Forbidden Indices
dsu
,
string suffix structures
,
strings
2400
x1284
825F
String Compression
dp
,
hashing
,
string suffix structures
,
strings
2400
x1295
1750E
Bracket Cost
binary search
,
data structures
,
divide and conquer
,
dp
,
greedy
,
strings
2400
x1342
1499E
Chaotic Merge
combinatorics
,
dp
,
math
,
strings
2400
x1402
710F
String Set Queries
brute force
,
data structures
,
hashing
,
interactive
,
string suffix structures
,
strings
2400
x1661
1720D2
Xor-Subsequence (hard version)
bitmasks
,
data structures
,
dp
,
strings
,
trees
2400
x1717
467D
Fedor and Essay
dfs and similar
,
dp
,
graphs
,
hashing
,
strings
2400
x1760
1202E
You Are Given Some Strings...
brute force
,
string suffix structures
,
strings
2400
x1772
1469E
A Bit Similar
bitmasks
,
brute force
,
hashing
,
string suffix structures
,
strings
,
two pointers
2400
x1845
1211F
kotlinkotlinkotlinkotlin...
*special problem
,
graphs
,
implementation
,
strings
2300
x118
856B
Similar Words
dp
,
hashing
,
strings
,
trees
2300
x475
670F
Restore a Number
brute force
,
constructive algorithms
,
strings
2300
x846
1085E
Vasya and Templates
greedy
,
implementation
,
strings
2300
x854
566A
Matching Names
dfs and similar
,
strings
,
trees
2300
x867
1065E
Side Transmutations
combinatorics
,
strings
2300
x1016
1015F
Bracket Substring
dp
,
strings
2300
x1038
557E
Ann and Half-Palindrome
data structures
,
dp
,
graphs
,
string suffix structures
,
strings
,
trees
2300
x1046
727E
Games on a CD
data structures
,
hashing
,
string suffix structures
,
strings
2300
x1108
1131E
String Multiplication
dp
,
greedy
,
strings
2300
x1117
936C
Lock Puzzle
constructive algorithms
,
implementation
,
strings
2300
x1148
1411E
Poman Numbers
bitmasks
,
greedy
,
math
,
strings
2300
x1551
985F
Isomorphic Strings
hashing
,
strings
2300
x1693
149E
Martian Strings
string suffix structures
,
strings
2300
x1965
1282D
Enchanted Artifact
constructive algorithms
,
interactive
,
strings
2300
x2032
1476E
Pattern Matching
bitmasks
,
data structures
,
dfs and similar
,
graphs
,
hashing
,
sortings
,
strings
2300
x2237
808G
Anthem of Berland
dp
,
strings
2300
x2385
558E
A Simple Task
data structures
,
sortings
,
strings
2300
x5546
345G
Suffix Subgroup
*special problem
,
strings
2200
x51
178F2
Representative Sampling
dp
,
sortings
,
strings
2200
x310
802H
Fake News (medium)
constructive algorithms
,
strings
2200
x424
1575H
Holiday Wall Ornaments
dp
,
strings
2200
x568
1231E
Middle-Out
constructive algorithms
,
greedy
,
strings
2200
x675
868D
Huge Strings
bitmasks
,
brute force
,
dp
,
implementation
,
strings
2200
x889
754C
Vladik and chat
brute force
,
constructive algorithms
,
dp
,
implementation
,
strings
2200
x897
1003F
Abbreviation
dp
,
hashing
,
strings
2200
x1092
645E
Intellectual Inquiry
dp
,
greedy
,
strings
2200
x1213
903E
Swapping Characters
brute force
,
hashing
,
implementation
,
strings
2200
x1249
965E
Short Code
data structures
,
dp
,
greedy
,
strings
,
trees
2200
x1324
979D
Kuro and GCD and XOR and SUM
binary search
,
bitmasks
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
math
,
number theory
,
strings
,
trees
2200
x1676
1272F
Two Bracket Sequences
dp
,
strings
,
two pointers
2200
x1739
476E
Dreamoon and Strings
dp
,
strings
2200
x1755
1721E
Prefix Function Queries
dfs and similar
,
dp
,
hashing
,
string suffix structures
,
strings
,
trees
2200
x1799
1149B
Three Religions
dp
,
implementation
,
strings
2200
x1858
1898E
Sofia and Strings
data structures
,
greedy
,
sortings
,
strings
,
two pointers
2200
x2019
1158B
The minimal unique substring
constructive algorithms
,
math
,
strings
2200
x2053
427D
Match & Catch
dp
,
string suffix structures
,
strings
2200
x2081
526D
Om Nom and Necklace
hashing
,
string suffix structures
,
strings
2200
x2089
25E
Test
hashing
,
strings
2200
x2159
1526D
Kill Anton
brute force
,
constructive algorithms
,
data structures
,
math
,
strings
2200
x2343
1616E
Lexicographically Small Enough
brute force
,
data structures
,
greedy
,
strings
2200
x2375
1736D
Equal Binary Subsequences
constructive algorithms
,
geometry
,
greedy
,
implementation
,
strings
2200
x2383
1303E
Erase Subsequences
dp
,
strings
2200
x2532
1730D
Prefixes and Suffixes
constructive algorithms
,
strings
,
two pointers
2200
x2584
1336C
Kaavi and Magic Spell
dp
,
strings
2200
x3323
7D
Palindrome Degree
hashing
,
strings
2200
x3489
1537E2
Erase and Extend (Hard Version)
binary search
,
data structures
,
greedy
,
hashing
,
string suffix structures
,
strings
,
two pointers
2200
x4955
38F
Smart Boy
dp
,
games
,
strings
2100
x374
54D
Writing a Song
brute force
,
dp
,
strings
2100
x503
644C
Hostname Aliases
*special problem
,
binary search
,
data structures
,
implementation
,
sortings
,
strings
2100
x908
900E
Maximum Questions
data structures
,
dp
,
strings
2100
x1023
895D
String Mark
combinatorics
,
math
,
strings
2100
x1084
1163D
Mysterious Code
dp
,
strings
2100
x1208
552E
Vanya and Brackets
brute force
,
dp
,
expression parsing
,
greedy
,
implementation
,
strings
2100
x1408
899F
Letters Removing
data structures
,
strings
2100
x1570
827C
DNA Evolution
data structures
,
strings
2100
x1608
1120C
Compress String
dp
,
strings
2100
x1867
1776G
Another Wine Tasting Event
combinatorics
,
constructive algorithms
,
math
,
strings
2100
x1938
1056E
Check Transcription
brute force
,
data structures
,
hashing
,
strings
2100
x1959
631D
Messenger
data structures
,
hashing
,
implementation
,
string suffix structures
,
strings
2100
x1972
1729G
Cut Substrings
combinatorics
,
dp
,
hashing
,
strings
,
two pointers
2100
x2043
1821E
Rearrange Brackets
brute force
,
dp
,
greedy
,
sortings
,
strings
2100
x2219
1213F
Unstable String Sort
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
strings
2100
x2311
1930D2
Sum over all Substrings (Hard Version)
bitmasks
,
divide and conquer
,
dp
,
dsu
,
greedy
,
implementation
,
strings
2100
x2321
1202C
You Are Given a WASD-string...
brute force
,
data structures
,
dp
,
greedy
,
implementation
,
math
,
strings
2100
x2345
762C
Two strings
binary search
,
hashing
,
strings
,
two pointers
2100
x2350
1411D
Grime Zoo
brute force
,
greedy
,
implementation
,
strings
2100
x2420
128B
String
brute force
,
constructive algorithms
,
hashing
,
implementation
,
string suffix structures
,
strings
2100
x2450
1864E
Guess Game
bitmasks
,
data structures
,
games
,
math
,
probabilities
,
sortings
,
strings
,
trees
2100
x2457
1771D
Hossam and (sub-)palindromic tree
brute force
,
data structures
,
dfs and similar
,
dp
,
strings
,
trees
2100
x2579
1660F2
Promising String (hard version)
data structures
,
implementation
,
math
,
strings
2100
x2580
1538E
Funny Substrings
data structures
,
hashing
,
implementation
,
matrices
,
strings
2100
x2795
665E
Beautiful Subarrays
data structures
,
divide and conquer
,
strings
,
trees
2100
x2848
1530E
Minimax
constructive algorithms
,
greedy
,
strings
2100
x2889
1204D2
Kirk and a Binary String (hard version)
data structures
,
greedy
,
math
,
strings
2100
x2969
1838D
Bracket Walk
data structures
,
greedy
,
strings
2100
x3040
1409F
Subsequences of Length Two
dp
,
strings
2100
x4259
386C
Diverse Substrings
dp
,
strings
,
two pointers
2000
x710
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