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Before contest
Codeforces Round 941 (Div. 1)
34:00:12
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Before contest
Codeforces Round 941 (Div. 2)
34:00:12
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→ Filter Problems
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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
747E
Comments
dfs and similar
,
expression parsing
,
implementation
,
strings
1700
x1937
1776G
Another Wine Tasting Event
combinatorics
,
constructive algorithms
,
math
,
strings
2100
x1943
250B
Restoring IPv6
implementation
,
strings
1500
x1945
727B
Bill Total Value
expression parsing
,
implementation
,
strings
1600
x1964
149E
Martian Strings
string suffix structures
,
strings
2300
x1966
1056E
Check Transcription
brute force
,
data structures
,
hashing
,
strings
2100
x1968
235C
Cyclical Quest
data structures
,
string suffix structures
,
strings
2700
x1978
631D
Messenger
data structures
,
hashing
,
implementation
,
string suffix structures
,
strings
2100
x1982
1578H
Higher Order Functions
implementation
,
strings
1700
x1987
1898E
Sofia and Strings
data structures
,
greedy
,
sortings
,
strings
,
two pointers
2200
x2027
1729G
Cut Substrings
combinatorics
,
dp
,
hashing
,
strings
,
two pointers
2100
x2050
1158B
The minimal unique substring
constructive algorithms
,
math
,
strings
2200
x2056
1282D
Enchanted Artifact
constructive algorithms
,
interactive
,
strings
2300
x2058
427D
Match & Catch
dp
,
string suffix structures
,
strings
2200
x2084
526D
Om Nom and Necklace
hashing
,
string suffix structures
,
strings
2200
x2092
25E
Test
hashing
,
strings
2200
x2165
533E
Correcting Mistakes
constructive algorithms
,
dp
,
greedy
,
hashing
,
strings
,
two pointers
1800
x2169
1821E
Rearrange Brackets
brute force
,
dp
,
greedy
,
sortings
,
strings
2100
x2229
113A
Grammar Lessons
implementation
,
strings
1600
x2230
1476E
Pattern Matching
bitmasks
,
data structures
,
dfs and similar
,
graphs
,
hashing
,
sortings
,
strings
2300
x2238
724D
Dense Subsequence
data structures
,
greedy
,
strings
1900
x2249
615C
Running Track
dp
,
greedy
,
strings
,
trees
2000
x2251
533B
Work Group
dfs and similar
,
dp
,
graphs
,
strings
,
trees
2000
x2298
757C
Felicity is Coming!
data structures
,
hashing
,
sortings
,
strings
1900
x2306
1213F
Unstable String Sort
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
strings
2100
x2323
1930D2
Sum over all Substrings (Hard Version)
bitmasks
,
divide and conquer
,
dp
,
dsu
,
greedy
,
implementation
,
strings
2100
x2338
1526D
Kill Anton
brute force
,
constructive algorithms
,
data structures
,
math
,
strings
2200
x2350
1202C
You Are Given a WASD-string...
brute force
,
data structures
,
dp
,
greedy
,
implementation
,
math
,
strings
2100
x2351
762C
Two strings
binary search
,
hashing
,
strings
,
two pointers
2100
x2351
1616E
Lexicographically Small Enough
brute force
,
data structures
,
greedy
,
strings
2200
x2379
1736D
Equal Binary Subsequences
constructive algorithms
,
geometry
,
greedy
,
implementation
,
strings
2200
x2385
808G
Anthem of Berland
dp
,
strings
2300
x2396
1411D
Grime Zoo
brute force
,
greedy
,
implementation
,
strings
2100
x2422
128B
String
brute force
,
constructive algorithms
,
hashing
,
implementation
,
string suffix structures
,
strings
2100
x2452
1864E
Guess Game
bitmasks
,
data structures
,
games
,
math
,
probabilities
,
sortings
,
strings
,
trees
2100
x2459
691C
Exponential notation
implementation
,
strings
1800
x2473
611D
New Year and Ancient Prophecy
dp
,
hashing
,
strings
2000
x2510
118C
Fancy Number
brute force
,
greedy
,
sortings
,
strings
1900
x2514
121B
Lucky Transformation
strings
1500
x2524
1303E
Erase Subsequences
dp
,
strings
2200
x2564
494B
Obsessive String
dp
,
strings
2000
x2567
725C
Hidden Word
brute force
,
constructive algorithms
,
implementation
,
strings
1600
x2584
1771D
Hossam and (sub-)palindromic tree
brute force
,
data structures
,
dfs and similar
,
dp
,
strings
,
trees
2100
x2585
1660F2
Promising String (hard version)
data structures
,
implementation
,
math
,
strings
2100
x2585
1730D
Prefixes and Suffixes
constructive algorithms
,
strings
,
two pointers
2200
x2586
930B
Game with String
implementation
,
probabilities
,
strings
1600
x2587
633C
Spy Syndrome 2
data structures
,
dp
,
hashing
,
implementation
,
sortings
,
string suffix structures
,
strings
1900
x2598
758D
Ability To Convert
constructive algorithms
,
dp
,
greedy
,
math
,
strings
2000
x2682
113B
Petr#
brute force
,
data structures
,
hashing
,
strings
2000
x2708
629C
Famil Door and Brackets
dp
,
strings
2000
x2733
39J
Spelling Check
hashing
,
implementation
,
strings
1500
x2784
1147B
Chladni Figure
brute force
,
strings
1900
x2791
1538E
Funny Substrings
data structures
,
hashing
,
implementation
,
matrices
,
strings
2100
x2798
780D
Innokenty and a Football League
2-sat
,
graphs
,
greedy
,
implementation
,
shortest paths
,
strings
1900
x2840
1951E
No Palindromes
brute force
,
constructive algorithms
,
divide and conquer
,
greedy
,
hashing
,
implementation
,
math
,
strings
2000
x2841
1267L
Lexicography
constructive algorithms
,
strings
1800
x2846
1204D1
Kirk and a Binary String (easy version)
brute force
,
greedy
,
strings
2000
x2848
665E
Beautiful Subarrays
data structures
,
divide and conquer
,
strings
,
trees
2100
x2853
1530E
Minimax
constructive algorithms
,
greedy
,
strings
2100
x2890
1183H
Subsequences (hard version)
dp
,
strings
1900
x2898
159C
String Manipulation 1.0
*special problem
,
binary search
,
brute force
,
data structures
,
strings
1400
x2914
1204D2
Kirk and a Binary String (hard version)
data structures
,
greedy
,
math
,
strings
2100
x2971
291B
Command Line Arguments
*special problem
,
implementation
,
strings
1300
x3010
1838D
Bracket Walk
data structures
,
greedy
,
strings
2100
x3049
1256F
Equalizing Two Strings
constructive algorithms
,
sortings
,
strings
2000
x3049
722D
Generating Sets
binary search
,
data structures
,
dfs and similar
,
greedy
,
strings
,
trees
1900
x3073
1943B
Non-Palindromic Substring
hashing
,
implementation
,
math
,
strings
2000
x3130
670E
Correct Bracket Sequence Editor
data structures
,
dsu
,
strings
1700
x3139
1685B
Linguistics
greedy
,
implementation
,
sortings
,
strings
2000
x3149
682D
Alyona and Strings
dp
,
strings
1900
x3171
75B
Facetook Priority Wall
expression parsing
,
implementation
,
strings
1500
x3203
1950G
Shuffling Songs
bitmasks
,
dfs and similar
,
dp
,
graphs
,
hashing
,
implementation
,
strings
1900
x3248
346B
Lucky Common Subsequence
dp
,
strings
2000
x3321
1336C
Kaavi and Magic Spell
dp
,
strings
2200
x3326
928A
Login Verification
*special problem
,
strings
1200
x3331
666A
Reberland Linguistics
dp
,
implementation
,
strings
1800
x3413
278B
New Problem
brute force
,
strings
1500
x3416
91A
Newspaper Headline
greedy
,
strings
1500
x3448
7D
Palindrome Degree
hashing
,
strings
2200
x3495
123A
Prime Permutation
implementation
,
number theory
,
strings
1300
x3511
147A
Punctuation
implementation
,
strings
1300
x3548
1847D
Professor Higashikata
data structures
,
dsu
,
greedy
,
implementation
,
strings
1900
x3588
1823D
Unique Palindromes
constructive algorithms
,
math
,
strings
1900
x3636
1930D1
Sum over all Substrings (Easy Version)
brute force
,
dp
,
greedy
,
strings
1800
x3645
1800F
Dasha and Nightmares
bitmasks
,
hashing
,
meet-in-the-middle
,
strings
1900
x3669
358B
Dima and Text Messages
brute force
,
strings
1500
x3675
1902E
Collapsing Strings
data structures
,
strings
,
trees
1900
x3708
535D
Tavas and Malekas
greedy
,
hashing
,
string suffix structures
,
strings
1900
x3712
260B
Ancient Prophesy
brute force
,
implementation
,
strings
1600
x3735
551B
ZgukistringZ
brute force
,
constructive algorithms
,
implementation
,
strings
1800
x3759
61B
Hard Work
strings
1300
x3779
412C
Pattern
implementation
,
strings
1200
x3845
144C
Anagram Search
implementation
,
strings
1500
x3880
835D
Palindromic characteristics
brute force
,
dp
,
hashing
,
strings
1900
x3887
1624E
Masha-forgetful
brute force
,
constructive algorithms
,
dp
,
hashing
,
implementation
,
strings
2000
x3925
1138B
Circus
brute force
,
greedy
,
math
,
strings
1800
x3930
827A
String Reconstruction
data structures
,
greedy
,
sortings
,
strings
1700
x3936
443B
Kolya and Tandem Repeat
brute force
,
implementation
,
strings
1500
x3964
1144E
Median String
bitmasks
,
math
,
number theory
,
strings
1900
x3984
1618F
Reverse
bitmasks
,
constructive algorithms
,
dfs and similar
,
implementation
,
math
,
strings
2000
x4015
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