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Before contest
Codeforces Round 941 (Div. 1)
13:33:27
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*has extra registration
Before contest
Codeforces Round 941 (Div. 2)
13:33:28
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→ Filter Problems
Difficulty:
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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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Custom test
Problems
#
Name
963D
Frequency of String
hashing
,
string suffix structures
,
strings
2500
x1799
958A2
Death Stars (medium)
hashing
,
strings
2000
x875
955D
Scissors
brute force
,
strings
2600
x454
954B
String Typing
implementation
,
strings
1400
x7095
946C
String Transformation
greedy
,
strings
1300
x8759
940C
Phone Numbers
constructive algorithms
,
implementation
,
strings
1500
x5601
939D
Love Rescue
dfs and similar
,
dsu
,
graphs
,
greedy
,
strings
1600
x7098
936C
Lock Puzzle
constructive algorithms
,
implementation
,
strings
2300
x1149
932G
Palindrome Partition
dp
,
string suffix structures
,
strings
2900
x872
930B
Game with String
implementation
,
probabilities
,
strings
1600
x2587
928D
Autocompletion
*special problem
,
strings
,
trees
1900
x800
928A
Login Verification
*special problem
,
strings
1200
x3331
923D
Picking Strings
constructive algorithms
,
implementation
,
strings
2500
x1154
923C
Perfect Security
data structures
,
greedy
,
strings
,
trees
1800
x4146
918B
Radio Station
implementation
,
strings
900
x15624
917E
Upside Down
data structures
,
string suffix structures
,
strings
,
trees
3400
x121
914F
Substrings in a String
bitmasks
,
brute force
,
data structures
,
string suffix structures
,
strings
3000
x1418
906E
Reverses
dp
,
string suffix structures
,
strings
3300
x427
906A
Shockers
implementation
,
strings
1600
x4088
903E
Swapping Characters
brute force
,
hashing
,
implementation
,
strings
2200
x1253
900E
Maximum Questions
data structures
,
dp
,
strings
2100
x1027
899F
Letters Removing
data structures
,
strings
2100
x1571
898C
Phone Numbers
implementation
,
strings
1400
x5127
895D
String Mark
combinatorics
,
math
,
strings
2100
x1086
883H
Palindromic Cut
brute force
,
implementation
,
strings
1800
x1564
883E
Field of Wonders
implementation
,
strings
1500
x1876
877A
Alex and broken contest
implementation
,
strings
1100
x10687
873F
Forbidden Indices
dsu
,
string suffix structures
,
strings
2400
x1287
868D
Huge Strings
bitmasks
,
brute force
,
dp
,
implementation
,
strings
2200
x890
868A
Bark to Unlock
brute force
,
implementation
,
strings
900
x8509
864B
Polycarp and Letters
brute force
,
implementation
,
strings
1000
x8868
862F
Mahmoud and Ehab and the final stage
data structures
,
strings
2900
x197
856B
Similar Words
dp
,
hashing
,
strings
,
trees
2300
x475
855A
Tom Riddle's Diary
brute force
,
implementation
,
strings
800
x20051
844A
Diversity
greedy
,
implementation
,
strings
1000
x10354
835D
Palindromic characteristics
brute force
,
dp
,
hashing
,
strings
1900
x3887
832B
Petya and Exam
implementation
,
strings
1600
x4326
831B
Keyboard Layouts
implementation
,
strings
800
x14051
827E
Rusty String
fft
,
math
,
strings
2700
x788
827C
DNA Evolution
data structures
,
strings
2100
x1612
827A
String Reconstruction
data structures
,
greedy
,
sortings
,
strings
1700
x3936
825F
String Compression
dp
,
hashing
,
string suffix structures
,
strings
2400
x1319
822B
Crossword solving
brute force
,
implementation
,
strings
1000
x9314
814C
An impassioned circulation of affection
brute force
,
dp
,
strings
,
two pointers
1600
x6292
808G
Anthem of Berland
dp
,
strings
2300
x2396
802H
Fake News (medium)
constructive algorithms
,
strings
2200
x426
802G
Fake News (easy)
implementation
,
strings
800
x6689
801B
Valued Keys
constructive algorithms
,
greedy
,
strings
900
x10002
798B
Mike and strings
brute force
,
dp
,
strings
1300
x8258
798A
Mike and palindrome
brute force
,
constructive algorithms
,
strings
1000
x21023
797C
Minimal string
data structures
,
greedy
,
strings
1700
x6240
786D
Rap God
data structures
,
dfs and similar
,
hashing
,
strings
,
trees
3400
x136
785A
Anton and Polyhedrons
implementation
,
strings
800
x81840
780D
Innokenty and a Football League
2-sat
,
graphs
,
greedy
,
implementation
,
shortest paths
,
strings
1900
x2840
778C
Peterson Polyglot
brute force
,
dfs and similar
,
dsu
,
hashing
,
strings
,
trees
2500
x852
778A
String Game
binary search
,
greedy
,
strings
1700
x11071
777D
Cloud of Hashtags
binary search
,
greedy
,
implementation
,
strings
1800
x4909
776A
A Serial Killer
brute force
,
implementation
,
strings
900
x11817
774K
Stepan and Vowels
*special problem
,
implementation
,
strings
1600
x1256
766C
Mahmoud and a Message
brute force
,
dp
,
greedy
,
strings
1700
x4311
766A
Mahmoud and Longest Uncommon Subsequence
constructive algorithms
,
strings
1000
x28701
765B
Code obfuscation
greedy
,
implementation
,
strings
1100
x7015
762C
Two strings
binary search
,
hashing
,
strings
,
two pointers
2100
x2352
758D
Ability To Convert
constructive algorithms
,
dp
,
greedy
,
math
,
strings
2000
x2682
757C
Felicity is Coming!
data structures
,
hashing
,
sortings
,
strings
1900
x2306
755B
PolandBall and Game
binary search
,
data structures
,
games
,
greedy
,
sortings
,
strings
1100
x10907
754E
Dasha and cyclic table
bitmasks
,
brute force
,
fft
,
strings
,
trees
2600
x479
754C
Vladik and chat
brute force
,
constructive algorithms
,
dp
,
implementation
,
strings
2200
x903
748B
Santa Claus and Keyboard Check
implementation
,
strings
1500
x5269
747E
Comments
dfs and similar
,
expression parsing
,
implementation
,
strings
1700
x1937
747B
Mammoth's Genome Decoding
implementation
,
strings
900
x8528
746B
Decoding
implementation
,
strings
900
x26128
745A
Hongcow Learns the Cyclic Shift
implementation
,
strings
900
x10290
744E
Hongcow Masters the Cyclic Shift
strings
,
two pointers
3200
x132
735A
Ostap and Grasshopper
implementation
,
strings
800
x12275
734A
Anton and Danik
implementation
,
strings
800
x139426
731A
Night at the Museum
implementation
,
strings
800
x42975
729A
Interview with Oleg
implementation
,
strings
900
x7253
727E
Games on a CD
data structures
,
hashing
,
string suffix structures
,
strings
2300
x1112
727B
Bill Total Value
expression parsing
,
implementation
,
strings
1600
x1964
725C
Hidden Word
brute force
,
constructive algorithms
,
implementation
,
strings
1600
x2584
724D
Dense Subsequence
data structures
,
greedy
,
strings
1900
x2249
723B
Text Document Analysis
expression parsing
,
implementation
,
strings
1100
x9989
722D
Generating Sets
binary search
,
data structures
,
dfs and similar
,
greedy
,
strings
,
trees
1900
x3073
722B
Verse Pattern
implementation
,
strings
1200
x6342
721B
Passwords
implementation
,
math
,
sortings
,
strings
1100
x11965
712B
Memory and Trident
implementation
,
strings
1100
x9602
710F
String Set Queries
brute force
,
data structures
,
hashing
,
interactive
,
string suffix structures
,
strings
2400
x1667
708A
Letters Cyclic Shift
constructive algorithms
,
greedy
,
implementation
,
strings
1200
x8845
706C
Hard problem
dp
,
strings
1600
x15588
701C
They Are Everywhere
binary search
,
strings
,
two pointers
1500
x13650
700E
Cool Slogans
string suffix structures
,
strings
3300
x1121
697B
Barnicle
brute force
,
implementation
,
math
,
strings
1400
x5662
696D
Legen...
data structures
,
dp
,
matrices
,
strings
2500
x1217
691C
Exponential notation
implementation
,
strings
1800
x2474
691B
s-palindrome
implementation
,
strings
1600
x4698
682D
Alyona and Strings
dp
,
strings
1900
x3171
677C
Vanya and Label
bitmasks
,
combinatorics
,
implementation
,
strings
1500
x6271
676C
Vasya and String
binary search
,
dp
,
strings
,
two pointers
1500
x18000
672B
Different is Good
constructive algorithms
,
implementation
,
strings
1000
x17041
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