Enter
|
Register
Home
Top
Catalog
Contests
Gym
Problemset
Groups
Rating
Edu
API
Calendar
Help
Please read
the new rule regarding the restriction on the use of AI tools
.
×
→ Pay attention
Before contest
Codeforces Round (Div. 2)
4 days
Register now »
*has extra registration
→ Filter Problems
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
Add tag
Main
acmsguru
|
Problems
Submit
Status
Standings
Custom test
Problems
#
Name
1065E
Side Transmutations
combinatorics
,
strings
2300
x1077
1063A
Oh Those Palindromes
constructive algorithms
,
strings
1300
x10348
1056H
Detect Robots
data structures
,
strings
3200
x158
1056E
Check Transcription
brute force
,
data structures
,
hashing
,
strings
2100
x2248
1055F
Tree and XOR
strings
,
trees
2900
x475
1055D
Refactoring
greedy
,
implementation
,
strings
2400
x627
1051E
Vasya and Big Integers
binary search
,
data structures
,
dp
,
hashing
,
strings
2600
x950
1051A
Vasya And Password
greedy
,
implementation
,
strings
1200
x8416
1045J
Moonwalk challenge
data structures
,
strings
,
trees
2600
x170
1045I
Palindrome Pairs
hashing
,
strings
1600
x4432
1043G
Speckled Band
data structures
,
divide and conquer
,
hashing
,
string suffix structures
,
strings
3500
x237
1038F
Wrap Around
dp
,
strings
2900
x329
1038A
Equality
implementation
,
strings
800
x14885
1037C
Equalize
dp
,
greedy
,
strings
1300
x18815
1029A
Many Equal Substrings
implementation
,
strings
1300
x12298
1027A
Palindromic Twist
implementation
,
strings
1000
x16267
1023A
Single Wildcard Pattern Matching
brute force
,
implementation
,
strings
1200
x8677
1017E
The Supersonic Rocket
geometry
,
hashing
,
strings
2400
x1026
1015F
Bracket Substring
dp
,
strings
2300
x1115
1012D
AB-Strings
constructive algorithms
,
strings
2800
x371
1008A
Romaji
implementation
,
strings
900
x15012
1005B
Delete from the Left
brute force
,
implementation
,
strings
900
x23389
1003F
Abbreviation
dp
,
hashing
,
strings
2200
x1356
989B
A Tide of Riverscape
constructive algorithms
,
strings
1200
x7046
989A
A Blend of Springtime
implementation
,
strings
900
x10323
988B
Substrings Sort
sortings
,
strings
1100
x18425
985F
Isomorphic Strings
hashing
,
strings
2300
x1855
981A
Antipalindrome
brute force
,
implementation
,
strings
900
x9269
979D
Kuro and GCD and XOR and SUM
binary search
,
bitmasks
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
math
,
number theory
,
strings
,
trees
2200
x1814
978B
File Name
greedy
,
strings
800
x36215
977B
Two-gram
implementation
,
strings
900
x39193
975A
Aramic script
implementation
,
strings
900
x9248
965E
Short Code
data structures
,
dp
,
greedy
,
strings
,
trees
2200
x1440
963D
Frequency of String
hashing
,
string suffix structures
,
strings
2500
x2017
958A2
Death Stars (medium)
hashing
,
strings
2000
x904
955D
Scissors
brute force
,
strings
2600
x479
954B
String Typing
implementation
,
strings
1400
x7257
946C
String Transformation
greedy
,
strings
1300
x8866
940C
Phone Numbers
constructive algorithms
,
implementation
,
strings
1500
x5857
939D
Love Rescue
dfs and similar
,
dsu
,
graphs
,
greedy
,
strings
1600
x7310
936C
Lock Puzzle
constructive algorithms
,
implementation
,
strings
2300
x1174
932G
Palindrome Partition
dp
,
string suffix structures
,
strings
2900
x928
930B
Game with String
implementation
,
probabilities
,
strings
1600
x2656
928D
Autocompletion
*special problem
,
strings
,
trees
1900
x809
928A
Login Verification
*special problem
,
strings
1200
x3389
923D
Picking Strings
constructive algorithms
,
implementation
,
strings
2500
x1196
923C
Perfect Security
data structures
,
greedy
,
strings
,
trees
1800
x4272
918B
Radio Station
implementation
,
strings
900
x16387
917E
Upside Down
data structures
,
string suffix structures
,
strings
,
trees
3400
x133
914F
Substrings in a String
bitmasks
,
brute force
,
data structures
,
string suffix structures
,
strings
3000
x1633
906E
Reverses
dp
,
string suffix structures
,
strings
3300
x447
906A
Shockers
implementation
,
strings
1600
x4128
903E
Swapping Characters
brute force
,
hashing
,
implementation
,
strings
2200
x1465
900E
Maximum Questions
data structures
,
dp
,
strings
2100
x1261
899F
Letters Removing
data structures
,
strings
2100
x1837
898C
Phone Numbers
implementation
,
strings
1400
x5278
895D
String Mark
combinatorics
,
math
,
strings
2100
x1109
883H
Palindromic Cut
brute force
,
implementation
,
strings
1800
x1614
883E
Field of Wonders
implementation
,
strings
1500
x1898
877A
Alex and broken contest
implementation
,
strings
1100
x10868
873F
Forbidden Indices
dsu
,
string suffix structures
,
strings
2400
x1378
868D
Huge Strings
bitmasks
,
brute force
,
dp
,
implementation
,
strings
2200
x909
868A
Bark to Unlock
brute force
,
implementation
,
strings
900
x8680
864B
Polycarp and Letters
brute force
,
implementation
,
strings
1000
x9105
862F
Mahmoud and Ehab and the final stage
data structures
,
strings
2900
x209
856B
Similar Words
dp
,
hashing
,
strings
,
trees
2300
x499
855A
Tom Riddle's Diary
brute force
,
implementation
,
strings
800
x21531
844A
Diversity
greedy
,
implementation
,
strings
1000
x10927
835D
Palindromic characteristics
brute force
,
dp
,
hashing
,
strings
1900
x4117
832B
Petya and Exam
implementation
,
strings
1600
x4379
831B
Keyboard Layouts
implementation
,
strings
800
x14397
827E
Rusty String
fft
,
math
,
strings
2700
x964
827C
DNA Evolution
data structures
,
strings
2100
x1641
827A
String Reconstruction
data structures
,
greedy
,
sortings
,
strings
1700
x4038
825F
String Compression
dp
,
hashing
,
string suffix structures
,
strings
2400
x1505
822B
Crossword solving
brute force
,
implementation
,
strings
1000
x9517
814C
An impassioned circulation of affection
brute force
,
dp
,
strings
,
two pointers
1600
x6589
808G
Anthem of Berland
dp
,
strings
2300
x2693
802H
Fake News (medium)
constructive algorithms
,
strings
2200
x453
802G
Fake News (easy)
implementation
,
strings
800
x6971
801B
Valued Keys
constructive algorithms
,
greedy
,
strings
900
x10241
798B
Mike and strings
brute force
,
dp
,
strings
1300
x8384
798A
Mike and palindrome
brute force
,
constructive algorithms
,
strings
1000
x21734
797C
Minimal string
data structures
,
greedy
,
strings
1700
x6720
786D
Rap God
data structures
,
dfs and similar
,
hashing
,
strings
,
trees
3400
x142
785A
Anton and Polyhedrons
implementation
,
strings
800
x88457
780D
Innokenty and a Football League
2-sat
,
graphs
,
greedy
,
implementation
,
shortest paths
,
strings
1900
x2900
778C
Peterson Polyglot
brute force
,
dfs and similar
,
dsu
,
hashing
,
strings
,
trees
2500
x888
778A
String Game
binary search
,
greedy
,
strings
1700
x11543
777D
Cloud of Hashtags
binary search
,
greedy
,
implementation
,
strings
1800
x4985
776A
A Serial Killer
brute force
,
implementation
,
strings
900
x12039
774K
Stepan and Vowels
*special problem
,
implementation
,
strings
1600
x1274
766C
Mahmoud and a Message
brute force
,
dp
,
greedy
,
strings
1700
x4393
766A
Mahmoud and Longest Uncommon Subsequence
constructive algorithms
,
strings
1000
x30390
765B
Code obfuscation
greedy
,
implementation
,
strings
1100
x7117
762C
Two strings
binary search
,
hashing
,
strings
,
two pointers
2100
x2548
758D
Ability To Convert
constructive algorithms
,
dp
,
greedy
,
math
,
strings
2000
x2711
757C
Felicity is Coming!
data structures
,
hashing
,
sortings
,
strings
1900
x2341
755B
PolandBall and Game
binary search
,
data structures
,
games
,
greedy
,
sortings
,
strings
1100
x11214
754E
Dasha and cyclic table
bitmasks
,
brute force
,
fft
,
strings
,
trees
2600
x497
←
1
2
3
4
5
6
7
8
→
User lists
Name