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Problems
#
Name
1027A
Palindromic Twist
implementation
,
strings
1000
x18799
1025E
Colored Cubes
constructive algorithms
,
implementation
,
matrices
2700
x619
1025C
Plasticine zebra
constructive algorithms
,
implementation
1600
x6491
1025A
Doggo Recoloring
implementation
,
sortings
900
x16523
1023A
Single Wildcard Pattern Matching
brute force
,
implementation
,
strings
1200
x9263
1017B
The Bits
implementation
,
math
1200
x9623
1017A
The Rank
implementation
800
x21583
1016C
Vasya And The Mushrooms
dp
,
implementation
1800
x3991
1016B
Segment Occurrences
brute force
,
implementation
1300
x10149
1016A
Death Note
greedy
,
implementation
,
math
900
x15969
1015B
Obtaining the String
implementation
1200
x12411
1015A
Points in Segments
implementation
800
x22434
1012F
Passports
dp
,
implementation
3400
x207
1012A
Photo of The Sky
brute force
,
implementation
,
math
,
sortings
1500
x6689
1011B
Planning The Expedition
binary search
,
brute force
,
implementation
1200
x11026
1011A
Stages
greedy
,
implementation
,
sortings
900
x13262
1010D
Mars rover
dfs and similar
,
graphs
,
implementation
,
trees
2000
x2563
1009B
Minimum Ternary String
greedy
,
implementation
1400
x10719
1009A
Game Shopping
implementation
800
x12310
1008A
Romaji
implementation
,
strings
900
x16359
1006D
Two Strings Swaps
implementation
1700
x6477
1006B
Polycarp's Practice
greedy
,
implementation
,
sortings
1200
x14655
1006A
Adjacent Replacements
implementation
800
x22872
1005C
Summarize to the Power of Two
brute force
,
greedy
,
implementation
1300
x13050
1005B
Delete from the Left
brute force
,
implementation
,
strings
900
x27371
1005A
Tanya and Stairways
implementation
800
x27443
1004D
Sonya and Matrix
brute force
,
constructive algorithms
,
implementation
2300
x1499
1004C
Sonya and Robots
constructive algorithms
,
implementation
1400
x7880
1004B
Sonya and Exhibition
constructive algorithms
,
greedy
,
implementation
,
math
1300
x9935
1004A
Sonya and Hotels
implementation
900
x11853
1003C
Intense Heat
brute force
,
implementation
,
math
1300
x11525
1003A
Polycarp's Pockets
implementation
800
x29975
1000C
Covered Points Count
data structures
,
implementation
,
sortings
1700
x8431
1000A
Codehorses T-shirts
greedy
,
implementation
1200
x9367
999D
Equalize the Remainders
data structures
,
greedy
,
implementation
1900
x4897
999C
Alphabetic Removals
implementation
1200
x20983
999B
Reversing Encryption
implementation
900
x19432
999A
Mishka and Contest
brute force
,
implementation
800
x25323
998A
Balloons
constructive algorithms
,
implementation
1000
x10107
997A
Convert to Ones
brute force
,
greedy
,
implementation
,
math
1500
x8662
995B
Suit and Tie
greedy
,
implementation
,
math
1400
x7444
995A
Tesla
constructive algorithms
,
implementation
2100
x1807
994B
Knights of a Polygonal Table
greedy
,
implementation
,
sortings
1400
x6045
994A
Fingerprints
implementation
800
x15211
993A
Two Squares
geometry
,
implementation
1600
x4461
992D
Nastya and a Game
brute force
,
implementation
,
math
2100
x1751
992A
Nastya and an Array
implementation
,
sortings
800
x14315
991F
Concise and clear
brute force
,
greedy
,
implementation
,
math
2700
x340
991C
Candies
binary search
,
implementation
1500
x11509
991A
If at first you don't succeed...
implementation
1000
x11232
990D
Graph And Its Complement
constructive algorithms
,
graphs
,
implementation
1700
x4115
990C
Bracket Sequences Concatenation Problem
implementation
1500
x6293
990A
Commentary Boxes
implementation
,
math
1000
x11209
989A
A Blend of Springtime
implementation
,
strings
900
x11161
988C
Equal Sums
implementation
,
sortings
1400
x11135
988A
Diverse Team
brute force
,
implementation
800
x28487
987C
Three displays
brute force
,
dp
,
implementation
1400
x15058
987A
Infinity Gauntlet
implementation
800
x17501
985B
Switches and Lamps
implementation
1200
x7879
985A
Chess Placing
implementation
1100
x8424
984B
Minesweeper
implementation
1100
x7978
983A
Finite or not?
implementation
,
math
1700
x4780
982B
Bus of Characters
data structures
,
greedy
,
implementation
1300
x8947
981C
Useful Decomposition
implementation
,
trees
1400
x6856
981A
Antipalindrome
brute force
,
implementation
,
strings
900
x10327
980A
Links and Pearls
implementation
,
math
900
x10950
978G
Petya's Exams
greedy
,
implementation
,
sortings
1700
x4881
978F
Mentors
binary search
,
data structures
,
implementation
1500
x9218
978D
Almost Arithmetic Progression
brute force
,
implementation
,
math
1500
x9952
978C
Letters
binary search
,
implementation
,
two pointers
1000
x29811
978A
Remove Duplicates
implementation
800
x30725
977B
Two-gram
implementation
,
strings
900
x49742
977A
Wrong Subtraction
implementation
800
x217379
976D
Degree Set
constructive algorithms
,
graphs
,
implementation
2500
x762
976C
Nested Segments
greedy
,
implementation
,
sortings
1500
x10625
976B
Lara Croft and the New Game
implementation
,
math
1300
x6045
976A
Minimum Binary Number
implementation
800
x10974
975B
Mancala
brute force
,
implementation
1100
x7110
975A
Aramic script
implementation
,
strings
900
x10276
967A
Mind the Gap
implementation
1100
x4641
965B
Battleship
implementation
1300
x4767
962D
Merge Equals
data structures
,
implementation
1600
x7362
962C
Make a Square
brute force
,
implementation
,
math
1400
x8357
962B
Students in Railway Carriage
constructive algorithms
,
greedy
,
implementation
1300
x8030
962A
Equator
implementation
1300
x13431
961C
Chessboard
bitmasks
,
brute force
,
implementation
1400
x5636
961B
Lecture Sleep
data structures
,
dp
,
implementation
,
two pointers
1200
x26329
961A
Tetris
implementation
900
x10850
960D
Full Binary Tree Queries
brute force
,
implementation
,
trees
2100
x1946
960C
Subsequence Counting
bitmasks
,
constructive algorithms
,
greedy
,
implementation
1700
x4108
960A
Check the string
implementation
1200
x8786
959E
Mahmoud and Ehab and the xor-MST
bitmasks
,
dp
,
graphs
,
implementation
,
math
1900
x3765
959B
Mahmoud and Ehab and the message
dsu
,
greedy
,
implementation
1200
x10554
958F1
Lightsabers (easy)
implementation
1500
x1816
958B1
Maximum Control (easy)
implementation
1000
x3925
958A1
Death Stars (easy)
implementation
1400
x1853
957A
Tritonic Iridescence
implementation
1300
x5996
955B
Not simply beatiful strings
implementation
1400
x5162
954C
Matrix Walk
implementation
1700
x3957
954B
String Typing
implementation
,
strings
1400
x7789
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Before contest
Codeforces Round 1097 (Div. 1, Based on Zhili Cup 2026)
2 days
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Before contest
Codeforces Round 1097 (Div. 2, Based on Zhili Cup 2026)
2 days
Register now »
*has extra registration
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implementation
combine-tags-by-or
*combine tags by OR
2-sat
binary search
bitmasks
brute force
chinese remainder theorem
combinatorics
communication
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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