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Problems
#
Name
648A
Наибольший подъем
constructive algorithms
,
implementation
900
x1054
645A
Amity Assessment
brute force
,
constructive algorithms
,
implementation
1200
x3781
644C
Hostname Aliases
*special problem
,
binary search
,
data structures
,
implementation
,
sortings
,
strings
2100
x1001
643A
Bear and Colors
implementation
1500
x4817
641D
Little Artem and Random Variable
dp
,
implementation
,
math
,
probabilities
2400
x1575
641C
Little Artem and Dance
brute force
,
constructive algorithms
,
implementation
1800
x3190
641B
Little Artem and Matrix
implementation
1400
x4390
641A
Little Artem and Grasshopper
implementation
1000
x6321
639C
Bear and Polynomials
hashing
,
implementation
,
math
2200
x1253
639A
Bear and Displayed Friends
implementation
1200
x6413
637C
Promocodes with Mistakes
*special problem
,
brute force
,
constructive algorithms
,
implementation
1400
x2525
637A
Voting for Photos
*special problem
,
constructive algorithms
,
implementation
1000
x5831
635A
Orchestra
brute force
,
implementation
1100
x3202
634A
Island Puzzle
constructive algorithms
,
implementation
1300
x3453
633H
Fibonacci-ish II
data structures
,
implementation
3100
x695
633D
Fibonacci-ish
brute force
,
dp
,
hashing
,
implementation
,
math
2000
x3051
633C
Spy Syndrome 2
data structures
,
dp
,
hashing
,
implementation
,
sortings
,
string suffix structures
,
strings
1900
x3373
631D
Messenger
data structures
,
hashing
,
implementation
,
string suffix structures
,
strings
2100
x2389
631B
Print Check
constructive algorithms
,
implementation
1200
x7871
631A
Interview
brute force
,
implementation
900
x9746
630L
Cracking the Code
implementation
,
math
1400
x4049
629A
Far Relative’s Birthday Cake
brute force
,
combinatorics
,
constructive algorithms
,
implementation
800
x14845
628E
Zbazi in Zeydabad
data structures
,
implementation
2300
x1086
628A
Tennis Tournament
implementation
,
math
1000
x7077
626A
Robot Sequence
brute force
,
implementation
1000
x6700
625D
Finals in arithmetic
constructive algorithms
,
implementation
,
math
2400
x679
625C
K-special Tables
constructive algorithms
,
implementation
1300
x7169
625A
Guest From the Past
implementation
,
math
1700
x5664
622C
Not Equal on a Segment
data structures
,
implementation
1700
x7524
622B
The Time
implementation
900
x10957
622A
Infinite Sequence
implementation
,
math
1000
x10252
621B
Wet Shark and Bishops
combinatorics
,
implementation
1300
x11614
621A
Wet Shark and Odd and Even
implementation
900
x22672
620B
Grandfather Dovlet’s calculator
implementation
1000
x10508
620A
Professor GukiZ's Robot
implementation
,
math
800
x14347
618C
Constellation
geometry
,
implementation
1600
x4655
618A
Slime Combining
implementation
800
x8805
617D
Polyline
constructive algorithms
,
implementation
1700
x4437
617C
Watering Flowers
implementation
1600
x5234
616E
Sum of Remainders
implementation
,
math
,
number theory
2200
x3499
616A
Comparing Two Long Integers
implementation
,
strings
900
x10823
615E
Hexagons
binary search
,
implementation
,
math
2100
x1061
615A
Bulbs
implementation
800
x19718
614B
Gena's Code
implementation
,
math
1400
x7293
614A
Link/Cut Tree
brute force
,
implementation
1500
x7801
612B
HDD is Outdated Technology
implementation
,
math
1200
x7603
612A
The Text Splitting
brute force
,
implementation
,
strings
1300
x7838
611F
New Year and Cleaning
binary search
,
implementation
2500
x522
611C
New Year and Domino
dp
,
implementation
1500
x9006
611B
New Year and Old Property
bitmasks
,
brute force
,
implementation
1300
x11059
611A
New Year and Days
implementation
900
x12176
610B
Vika and Squares
constructive algorithms
,
implementation
1300
x8332
609C
Load Balancing
implementation
,
math
1500
x7391
609B
The Best Gift
constructive algorithms
,
implementation
1100
x10088
609A
USB Flash Drives
greedy
,
implementation
,
sortings
800
x19416
608A
Saitama Destroys Hotel
implementation
,
math
1000
x9909
606B
Testing Robots
implementation
1600
x2833
606A
Magic Spheres
implementation
1200
x8236
604A
Uncowed Forces
implementation
1000
x9374
602B
Approximating a Constant Range
dp
,
implementation
,
two pointers
1400
x12069
602A
Two Bases
brute force
,
implementation
1100
x8796
600A
Extract Numbers
implementation
,
strings
1600
x5810
599B
Spongebob and Joke
implementation
1500
x4578
599A
Patrick and Shopping
implementation
800
x31435
598B
Queries on a String
implementation
,
strings
1300
x12199
596B
Wilbur and Array
greedy
,
implementation
1100
x10891
596A
Wilbur and Swimming Pool
geometry
,
implementation
1100
x8091
595A
Vitaly and Night
constructive algorithms
,
implementation
800
x15502
594C
Edo and Magnets
brute force
,
greedy
,
implementation
,
two pointers
2300
x759
593A
2Char
brute force
,
implementation
1200
x6156
592A
PawnChess
implementation
1200
x6525
591B
Rebranding
implementation
,
strings
1200
x8644
591A
Wizards' Duel
implementation
,
math
900
x17275
590A
Median Smoothing
implementation
1700
x4283
586B
Laurenty and Shop
implementation
1300
x5239
586A
Alena's Schedule
implementation
900
x10590
585F
Digits of Number Pi
dp
,
implementation
,
strings
3200
x797
585A
Gennady the Dentist
brute force
,
implementation
1800
x4476
583B
Robot's Task
greedy
,
implementation
1200
x8989
583A
Asphalting Roads
implementation
1000
x11758
581D
Three Logos
bitmasks
,
brute force
,
constructive algorithms
,
geometry
,
implementation
,
math
1700
x4696
581C
Developing Skills
implementation
,
math
,
sortings
1400
x7594
581B
Luxurious Houses
implementation
,
math
1100
x13645
581A
Vasya the Hipster
implementation
,
math
800
x84920
580A
Kefa and First Steps
brute force
,
dp
,
implementation
900
x104639
579B
Finding Team Member
brute force
,
implementation
,
sortings
1300
x5451
577A
Multiplication Table
implementation
,
number theory
1000
x45277
575D
Tablecity
constructive algorithms
,
implementation
1700
x1984
574A
Bear and Elections
greedy
,
implementation
1200
x9521
573A
Bear and Poker
implementation
,
math
,
number theory
1300
x18200
572B
Order Book
data structures
,
greedy
,
implementation
,
sortings
1300
x8182
571A
Lengthening Sticks
combinatorics
,
implementation
,
math
2100
x2680
570C
Replacement
constructive algorithms
,
data structures
,
implementation
1600
x9570
570B
Simple Game
constructive algorithms
,
games
,
greedy
,
implementation
,
math
1300
x16876
570A
Elections
implementation
1100
x14331
569A
Music
implementation
,
math
1500
x5062
568A
Primes or Palindromes?
brute force
,
implementation
,
math
,
number theory
1600
x5400
567B
Berland National Library
implementation
1300
x8699
567A
Lineland Mail
greedy
,
implementation
900
x35969
560B
Gerald is into Art
constructive algorithms
,
implementation
1200
x8253
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Codeforces Round 1097 (Div. 1, Based on Zhili Cup 2026)
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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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