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Before contest
Codeforces Round 1097 (Div. 1, Based on Zhili Cup 2026)
4 days
Register now »
*has extra registration
Before contest
Codeforces Round 1097 (Div. 2, Based on Zhili Cup 2026)
4 days
Register now »
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→ Filter Problems
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combinatorics
combine-tags-by-or
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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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Custom test
Problems
#
Name
1326C
Permutation Partitions
combinatorics
,
greedy
,
math
1300
x16395
1312D
Count the Arrays
combinatorics
,
math
1700
x10522
1307E
Cow and Treats
binary search
,
combinatorics
,
dp
,
greedy
,
implementation
,
math
2500
x1363
1305C
Kuroni and Impossible Calculation
brute force
,
combinatorics
,
math
,
number theory
1600
x18765
1301C
Ayoub's function
binary search
,
combinatorics
,
greedy
,
math
,
strings
1700
x9874
1299D
Around the World
bitmasks
,
combinatorics
,
dfs and similar
,
dp
,
graphs
,
graphs
,
math
,
trees
3000
x528
1295F
Good Contest
combinatorics
,
dp
,
probabilities
2700
x1507
1293B
JOE is on TV!
combinatorics
,
greedy
,
math
1000
x22293
1292F
Nora's Toy Boxes
bitmasks
,
combinatorics
,
dp
3500
x370
1292C
Xenon's Attack on the Gangs
combinatorics
,
dfs and similar
,
dp
,
greedy
,
trees
2300
x2252
1288C
Two Arrays
combinatorics
,
dp
1600
x15262
1285F
Classical?
binary search
,
combinatorics
,
number theory
2900
x1345
1284E
New Year and Castle Construction
combinatorics
,
geometry
,
math
,
sortings
2500
x1379
1284C
New Year and Permutation
combinatorics
,
math
1600
x8735
1284B
New Year and Ascent Sequence
binary search
,
combinatorics
,
data structures
,
dp
,
implementation
,
sortings
1400
x11454
1280F
Intergalactic Sliding Puzzle
combinatorics
,
constructive algorithms
,
math
3400
x107
1279E
New Year Permutations
combinatorics
,
dp
2700
x455
1279D
Santa's Bot
combinatorics
,
math
,
probabilities
1700
x7289
1278F
Cards
combinatorics
,
dp
,
math
,
number theory
,
probabilities
2600
x2494
1276C
Beautiful Rectangle
brute force
,
combinatorics
,
constructive algorithms
,
data structures
,
greedy
,
math
2300
x1788
1276B
Two Fairs
combinatorics
,
dfs and similar
,
dsu
,
graphs
1900
x5668
1272C
Yet Another Broken Keyboard
combinatorics
,
dp
,
implementation
1200
x30717
1271E
Common Number
binary search
,
combinatorics
,
dp
,
math
2100
x3712
1267K
Key Storage
combinatorics
,
math
2100
x2142
1264D2
Beautiful Bracket Sequence (hard version)
combinatorics
,
probabilities
2900
x1315
1264D1
Beautiful Bracket Sequence (easy version)
combinatorics
,
dp
,
probabilities
2600
x1525
1254E
Send Tree to Charlie
combinatorics
,
dfs and similar
,
dsu
,
trees
3300
x366
1251F
Red-White Fence
combinatorics
,
fft
2500
x976
1245F
Daniel and Spring Cleaning
bitmasks
,
brute force
,
combinatorics
,
dp
2300
x2263
1239A
Ivan the Fool and the Probability Theory
combinatorics
,
dp
,
math
1700
x7790
1238D
AB-string
binary search
,
combinatorics
,
dp
,
strings
1900
x6442
1237F
Balanced Domino Placements
combinatorics
,
dp
2600
x1092
1236B
Alice and the List of Presents
combinatorics
,
math
1500
x12051
1228E
Another Filling the Grid
combinatorics
,
dp
,
math
2300
x3450
1227F2
Wrong Answer on test 233 (Hard Version)
combinatorics
,
math
2400
x1919
1221G
Graph And Numbers
bitmasks
,
brute force
,
combinatorics
,
dp
,
meet-in-the-middle
2900
x876
1215B
The Number of Products
combinatorics
,
dp
,
implementation
1400
x18326
1207D
Number Of Permutations
combinatorics
1800
x6698
1205E
Expected Value Again
combinatorics
,
strings
3100
x373
1204E
Natasha, Sasha and the Prefix Sums
combinatorics
,
dp
,
math
,
number theory
2300
x2069
1202D
Print a 1337-string...
combinatorics
,
constructive algorithms
,
math
,
strings
1900
x5462
1197E
Culture Code
binary search
,
combinatorics
,
data structures
,
dp
,
shortest paths
,
sortings
2300
x1851
1195D2
Submarine in the Rybinsk Sea (hard edition)
combinatorics
,
math
,
number theory
1800
x4898
1195D1
Submarine in the Rybinsk Sea (easy edition)
combinatorics
,
math
,
number theory
1500
x8197
1194F
Crossword Expert
combinatorics
,
dp
,
number theory
,
probabilities
,
two pointers
2400
x1219
1188E
Problem from Red Panda
combinatorics
3300
x288
1185G2
Playlist for Polycarp (hard version)
combinatorics
,
dp
2600
x919
1185G1
Playlist for Polycarp (easy version)
bitmasks
,
combinatorics
,
dp
2100
x3197
1181C
Flag
brute force
,
combinatorics
,
dp
,
implementation
1900
x3403
1178F1
Short Colorful Strip
combinatorics
,
dfs and similar
,
dp
2200
x2285
1178C
Tiles
combinatorics
,
greedy
,
math
1300
x13220
1174E
Ehab and the Expected GCD Problem
combinatorics
,
dp
,
math
,
number theory
2500
x1774
1172B
Nauuo and Circle
combinatorics
,
dfs and similar
,
dp
,
trees
1900
x4404
1167F
Scalar Queries
combinatorics
,
data structures
,
math
,
sortings
2300
x1889
1167E
Range Deleting
binary search
,
combinatorics
,
data structures
,
two pointers
2100
x2924
1166A
Silent Classroom
combinatorics
,
greedy
900
x15075
1153F
Serval and Bonus Problem
combinatorics
,
dp
,
math
,
probabilities
2600
x929
1151F
Sonya and Informatics
combinatorics
,
dp
,
matrices
,
probabilities
2300
x1457
1151E
Number of Components
combinatorics
,
data structures
,
dp
,
math
2100
x3769
1140E
Palindrome-less Arrays
combinatorics
,
divide and conquer
,
dp
2200
x2112
1118F2
Tree Cutting (Hard Version)
combinatorics
,
dfs and similar
,
dp
,
trees
2700
x632
1111D
Destroy the Colony
combinatorics
,
dp
,
math
2600
x1154
1109D
Sasha and Interesting Fact from Graph Theory
brute force
,
combinatorics
,
dp
,
math
,
trees
2400
x1501
1105C
Ayoub and Lost Array
combinatorics
,
dp
,
math
1500
x11364
1102E
Monotonic Renumeration
combinatorics
,
sortings
1700
x6902
1097G
Vladislav and a Great Legend
combinatorics
,
dp
,
trees
3000
x1053
1097F
Alex and a TV Show
bitmasks
,
combinatorics
,
number theory
2500
x1472
1096E
The Top Scorer
combinatorics
,
dp
,
math
,
probabilities
2500
x1278
1096B
Substring Removal
combinatorics
,
math
,
strings
1300
x11679
1091D
New Year and the Permutation Concatenation
combinatorics
,
dp
,
math
1700
x7473
1089I
Interval-Free Permutations
combinatorics
2600
x459
1085G
Beautiful Matrix
combinatorics
,
data structures
,
dp
2900
x709
1084C
The Fair Nut and String
combinatorics
,
dp
,
implementation
1500
x11642
1081C
Colorful Bricks
combinatorics
,
dp
,
math
1500
x8557
1073E
Segment Sum
bitmasks
,
combinatorics
,
dp
,
math
2300
x3566
1065E
Side Transmutations
combinatorics
,
strings
2300
x1287
1060F
Shrinking Tree
combinatorics
,
dp
2900
x787
1043F
Make It One
bitmasks
,
combinatorics
,
dp
,
math
,
number theory
,
shortest paths
2500
x2992
1043D
Mysterious Crime
brute force
,
combinatorics
,
math
,
meet-in-the-middle
,
two pointers
1700
x4760
1037F
Maximum Reduction
combinatorics
,
data structures
,
math
2500
x1272
1036F
Relatively Prime Powers
combinatorics
,
math
,
number theory
2400
x1858
1036C
Classy Numbers
combinatorics
,
dp
1900
x13350
1034C
Region Separation
combinatorics
,
dp
,
number theory
,
trees
2700
x993
1028D
Order book
combinatorics
,
data structures
,
greedy
2100
x1822
1027E
Inverse Coloring
combinatorics
,
dp
,
math
2100
x2362
1009E
Intercity Travelling
combinatorics
,
math
,
probabilities
2000
x3361
1007B
Pave the Parallelepiped
bitmasks
,
brute force
,
combinatorics
,
math
,
number theory
2400
x1037
1007A
Reorder the Array
combinatorics
,
data structures
,
math
,
sortings
,
two pointers
1300
x13064
1000D
Yet Another Problem On a Subsequence
combinatorics
,
dp
1900
x5038
997D
Cycles in product
combinatorics
,
divide and conquer
,
trees
2900
x517
997C
Sky Full of Stars
combinatorics
,
math
2500
x2176
997B
Roman Digits
brute force
,
combinatorics
,
dp
,
greedy
,
math
2000
x3136
995F
Cowmpany Cowmpensation
combinatorics
,
dp
,
math
,
trees
2700
x1624
991E
Bus Number
brute force
,
combinatorics
,
math
1800
x3727
986B
Petr and Permutations
combinatorics
,
math
1800
x5054
985G
Team Players
combinatorics
2700
x719
981H
K Paths
combinatorics
,
data structures
,
dp
,
fft
,
math
3100
x288
978E
Bus Video System
combinatorics
,
math
1400
x10589
961G
Partitions
combinatorics
,
math
,
number theory
2700
x1610
960G
Bandit Blues
combinatorics
,
dp
,
fft
,
math
2900
x1201
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