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Before contest
Codeforces Round 1097 (Div. 1, Based on Zhili Cup 2026)
2 days
Register now »
*has extra registration
Before contest
Codeforces Round 1097 (Div. 2, Based on Zhili Cup 2026)
2 days
Register now »
*has extra registration
→ Filter Problems
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bitmasks
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
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shortest paths
sortings
string suffix structures
strings
ternary search
trees
two pointers
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Problems
#
Name
2225D
Exceptional Segments
bitmasks
,
brute force
,
math
x6542
2222E
Seek the Truth
binary search
,
bitmasks
,
constructive algorithms
,
interactive
x1912
2219B2
Unique Values (Hard version)
binary search
,
bitmasks
,
constructive algorithms
,
interactive
x3180
2218E
The 67th XOR Problem
binary search
,
bitmasks
,
brute force
1200
x13936
2217F
Interval Game
bitmasks
,
combinatorics
,
constructive algorithms
,
dp
,
games
,
games
,
greedy
,
greedy
,
math
,
probabilities
2300
x691
2215D
EXPloration, EXPloitation, and Gain Some EXPerience!
bitmasks
,
brute force
,
dp
,
greedy
,
implementation
2800
x111
2215C
Oriented Journey
bitmasks
,
brute force
,
communication
,
constructive algorithms
,
graphs
,
interactive
,
trees
2200
x612
2214C
And?
*special problem
,
bitmasks
x1812
2211D
AND-array
bitmasks
,
combinatorics
,
math
1900
x2882
2205G
Simons and Diophantus Equation
bitmasks
,
brute force
,
data structures
,
math
,
number theory
3000
x203
2203C
Test Generator
binary search
,
bitmasks
,
greedy
,
math
1500
x6993
2203B
Beautiful Numbers
bitmasks
,
dp
,
fft
,
greedy
,
math
1000
x14229
2200B
Deletion Sort
bitmasks
,
brute force
,
greedy
,
sortings
800
x25410
2196E2
Fuzzy Concatenation (Hard version)
binary search
,
bitmasks
,
data structures
,
dp
,
greedy
,
string suffix structures
3000
x198
2196E1
Fuzzy Concatenation (Easy Version)
binary search
,
bitmasks
,
brute force
,
data structures
,
greedy
,
string suffix structures
2900
x282
2194F2
Again Trees... (hard version)
bitmasks
,
data structures
,
dfs and similar
,
dp
,
fft
,
trees
3000
x167
2194F1
Again Trees... (Easy Version)
bitmasks
,
dfs and similar
,
dp
,
trees
2300
x885
2194C
Secret message
bitmasks
,
brute force
,
dp
,
math
,
number theory
1300
x10877
2190F
Xor Product
bitmasks
,
dp
3300
x92
2189C2
XOR-convenience (Hard Version)
bitmasks
,
constructive algorithms
,
math
1800
x6203
2189C1
XOR Convenience (Easy Version)
bitmasks
,
constructive algorithms
,
math
1300
x13885
2187D
Cool Problem
bitmasks
,
dp
,
math
2600
x634
2187B
Shortest Statement Ever
bitmasks
,
constructive algorithms
,
dp
,
greedy
1800
x5276
2182F2
Christmas Reindeer (hard version)
bitmasks
,
brute force
,
combinatorics
,
data structures
,
greedy
,
math
2500
x1093
2182F1
Christmas Reindeer (easy version)
bitmasks
,
brute force
,
combinatorics
,
dp
,
math
2300
x1269
2180G
Balance
bitmasks
,
combinatorics
,
implementation
,
math
3500
x134
2180E
No Effect XOR
bitmasks
,
divide and conquer
,
dp
,
greedy
,
math
2300
x1737
2180C
XOR-factorization
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
number theory
1900
x6458
2179H
Blackslex and Plants
bitmasks
,
data structures
,
dp
,
implementation
,
math
2200
x1301
2179D
Blackslex and Penguin Civilization
bitmasks
,
constructive algorithms
,
greedy
,
math
1300
x13500
2178I
Numbers or Fireworks
bitmasks
,
combinatorics
,
dp
,
graphs
3300
x219
2178H
Create or Duplicate
bitmasks
,
graphs
,
number theory
,
shortest paths
3300
x311
2178G
deCH OR Dations
bitmasks
,
data structures
,
dp
,
hashing
,
probabilities
2800
x593
2176F
Omega Numbers
bitmasks
,
combinatorics
,
dp
,
math
,
number theory
2400
x1487
2176B
Optimal Shifts
bitmasks
,
greedy
,
strings
1000
x22888
2173D
Taiga's Carry Chains
bitmasks
,
brute force
,
dp
,
greedy
,
math
1900
x3630
2171G
Sakura Adachi and Optimal Sequences
bitmasks
,
combinatorics
,
greedy
,
math
2000
x2321
2171C2
Renako Amaori and XOR Game (hard version)
bitmasks
,
games
,
greedy
1400
x11830
2171C1
Renako Amaori and XOR Game (easy version)
bitmasks
,
games
,
greedy
1100
x19221
2170F
Build XOR on a Segment
bitmasks
,
dp
2600
x777
2170A
Maximum Neighborhood
bitmasks
,
brute force
,
greedy
,
implementation
,
math
800
x19886
2168C
Intercepting Butterflies
bitmasks
,
communication
,
constructive algorithms
,
graphs
,
interactive
x876
2168A2
Encode and Decode (Hard Version)
bitmasks
,
communication
,
interactive
,
math
x3303
2165C
Binary Wine
bitmasks
,
greedy
,
math
2000
x3515
2163E
Plegma
bitmasks
,
combinatorics
,
communication
,
interactive
2700
x636
2162C
Beautiful XOR
bitmasks
,
constructive algorithms
,
greedy
1100
x21311
2161G
Bitwise And Equals
bitmasks
,
greedy
3500
x91
2160C
Reverse XOR
bitmasks
1300
x15147
2157G
Isaac's Queries
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
divide and conquer
,
dp
,
greedy
,
interactive
,
math
,
probabilities
2800
x411
2156D
Find the Last Number
binary search
,
bitmasks
,
constructive algorithms
,
interactive
1900
x5369
2153F
Odd Queries on Odd Array
bitmasks
,
brute force
,
data structures
,
implementation
,
trees
2900
x323
2153B
Bitwise Reversion
bitmasks
,
greedy
800
x22581
2147E
Maximum OR Popcount
binary search
,
bitmasks
,
brute force
,
data structures
,
greedy
2300
x2117
2146D2
Max Sum OR (Hard Version)
bitmasks
,
constructive algorithms
,
divide and conquer
,
greedy
2000
x4032
2146D1
Max Sum OR (Easy Version)
bitmasks
,
constructive algorithms
,
divide and conquer
,
greedy
,
trees
1500
x10449
2143F
Increasing Xor
bitmasks
,
data structures
,
math
2700
x422
2140E2
Prime Gaming (Hard Version)
bitmasks
,
combinatorics
,
dp
,
probabilities
2500
x1237
2140E1
Prime Gaming (Easy Version)
bitmasks
,
combinatorics
,
dp
2200
x2108
2138C2
Maple and Tree Beauty (Hard Version)
bitmasks
,
brute force
,
dfs and similar
,
dp
,
fft
,
trees
2000
x3366
2138A
Cake Assignment
bitmasks
,
constructive algorithms
,
greedy
1100
x16991
2135C
By the Assignment
binary search
,
bitmasks
,
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
math
2000
x3881
2131G
Wafu!
bitmasks
,
brute force
,
data structures
,
dfs and similar
,
dp
,
math
2000
x3770
2129C3
Interactive RBS (Hard Version)
binary search
,
bitmasks
,
constructive algorithms
,
dp
,
interactive
2300
x1663
2129C2
Interactive RBS (Medium Version)
binary search
,
bitmasks
,
constructive algorithms
,
interactive
2000
x2502
2129C1
Interactive RBS (Easy Version)
binary search
,
bitmasks
,
constructive algorithms
,
interactive
1900
x3856
2127G2
Inter Active (Hard Version)
binary search
,
bitmasks
,
constructive algorithms
,
graphs
,
implementation
,
interactive
,
math
,
probabilities
3500
x107
2125C
Count Good Numbers
bitmasks
,
combinatorics
,
math
,
number theory
1100
x22740
2119E
And Constraint
bitmasks
,
dp
,
greedy
2600
x705
2119C
A Good Problem
bitmasks
,
constructive algorithms
,
math
1300
x16288
2119A
Add or XOR
bitmasks
,
greedy
,
math
800
x27186
2118C
Make It Beautiful
bitmasks
,
data structures
,
greedy
,
math
1300
x18462
2115D
Gellyfish and Forget-Me-Not
bitmasks
,
dp
,
games
,
greedy
,
math
2900
x1101
2111G
Divisible Subarrays
binary search
,
bitmasks
,
brute force
,
data structures
,
interactive
2900
x398
2109C1
Hacking Numbers (Easy Version)
bitmasks
,
constructive algorithms
,
interactive
,
math
,
number theory
1500
x11416
2109B
Slice to Survive
bitmasks
,
greedy
,
math
1200
x17330
2108B
SUMdamental Decomposition
bitmasks
,
constructive algorithms
,
greedy
,
implementation
,
math
1300
x14540
2103F
Maximize Nor
bitmasks
,
data structures
,
dp
,
implementation
,
sortings
2600
x618
2097D
Homework
bitmasks
,
math
,
matrices
2800
x554
2096H
Wonderful XOR Problem
bitmasks
,
combinatorics
,
dp
,
fft
,
math
3200
x223
2096G
Wonderful Guessing Game
bitmasks
,
constructive algorithms
,
interactive
3200
x421
2094E
Boneca Ambalabu
bitmasks
1200
x18557
2093G
Shorten the Array
binary search
,
bitmasks
,
data structures
,
dfs and similar
,
greedy
,
strings
,
trees
,
two pointers
1900
x3801
2093F
Hackers and Neural Networks
bitmasks
,
brute force
,
greedy
1800
x5881
2093D
Skibidi Table
bitmasks
,
implementation
1400
x12268
2086E
Zebra-like Numbers
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
math
2400
x1664
2085C
Serval and The Formula
bitmasks
,
constructive algorithms
,
dp
,
greedy
1600
x13555
2081C
Quaternary Matrix
bitmasks
,
constructive algorithms
,
greedy
,
implementation
,
matrices
2700
x353
2081A
Math Division
bitmasks
,
dp
,
math
,
probabilities
1800
x4078
2077G
RGB Walking
bitmasks
,
chinese remainder theorem
,
dfs and similar
,
graphs
,
number theory
3500
x135
2077F
AND x OR
bitmasks
,
constructive algorithms
,
dp
3300
x261
2077B
Finding OR Sum
bitmasks
,
constructive algorithms
,
implementation
,
interactive
,
math
1900
x3654
2075E
XOR Matrix
bitmasks
,
combinatorics
,
dp
,
implementation
,
math
2500
x1184
2075D
Equalization
bitmasks
,
brute force
,
dp
,
graphs
,
math
2000
x5824
2074F
Counting Necessary Nodes
bitmasks
,
divide and conquer
,
greedy
,
implementation
,
math
2000
x2474
2074C
XOR and Triangle
bitmasks
,
brute force
,
geometry
,
greedy
,
probabilities
1100
x21968
2072F
Goodbye, Banker Life
2-sat
,
bitmasks
,
combinatorics
,
constructive algorithms
,
fft
,
math
,
number theory
1700
x8440
2072C
Creating Keys for StORages Has Become My Main Skill
bitmasks
,
constructive algorithms
,
greedy
1200
x19564
2071D2
Infinite Sequence (Hard Version)
bitmasks
,
brute force
,
constructive algorithms
,
data structures
,
dp
,
implementation
,
math
2500
x1100
2071D1
Infinite Sequence (Easy Version)
bitmasks
,
brute force
,
dp
,
implementation
,
math
1800
x6691
2070F
Friends and Pizza
bitmasks
,
divide and conquer
,
dp
,
fft
3000
x369
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