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Before contest
Codeforces Round 1097 (Div. 1, Based on Zhili Cup 2026)
32:57:15
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*has extra registration
Before contest
Codeforces Round 1097 (Div. 2, Based on Zhili Cup 2026)
32:57:15
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→ Filter Problems
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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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Problems
#
Name
2171H
Shiori Miyagi and Maximum Array Score
binary search
,
data structures
,
dp
,
sortings
2400
x1014
2171G
Sakura Adachi and Optimal Sequences
bitmasks
,
combinatorics
,
greedy
,
math
2000
x2324
2171F
Rae Taylor and Trees (hard version)
binary search
,
constructive algorithms
,
data structures
,
dp
,
dsu
,
greedy
,
implementation
,
trees
1600
x7122
2171E
Anisphia Wynn Palettia and Good Permutations
constructive algorithms
,
greedy
,
number theory
2000
x3651
2171D
Rae Taylor and Trees (easy version)
binary search
,
data structures
,
dp
,
dsu
,
greedy
,
implementation
,
trees
1400
x11570
2171C2
Renako Amaori and XOR Game (hard version)
bitmasks
,
games
,
greedy
1400
x11839
2170F
Build XOR on a Segment
bitmasks
,
dp
2600
x779
2170E
Binary Strings and Blocks
combinatorics
,
data structures
,
dp
2100
x2318
2170D
Almost Roman
constructive algorithms
,
greedy
,
implementation
2200
x1680
2169F
Subsequence Problem
combinatorics
,
dp
,
fft
,
math
2700
x333
2169E
Points Selection
dp
,
greedy
2400
x1041
2169D2
Removal of a Sequence (Hard Version)
binary search
,
divide and conquer
,
greedy
,
implementation
,
math
,
number theory
2100
x2269
2169D1
Removal of a Sequence (Easy Version)
binary search
,
implementation
,
math
,
number theory
1500
x8538
2167G
Mukhammadali and the Smooth Array
data structures
,
dp
1600
x11014
2167F
Tree, TREE!!!
dfs and similar
,
dp
,
math
,
trees
1600
x7129
2167E
khba Loves to Sleep!
binary search
,
data structures
,
geometry
,
greedy
,
implementation
1600
x9061
2165F
Arctic Acquisition
data structures
,
greedy
3500
x194
2165E
Rainbow Branch
constructive algorithms
,
dp
,
greedy
,
trees
3200
x255
2165D
Path Split
graph matchings
,
greedy
2500
x896
2165C
Binary Wine
bitmasks
,
greedy
,
math
2000
x3517
2165B
Marble Council
dp
,
math
,
sortings
1900
x4532
2164H
PalindromePalindrome
data structures
,
strings
3400
x43
2164G
Pointless Machine
constructive algorithms
,
graphs
,
interactive
,
trees
3300
x203
2164F2
Chain Prefix Rank (Hard Version)
binary search
,
combinatorics
,
data structures
,
dfs and similar
,
dp
,
graphs
,
math
,
trees
2900
x423
2164F1
Chain Prefix Rank (Easy Version)
combinatorics
,
dfs and similar
,
dp
,
math
,
trees
2600
x650
2164E
Journey
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
2300
x1579
2164D
Copy String
greedy
,
implementation
,
strings
,
two pointers
1800
x4960
2164C
Dungeon
binary search
,
brute force
,
data structures
,
greedy
,
sortings
1400
x10695
2163E
Plegma
bitmasks
,
combinatorics
,
communication
,
interactive
2700
x637
2163D2
Diadrash (Hard Version)
binary search
,
interactive
,
math
,
sortings
2500
x1499
2163D1
Diadrash (Easy Version)
binary search
,
brute force
,
divide and conquer
,
implementation
,
interactive
2100
x2728
2163C
Monopati
brute force
,
combinatorics
,
dp
,
math
,
two pointers
1500
x9020
2163B
Siga ta Kymata
constructive algorithms
,
greedy
,
implementation
,
math
1700
x9127
2162H
Beautiful Problem
dp
2900
x314
2162G
Beautiful Tree
constructive algorithms
,
math
,
probabilities
,
trees
2200
x2811
2162F
Beautiful Intervals
constructive algorithms
,
greedy
2100
x2914
2162E
Beautiful Palindromes
constructive algorithms
,
greedy
,
schedules
1600
x9331
2162D
Beautiful Permutation
binary search
,
interactive
1400
x12360
2161H
Cycle Sort
data structures
3500
x63
2161G
Bitwise And Equals
bitmasks
,
greedy
3500
x91
2161F
SubMST
combinatorics
,
graphs
,
trees
3000
x345
2161E
Left is Always Right
combinatorics
,
implementation
,
math
2400
x782
2161D
Locked Out
binary search
,
data structures
,
dp
,
greedy
2100
x2772
2161B
Make Connected
brute force
,
implementation
1700
x5370
2159F
Grand Finale: Snakes
binary search
,
interactive
,
ternary search
3500
x134
2159E
Super-Short-Polynomial-San
math
,
meet-in-the-middle
3500
x201
2159D2
Inverse Minimum Partition (Hard Version)
dp
,
greedy
,
math
3200
x394
2159D1
Inverse Minimum Partition (Easy Version)
binary search
,
brute force
,
dp
,
geometry
,
greedy
,
math
,
two pointers
2500
x1019
2159C
Twin Polynomials
combinatorics
,
graph matchings
,
math
2300
x1687
2159B
Rectangles
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
implementation
,
two pointers
2100
x2308
2159A
MAD Interactive Problem
constructive algorithms
,
implementation
,
interactive
1700
x8129
2158F2
Distinct GCDs (Hard Version)
combinatorics
,
constructive algorithms
,
graphs
,
math
,
number theory
,
number theory
3000
x249
2158F1
Distinct GCDs (Easy Version)
constructive algorithms
,
graphs
,
math
,
number theory
2600
x403
2158E
Sink
data structures
,
divide and conquer
,
dsu
,
graphs
,
implementation
2600
x625
2158D
Palindrome Flipping
brute force
,
constructive algorithms
,
graphs
,
implementation
,
shortest paths
,
strings
2000
x3279
2158C
Annoying Game
dp
,
games
,
greedy
1400
x11056
2157I
Hyper Smawk Bros
dp
,
dp
,
games
3500
x171
2157H
Keygen 3
brute force
,
combinatorics
,
constructive algorithms
,
dfs and similar
,
math
3200
x116
2157G
Isaac's Queries
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
divide and conquer
,
dp
,
greedy
,
interactive
,
math
,
probabilities
2800
x411
2157F
Git Gud
brute force
,
constructive algorithms
,
divide and conquer
,
math
,
ternary search
2400
x1290
2157E
Adjusting Drones
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
implementation
,
sortings
1900
x3568
2157D
Billion Players Game
binary search
,
greedy
,
math
,
sortings
,
ternary search
,
two pointers
1600
x5998
2157C
Meximum Array 2
constructive algorithms
,
greedy
,
implementation
,
math
1400
x9241
2156F2
Strange Operation (Hard Version)
data structures
,
greedy
,
trees
3000
x243
2156F1
Strange Operation (Easy Version)
brute force
,
data structures
,
greedy
,
implementation
,
sortings
2200
x1617
2156E
Best Time to Buy and Sell Stock
binary search
,
brute force
,
data structures
,
dp
,
games
,
graphs
,
greedy
2500
x960
2156D
Find the Last Number
binary search
,
bitmasks
,
constructive algorithms
,
interactive
1900
x5370
2156C
Maximum GCD on Whiteboard
greedy
,
math
,
number theory
1400
x12274
2155F
Juan's Colorful Tree
data structures
,
dfs and similar
,
dfs and similar
,
dsu
,
graphs
,
graphs
,
meet-in-the-middle
,
trees
2800
x637
2155E
Mimo & Yuyu
games
,
greedy
,
math
2200
x2832
2155D
Batteries
brute force
,
constructive algorithms
,
graph matchings
,
graphs
,
interactive
,
math
1800
x5862
2155C
The Ancient Wizards' Capes
brute force
,
greedy
,
implementation
1500
x10248
2154F2
Bombing (Hard Version)
combinatorics
,
dp
3300
x175
2154F1
Bombing (Easy Version)
brute force
,
combinatorics
,
constructive algorithms
,
implementation
,
math
2700
x565
2154E
No Mind To Think
binary search
,
divide and conquer
,
greedy
,
sortings
,
ternary search
,
two pointers
2500
x1202
2154D
Catshock
constructive algorithms
,
dfs and similar
,
graphs
,
trees
,
two pointers
1900
x4762
2154C2
No Cost Too Great (Hard Version)
greedy
,
math
,
number theory
2000
x5509
2154C1
No Cost Too Great (Easy Version)
greedy
,
implementation
,
math
,
number theory
1400
x13535
2153F
Odd Queries on Odd Array
bitmasks
,
brute force
,
data structures
,
implementation
,
trees
2900
x323
2153E
Zero Trailing Factorial
brute force
,
math
,
number theory
2400
x985
2153D
Not Alone
dp
,
greedy
1800
x6291
2153C
Symmetrical Polygons
constructive algorithms
,
geometry
,
greedy
,
implementation
,
sortings
1500
x11770
2152H2
Victorious Coloring (Hard Version)
data structures
,
greedy
,
schedules
3500
x199
2152H1
Victorious Coloring (Easy Version)
dfs and similar
,
dp
,
greedy
2900
x610
2152G
Query Jungle
data structures
,
implementation
,
math
,
matrices
,
trees
2900
x712
2152F
Triple Attack
data structures
,
greedy
2500
x1035
2152E
Monotone Subsequence
constructive algorithms
,
graphs
,
greedy
,
interactive
,
math
2100
x2778
2152D
Division Versus Addition
games
,
greedy
,
math
1700
x6745
2152C
Triple Removal
data structures
,
greedy
,
math
1400
x12211
2151C
Incremental Stay
greedy
,
implementation
,
math
1400
x10261
2150G
Counting Is Fun: The Finale
combinatorics
,
implementation
3500
x82
2150F
Cycle Closing
constructive algorithms
,
graphs
,
implementation
,
shortest paths
,
trees
3000
x203
2150E2
Hidden Single (Version 2)
binary search
,
divide and conquer
,
interactive
,
math
,
probabilities
2800
x598
2150E1
Hidden Single (Version 1)
divide and conquer
,
interactive
,
math
,
probabilities
,
sortings
2600
x1026
2150D
Attraction Theory
combinatorics
,
dp
,
math
2700
x752
2150C
Limited Edition Shop
data structures
,
dp
2100
x2653
2150B
Grid Counting
combinatorics
,
implementation
,
math
1700
x6048
2149G
Buratsuta 3
binary search
,
brute force
,
data structures
,
divide and conquer
,
probabilities
2100
x2666
2149F
Nezuko in the Clearing
binary search
,
math
,
ternary search
1900
x4812
2149E
Hidden Knowledge of the Ancients
data structures
,
two pointers
1500
x9270
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