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Codeforces Round 1097 (Div. 1, Based on Zhili Cup 2026)
3 days
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Before contest
Codeforces Round 1097 (Div. 2, Based on Zhili Cup 2026)
3 days
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→ Filter Problems
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two pointers
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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Name
2227D
Palindromex
binary search
,
brute force
,
constructive algorithms
,
data structures
,
greedy
,
implementation
,
two pointers
x7989
2226E
Mental Monumental (Hard Version)
data structures
,
greedy
,
math
,
two pointers
x698
2226C
Mental Monumental (Easy Version)
binary search
,
data structures
,
greedy
,
math
,
two pointers
x5400
2211C1
Equal Multisets (Easy Version)
binary search
,
brute force
,
greedy
,
two pointers
1300
x9026
2207H3
Bowser's Castle (Hard Version)
constructive algorithms
,
divide and conquer
,
interactive
,
trees
,
two pointers
x56
2207H2
Bowser's Castle (Medium Version)
constructive algorithms
,
divide and conquer
,
interactive
,
trees
,
two pointers
x39
2204F
Sum of Fractions
binary search
,
brute force
,
combinatorics
,
data structures
,
greedy
,
math
,
number theory
,
two pointers
2200
x1219
2203F
Binary Search with One Swap
binary search
,
divide and conquer
,
dp
,
hashing
,
math
,
two pointers
2600
x413
2197B
Array and Permutation
implementation
,
schedules
,
sortings
,
two pointers
1100
x15852
2196B
Another Problem about Beautiful Pairs
brute force
,
math
,
two pointers
1600
x8555
2193D
Monster Game
binary search
,
sortings
,
two pointers
1100
x21534
2190C
Comparable Permutations
greedy
,
implementation
,
interactive
,
sortings
,
two pointers
2300
x1289
2190B1
Sub-RBS (Easy Version)
combinatorics
,
constructive algorithms
,
dp
,
greedy
,
strings
,
two pointers
1400
x10651
2185E
The Robotic Rush
binary search
,
greedy
,
implementation
,
two pointers
1500
x10194
2185D
OutOfMemoryError
data structures
,
implementation
,
math
,
two pointers
1100
x20642
2183C
War Strategy
binary search
,
greedy
,
math
,
two pointers
1500
x10653
2182E
New Year's Gifts
binary search
,
data structures
,
greedy
,
sortings
,
two pointers
1800
x5562
2174A
Needle in a Haystack
greedy
,
strings
,
two pointers
1200
x14273
2170C
Quotient and Remainder
binary search
,
greedy
,
two pointers
1300
x11227
2169C
Range Operation
dp
,
greedy
,
math
,
two pointers
1300
x12648
2164D
Copy String
greedy
,
implementation
,
strings
,
two pointers
1800
x4958
2163C
Monopati
brute force
,
combinatorics
,
dp
,
math
,
two pointers
1500
x9011
2161C
Loyalty
constructive algorithms
,
greedy
,
sortings
,
two pointers
1200
x12525
2159D1
Inverse Minimum Partition (Easy Version)
binary search
,
brute force
,
dp
,
geometry
,
greedy
,
math
,
two pointers
2500
x1017
2159B
Rectangles
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
implementation
,
two pointers
2100
x2308
2157D
Billion Players Game
binary search
,
greedy
,
math
,
sortings
,
ternary search
,
two pointers
1600
x5994
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
x4755
2154A
Notelock
greedy
,
two pointers
800
x23149
2149E
Hidden Knowledge of the Ancients
data structures
,
two pointers
1500
x9254
2148E
Split
binary search
,
data structures
,
two pointers
1200
x14031
2143D2
Inversion Graph Coloring (Hard Version)
binary search
,
combinatorics
,
data structures
,
dp
,
two pointers
2200
x2767
2143D1
Inversion Graph Coloring (Easy Version)
combinatorics
,
data structures
,
dp
,
greedy
,
two pointers
1800
x6390
2143B
Discounts
greedy
,
sortings
,
two pointers
1000
x20899
2143A
All Lengths Subtraction
brute force
,
two pointers
800
x20691
2138B
Antiamuny Wants to Learn Swap
data structures
,
greedy
,
two pointers
1900
x5322
2136B
Like the Bitset
constructive algorithms
,
greedy
,
two pointers
900
x20915
2131F
Unjust Binary Life
binary search
,
data structures
,
greedy
,
greedy
,
math
,
sortings
,
two pointers
1900
x4715
2128E2
Submedians (Hard Version)
binary search
,
constructive algorithms
,
data structures
,
math
,
two pointers
2600
x795
2128B
Deque Process
constructive algorithms
,
greedy
,
sortings
,
two pointers
1100
x21406
2126G2
Big Wins! (hard version)
binary search
,
data structures
,
divide and conquer
,
dsu
,
trees
,
two pointers
2400
x1160
2126G1
Big Wins! (easy version)
binary search
,
data structures
,
dp
,
dsu
,
two pointers
2200
x2479
2125E
Sets of Complementary Sums
brute force
,
combinatorics
,
dp
,
math
,
two pointers
2500
x1416
2124D
Make a Palindrome
greedy
,
sortings
,
two pointers
1700
x8086
2123E
MEX Count
binary search
,
data structures
,
greedy
,
sortings
,
two pointers
1400
x14892
2121F
Yamakasi
binary search
,
brute force
,
data structures
,
greedy
,
two pointers
1800
x8115
2112C
Coloring Game
binary search
,
brute force
,
greedy
,
two pointers
1300
x17708
2111C
Equal Values
brute force
,
greedy
,
two pointers
1100
x19424
2106D
Flower Boy
binary search
,
dp
,
greedy
,
two pointers
1500
x12258
2103E
Keep the Sum
constructive algorithms
,
implementation
,
two pointers
2600
x600
2103D
Local Construction
constructive algorithms
,
dfs and similar
,
implementation
,
two pointers
2000
x3980
2101D
Mani and Segments
data structures
,
implementation
,
sortings
,
two pointers
2500
x1018
2101C
23 Kingdom
binary search
,
brute force
,
data structures
,
greedy
,
ternary search
,
two pointers
2200
x2260
2096F
Wonderful Impostors
data structures
,
implementation
,
two pointers
3100
x458
2094D
Tung Tung Sahur
greedy
,
strings
,
two pointers
1100
x23851
2093G
Shorten the Array
binary search
,
bitmasks
,
data structures
,
dfs and similar
,
greedy
,
strings
,
trees
,
two pointers
1900
x3799
2091E
Interesting Ratio
brute force
,
math
,
number theory
,
two pointers
1300
x19625
2089B2
Canteen (Hard Version)
binary search
,
data structures
,
dp
,
flows
,
greedy
,
two pointers
2300
x1280
2089B1
Canteen (Easy Version)
binary search
,
data structures
,
flows
,
greedy
,
two pointers
1900
x3231
2084E
Blossom
binary search
,
combinatorics
,
dp
,
implementation
,
math
,
two pointers
2400
x1790
2074D
Counting Points
brute force
,
data structures
,
geometry
,
implementation
,
two pointers
1400
x12054
2069D
Palindrome Shuffle
binary search
,
greedy
,
hashing
,
strings
,
two pointers
1800
x7045
2069C
Beautiful Sequence
combinatorics
,
dp
,
greedy
,
two pointers
1500
x14808
2068C
Ads
binary search
,
greedy
,
two pointers
2100
x1637
2064F
We Be Summing
binary search
,
data structures
,
dp
,
two pointers
2600
x701
2064D
Eating
binary search
,
bitmasks
,
brute force
,
data structures
,
dp
,
greedy
,
trees
,
two pointers
1900
x5872
2064B
Variety is Discouraged
binary search
,
constructive algorithms
,
greedy
,
two pointers
1100
x20108
2063D
Game With Triangles
binary search
,
brute force
,
data structures
,
geometry
,
greedy
,
implementation
,
math
,
ternary search
,
two pointers
2000
x5040
2060C
Game of Mathletes
games
,
greedy
,
sortings
,
two pointers
900
x32060
2057F
Formation
binary search
,
data structures
,
dp
,
sortings
,
two pointers
3300
x246
2055C
The Trail
brute force
,
constructive algorithms
,
greedy
,
math
,
two pointers
1400
x17236
2053I2
Affectionate Arrays (Hard Version)
data structures
,
dp
,
graphs
,
greedy
,
math
,
shortest paths
,
two pointers
3500
x107
2051D
Counting Pairs
binary search
,
sortings
,
two pointers
1200
x23897
2048D
Kevin and Competition Memories
binary search
,
brute force
,
data structures
,
greedy
,
sortings
,
two pointers
1600
x8305
2046C
Adventurers
binary search
,
data structures
,
greedy
,
sortings
,
ternary search
,
two pointers
2100
x2346
2042D
Recommendations
data structures
,
implementation
,
sortings
,
two pointers
1900
x5231
2041M
Selection Sort
binary search
,
data structures
,
greedy
,
two pointers
2000
x1323
2040D
Non Prime Tree
brute force
,
constructive algorithms
,
dfs and similar
,
greedy
,
number theory
,
trees
,
two pointers
1900
x5847
2040C
Ordered Permutations
bitmasks
,
combinatorics
,
constructive algorithms
,
greedy
,
math
,
two pointers
1600
x10775
2038L
Bridge Renovation
brute force
,
dp
,
greedy
,
math
,
two pointers
1400
x7979
2037F
Ardent Flames
binary search
,
data structures
,
math
,
sortings
,
two pointers
2100
x2968
2037E
Kachina's Favorite Binary String
dp
,
greedy
,
interactive
,
two pointers
1600
x7370
2037D
Sharky Surfing
data structures
,
greedy
,
two pointers
1300
x14740
2036F
XORificator 3000
bitmasks
,
dp
,
number theory
,
two pointers
1900
x5254
2034B
Rakhsh's Revival
data structures
,
greedy
,
implementation
,
two pointers
1000
x15757
2033C
Sakurako's Field Trip
dp
,
greedy
,
two pointers
1400
x17808
2032D
Genokraken
constructive algorithms
,
data structures
,
graphs
,
greedy
,
implementation
,
interactive
,
trees
,
two pointers
1800
x6199
2032C
Trinity
binary search
,
math
,
sortings
,
two pointers
1400
x16160
2031D
Penchick and Desert Rabbit
binary search
,
data structures
,
dfs and similar
,
dp
,
dsu
,
greedy
,
implementation
,
two pointers
1700
x9671
2030F
Orangutan Approved Subarrays
binary search
,
data structures
,
dp
,
greedy
,
implementation
,
two pointers
2400
x1177
2028C
Alice's Adventures in Cutting Cake
binary search
,
dp
,
greedy
,
two pointers
1600
x9971
2027D2
The Endspeaker (Hard Version)
binary search
,
data structures
,
dp
,
greedy
,
implementation
,
two pointers
2200
x1903
2027D1
The Endspeaker (Easy Version)
binary search
,
dp
,
graphs
,
greedy
,
implementation
,
two pointers
1700
x6961
2025D
Attribute Checks
brute force
,
data structures
,
dp
,
implementation
,
math
,
two pointers
1800
x7876
2025C
New Game
binary search
,
brute force
,
greedy
,
implementation
,
sortings
,
two pointers
1300
x19027
2025A
Two Screens
binary search
,
greedy
,
strings
,
two pointers
800
x28560
2018B
Speedbreaker
binary search
,
data structures
,
dp
,
greedy
,
implementation
,
two pointers
1900
x5184
2010C2
Message Transmission Error (hard version)
hashing
,
string suffix structures
,
strings
,
two pointers
1700
x4578
2009G1
Yunli's Subarray Queries (easy version)
binary search
,
data structures
,
two pointers
1900
x5363
2006C
Eri and Expanded Sets
data structures
,
divide and conquer
,
math
,
number theory
,
two pointers
2300
x2072
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