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Custom test
Problems
#
Name
2171C2
Renako Amaori and XOR Game (hard version)
bitmasks
,
games
,
greedy
1400
x12039
2171C1
Renako Amaori and XOR Game (easy version)
bitmasks
,
games
,
greedy
1100
x19479
2171B
Yuu Koito and Minimum Absolute Sum
math
900
x27422
2171A
Shizuku Hoshikawa and Farm Legs
brute force
,
math
800
x37552
2170F
Build XOR on a Segment
bitmasks
,
dp
2600
x799
2170E
Binary Strings and Blocks
combinatorics
,
data structures
,
dp
2100
x2361
2170D
Almost Roman
constructive algorithms
,
greedy
,
implementation
2200
x1707
2170C
Quotient and Remainder
binary search
,
greedy
,
two pointers
1300
x11445
2170B
Addition on a Segment
greedy
,
math
1200
x14565
2170A
Maximum Neighborhood
bitmasks
,
brute force
,
greedy
,
implementation
,
math
800
x20179
2169F
Subsequence Problem
combinatorics
,
dp
,
fft
,
math
2700
x343
2169E
Points Selection
dp
,
greedy
2400
x1093
2169D2
Removal of a Sequence (Hard Version)
binary search
,
divide and conquer
,
greedy
,
implementation
,
math
,
number theory
2100
x2309
2169D1
Removal of a Sequence (Easy Version)
binary search
,
implementation
,
math
,
number theory
1500
x8688
2169C
Range Operation
dp
,
greedy
,
math
,
two pointers
1300
x12888
2169B
Drifting Away
greedy
,
implementation
1100
x16325
2169A
Alice and Bob
greedy
,
implementation
900
x19372
2168C
Intercepting Butterflies
bitmasks
,
communication
,
constructive algorithms
,
graphs
,
interactive
x881
2168B
Locate
binary search
,
combinatorics
,
communication
,
constructive algorithms
,
greedy
,
interactive
x1585
2168A2
Encode and Decode (Hard Version)
bitmasks
,
communication
,
interactive
,
math
x3397
2168A1
Encode and Decode (Easy Version)
communication
,
constructive algorithms
,
interactive
x5087
2167G
Mukhammadali and the Smooth Array
data structures
,
dp
1600
x11175
2167F
Tree, TREE!!!
dfs and similar
,
dp
,
math
,
trees
1600
x7249
2167E
khba Loves to Sleep!
binary search
,
data structures
,
geometry
,
greedy
,
implementation
1600
x9211
2167D
Yet Another Array Problem
brute force
,
implementation
,
math
,
number theory
1000
x30610
2167C
Isamatdin and His Magic Wand!
constructive algorithms
,
greedy
,
implementation
,
sortings
800
x36378
2167B
Your Name
sortings
,
strings
800
x52578
2167A
Square?
math
,
sortings
800
x59424
2166B
Tab Closing
math
900
x18366
2166A
Same Difference
brute force
,
greedy
,
strings
800
x23114
2165F
Arctic Acquisition
data structures
,
greedy
3500
x197
2165E
Rainbow Branch
constructive algorithms
,
dp
,
greedy
,
trees
3200
x307
2165D
Path Split
graph matchings
,
greedy
2500
x908
2165C
Binary Wine
bitmasks
,
greedy
,
math
2000
x3859
2165B
Marble Council
dp
,
math
,
sortings
1900
x4836
2165A
Cyclic Merging
constructive algorithms
,
greedy
1300
x14531
2164H
PalindromePalindrome
data structures
,
strings
3400
x46
2164G
Pointless Machine
constructive algorithms
,
graphs
,
interactive
,
trees
3300
x228
2164F2
Chain Prefix Rank (Hard Version)
binary search
,
combinatorics
,
data structures
,
dfs and similar
,
dp
,
graphs
,
math
,
trees
2900
x491
2164F1
Chain Prefix Rank (Easy Version)
combinatorics
,
dfs and similar
,
dp
,
math
,
trees
2600
x747
2164E
Journey
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
2300
x1902
2164D
Copy String
greedy
,
implementation
,
strings
,
two pointers
1800
x5269
2164C
Dungeon
binary search
,
brute force
,
data structures
,
greedy
,
sortings
1400
x11108
2164B
Even Modulo Pair
brute force
,
math
,
number theory
1000
x18722
2164A
Sequence Game
brute force
,
sortings
800
x21239
2163E
Plegma
bitmasks
,
combinatorics
,
communication
,
interactive
2700
x645
2163D2
Diadrash (Hard Version)
binary search
,
interactive
,
math
,
sortings
2500
x1518
2163D1
Diadrash (Easy Version)
binary search
,
brute force
,
divide and conquer
,
implementation
,
interactive
2100
x2754
2163C
Monopati
brute force
,
combinatorics
,
dp
,
math
,
two pointers
1500
x9189
2163B
Siga ta Kymata
constructive algorithms
,
greedy
,
implementation
,
math
1700
x9253
2163A
Souvlaki VS. Kalamaki
brute force
,
greedy
,
math
,
sortings
800
x19736
2162H
Beautiful Problem
dp
2900
x319
2162G
Beautiful Tree
constructive algorithms
,
math
,
probabilities
,
trees
2200
x2832
2162F
Beautiful Intervals
constructive algorithms
,
greedy
2100
x2950
2162E
Beautiful Palindromes
constructive algorithms
,
greedy
,
schedules
1600
x9476
2162D
Beautiful Permutation
binary search
,
interactive
1400
x12497
2162C
Beautiful XOR
bitmasks
,
constructive algorithms
,
greedy
1100
x21578
2162B
Beautiful String
brute force
,
constructive algorithms
1000
x28173
2162A
Beautiful Average
brute force
,
greedy
800
x41941
2161H
Cycle Sort
data structures
3500
x67
2161G
Bitwise And Equals
bitmasks
,
greedy
3500
x92
2161F
SubMST
combinatorics
,
graphs
,
trees
3000
x353
2161E
Left is Always Right
combinatorics
,
implementation
,
math
2400
x790
2161D
Locked Out
binary search
,
data structures
,
dp
,
greedy
2100
x2801
2161C
Loyalty
constructive algorithms
,
greedy
,
sortings
,
two pointers
1200
x12791
2161B
Make Connected
brute force
,
implementation
1700
x5432
2161A
Round Trip
games
,
greedy
,
implementation
,
math
800
x15813
2160C
Reverse XOR
bitmasks
1300
x15335
2160B
Distinct Elements
greedy
,
math
1100
x17942
2160A
MEX Partition
math
800
x22602
2159F
Grand Finale: Snakes
binary search
,
interactive
,
ternary search
3500
x416
2159E
Super-Short-Polynomial-San
math
,
meet-in-the-middle
3500
x363
2159D2
Inverse Minimum Partition (Hard Version)
dp
,
greedy
,
math
3200
x399
2159D1
Inverse Minimum Partition (Easy Version)
binary search
,
brute force
,
dp
,
geometry
,
greedy
,
math
,
two pointers
2500
x1111
2159C
Twin Polynomials
combinatorics
,
graph matchings
,
math
2300
x1904
2159B
Rectangles
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
implementation
,
two pointers
2100
x2561
2159A
MAD Interactive Problem
constructive algorithms
,
implementation
,
interactive
1700
x8379
2158F2
Distinct GCDs (Hard Version)
combinatorics
,
constructive algorithms
,
graphs
,
math
,
number theory
,
number theory
3000
x261
2158F1
Distinct GCDs (Easy Version)
constructive algorithms
,
graphs
,
math
,
number theory
2600
x419
2158E
Sink
data structures
,
divide and conquer
,
dsu
,
graphs
,
implementation
2600
x641
2158D
Palindrome Flipping
brute force
,
constructive algorithms
,
graphs
,
implementation
,
shortest paths
,
strings
2000
x3340
2158C
Annoying Game
dp
,
games
,
greedy
1400
x11315
2158B
Split
constructive algorithms
,
greedy
,
math
1200
x14202
2158A
Suspension
constructive algorithms
,
greedy
,
math
800
x23643
2157I
Hyper Smawk Bros
dp
,
dp
,
games
3500
x173
2157H
Keygen 3
brute force
,
combinatorics
,
constructive algorithms
,
dfs and similar
,
math
3200
x133
2157G
Isaac's Queries
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
divide and conquer
,
dp
,
greedy
,
interactive
,
math
,
probabilities
2800
x460
2157F
Git Gud
brute force
,
constructive algorithms
,
divide and conquer
,
math
,
ternary search
2400
x1370
2157E
Adjusting Drones
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
implementation
,
sortings
1900
x3778
2157D
Billion Players Game
binary search
,
greedy
,
math
,
sortings
,
ternary search
,
two pointers
1600
x6361
2157C
Meximum Array 2
constructive algorithms
,
greedy
,
implementation
,
math
1400
x9711
2157B
Expansion Plan 2
implementation
,
math
900
x13354
2157A
Dungeon Equilibrium
greedy
,
implementation
,
sortings
800
x16960
2156F2
Strange Operation (Hard Version)
data structures
,
greedy
,
trees
3000
x249
2156F1
Strange Operation (Easy Version)
brute force
,
data structures
,
greedy
,
implementation
,
sortings
2200
x1630
2156E
Best Time to Buy and Sell Stock
binary search
,
brute force
,
data structures
,
dp
,
games
,
graphs
,
greedy
2500
x972
2156D
Find the Last Number
binary search
,
bitmasks
,
constructive algorithms
,
interactive
1900
x5425
2156C
Maximum GCD on Whiteboard
greedy
,
math
,
number theory
1400
x12449
2156B
Strange Machine
binary search
,
brute force
,
greedy
,
implementation
1000
x21003
2156A
Pizza Time
brute force
,
constructive algorithms
,
greedy
800
x27070
←
1
2
3
4
5
6
7
...
112
113
→
→ Pay attention
Before contest
Codeforces Round (Div. 2)
8 days
→ Filter Problems
Difficulty:
—
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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