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Please read
the new rule regarding the restriction on the use of AI tools
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Before contest
Codeforces Round (Div. 2)
7 days
→ Filter Problems
Difficulty:
—
combine-tags-by-or
*combine tags by OR
2-sat
binary search
bitmasks
brute force
chinese remainder theorem
combinatorics
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
Add tag
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Problems
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Status
Standings
Custom test
Problems
#
Name
1690E
Price Maximization
binary search
,
greedy
,
math
,
two pointers
1500
x15191
1690D
Black and White Stripe
implementation
,
two pointers
1000
x29607
1690C
Restoring the Duration of Tasks
data structures
,
greedy
,
implementation
800
x26115
1690B
Array Decrements
greedy
,
implementation
800
x25306
1690A
Print a Pedestal (Codeforces logo?)
constructive algorithms
,
greedy
800
x33474
1689E
ANDfinity
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2500
x1210
1689D
Lena and Matrix
data structures
,
dp
,
geometry
,
shortest paths
1900
x4215
1689C
Infected Tree
dfs and similar
,
dp
,
trees
1600
x11226
1689B
Mystic Permutation
data structures
,
greedy
900
x17537
1689A
Lex String
brute force
,
greedy
,
implementation
,
sortings
,
two pointers
800
x16781
1688C
Manipulating History
constructive algorithms
,
greedy
,
strings
1700
x8149
1688B
Patchouli's Magical Talisman
bitmasks
,
constructive algorithms
,
greedy
,
sortings
800
x18270
1688A
Cirno's Perfect Bitmasks Classroom
bitmasks
,
brute force
800
x21626
1687F
Koishi's Unconscious Permutation
fft
,
math
3500
x84
1687E
Become Big For Me
combinatorics
,
constructive algorithms
,
greedy
,
math
,
number theory
3500
x226
1687D
Cute number
binary search
,
brute force
,
data structures
,
dsu
,
implementation
,
math
2900
x591
1687C
Sanae and Giant Robot
binary search
,
brute force
,
data structures
,
dsu
,
greedy
,
sortings
2500
x1413
1687B
Railway System
constructive algorithms
,
graphs
,
greedy
,
interactive
,
sortings
1700
x3644
1687A
The Enchanted Forest
brute force
,
greedy
1600
x10383
1686B
Odd Subarrays
dp
,
greedy
800
x18258
1686A
Everything Everywhere All But One
greedy
800
x20486
1685E
The Ultimate LIS Problem
data structures
,
greedy
3500
x150
1685D2
Permutation Weight (Hard Version)
constructive algorithms
,
greedy
3500
x107
1685D1
Permutation Weight (Easy Version)
constructive algorithms
,
dfs and similar
,
dsu
2800
x444
1685C
Bring Balance
brute force
,
constructive algorithms
,
greedy
2600
x1012
1685B
Linguistics
greedy
,
implementation
,
sortings
,
strings
2000
x3272
1685A
Circular Local MiniMax
constructive algorithms
,
greedy
,
sortings
1100
x17107
1684H
Hard Cut
constructive algorithms
,
dfs and similar
,
divide and conquer
,
math
3400
x239
1684G
Euclid Guess
constructive algorithms
,
flows
,
graph matchings
,
math
,
number theory
2800
x610
1684F
Diverse Segments
data structures
,
two pointers
2600
x902
1684E
MEX vs DIFF
binary search
,
brute force
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
2100
x3162
1684D
Traps
constructive algorithms
,
greedy
,
sortings
1700
x9664
1684C
Column Swapping
brute force
,
constructive algorithms
,
greedy
,
implementation
,
sortings
1400
x12316
1684B
Z mod X = C
constructive algorithms
,
math
800
x20954
1684A
Digit Minimization
constructive algorithms
,
games
,
math
,
strings
800
x23876
1682F
MCMF?
data structures
,
flows
,
graphs
,
greedy
,
sortings
,
two pointers
2700
x314
1682E
Unordered Swaps
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
math
,
sortings
,
trees
2700
x599
1682D
Circular Spanning Tree
constructive algorithms
,
implementation
,
trees
2000
x3305
1682C
LIS or Reverse LIS?
constructive algorithms
,
greedy
,
implementation
,
math
1400
x14740
1682B
AND Sorting
bitmasks
,
constructive algorithms
,
sortings
1100
x18573
1682A
Palindromic Indices
greedy
,
strings
800
x19279
1681F
Unique Occurrences
data structures
,
dfs and similar
,
divide and conquer
,
dp
,
dsu
,
trees
2300
x1761
1681E
Labyrinth Adventures
data structures
,
dp
,
matrices
,
shortest paths
2600
x796
1681D
Required Length
brute force
,
dfs and similar
,
dp
,
hashing
,
shortest paths
1700
x9627
1681C
Double Sort
implementation
,
sortings
1200
x17374
1681B
Card Trick
implementation
,
math
800
x20100
1681A
Game with Cards
games
,
greedy
800
x20969
1680F
Lenient Vertex Cover
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
trees
2600
x666
1680E
Moving Chips
bitmasks
,
dp
,
greedy
2000
x3791
1680D
Dog Walking
brute force
,
greedy
,
math
2400
x1167
1680C
Binary String
binary search
,
greedy
,
strings
,
two pointers
1600
x9927
1680B
Robots
implementation
800
x18309
1680A
Minimums and Maximums
brute force
,
math
800
x21570
1679F
Formalism for Formalism
bitmasks
,
dp
,
math
2600
x541
1679E
Typical Party in Dorm
bitmasks
,
combinatorics
,
dp
,
strings
2400
x1180
1679D
Toss a Coin to Your Graph...
binary search
,
dfs and similar
,
dp
,
graphs
1900
x4842
1679C
Rooks Defenders
data structures
,
implementation
1400
x10312
1679B
Stone Age Problem
data structures
,
implementation
1200
x18486
1679A
AvtoBus
brute force
,
greedy
,
math
,
number theory
900
x24168
1678B2
Tokitsukaze and Good 01-String (hard version)
dp
,
greedy
,
implementation
1800
x6609
1678B1
Tokitsukaze and Good 01-String (easy version)
implementation
800
x15926
1678A
Tokitsukaze and All Zero Sequence
implementation
800
x18145
1677F
Tokitsukaze and Gems
dp
,
math
3500
x93
1677E
Tokitsukaze and Beautiful Subsegments
data structures
2900
x551
1677D
Tokitsukaze and Permutations
dp
,
math
2500
x1257
1677C
Tokitsukaze and Two Colorful Tapes
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
1900
x3592
1677B
Tokitsukaze and Meeting
data structures
,
implementation
,
math
1700
x4177
1677A
Tokitsukaze and Strange Inequality
brute force
,
data structures
,
dp
1600
x8432
1676H2
Maximum Crossings (Hard Version)
data structures
,
divide and conquer
,
sortings
1500
x10750
1676H1
Maximum Crossings (Easy Version)
brute force
1400
x14042
1676G
White-Black Balanced Subtrees
dfs and similar
,
dp
,
graphs
,
trees
1300
x15692
1676F
Longest Strike
data structures
,
greedy
,
implementation
,
sortings
,
two pointers
1300
x16719
1676E
Eating Queries
binary search
,
greedy
,
sortings
1100
x26348
1676D
X-Sum
brute force
,
greedy
,
implementation
1000
x25161
1676C
Most Similar Words
brute force
,
greedy
,
implementation
,
implementation
,
math
,
strings
800
x30134
1676B
Equal Candies
greedy
,
math
,
sortings
800
x48383
1676A
Lucky?
implementation
800
x63823
1675G
Sorting Pancakes
dp
2300
x1773
1675F
Vlad and Unfinished Business
dfs and similar
,
dp
,
greedy
,
trees
1800
x5328
1675E
Replace With the Previous, Minimize
dsu
,
greedy
,
strings
1500
x10630
1675D
Vertical Paths
graphs
,
implementation
,
trees
1300
x13076
1675C
Detective Task
implementation
1100
x18219
1675B
Make It Increasing
greedy
,
implementation
900
x27069
1675A
Food for Animals
greedy
,
math
800
x32969
1674G
Remove Directed Edges
dfs and similar
,
dp
,
graphs
2000
x2498
1674F
Desktop Rearrangement
data structures
,
greedy
,
implementation
1800
x5053
1674E
Breaking the Wall
binary search
,
brute force
,
constructive algorithms
,
greedy
,
math
2000
x6420
1674D
A-B-C Sort
constructive algorithms
,
implementation
,
sortings
1200
x16343
1674C
Infinite Replacement
combinatorics
,
implementation
,
strings
1000
x23610
1674B
Dictionary
combinatorics
,
math
800
x26299
1674A
Number Transformation
constructive algorithms
,
math
800
x26265
1673F
Anti-Theft Road Planning
bitmasks
,
constructive algorithms
,
divide and conquer
,
greedy
,
interactive
,
math
2400
x822
1673E
Power or XOR?
bitmasks
,
combinatorics
,
math
,
number theory
2500
x709
1673D
Lost Arithmetic Progression
combinatorics
,
math
,
number theory
1900
x3310
1673C
Palindrome Basis
brute force
,
dp
,
math
,
number theory
1500
x12745
1673B
A Perfectly Balanced String?
brute force
,
greedy
,
strings
1100
x15210
1673A
Subtle Substring Subtraction
games
,
greedy
,
strings
800
x18438
1672I
PermutationForces
data structures
,
greedy
3000
x172
1672H
Zigu Zagu
constructive algorithms
,
data structures
,
greedy
2700
x948
1672G
Cross Xor
constructive algorithms
,
graphs
,
math
,
matrices
3200
x323
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