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Rayan
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Before contest
Codeforces Round (Div. 3)
6 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
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Problems
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Custom test
Problems
#
Name
2069F
Graph Inclusion
data structures
,
divide and conquer
,
dsu
x221
2069E
A, B, AB and BA
constructive algorithms
,
greedy
,
sortings
,
strings
x723
2069D
Palindrome Shuffle
binary search
,
greedy
,
hashing
,
implementation
,
strings
,
two pointers
x3097
2069C
Beautiful Sequence
combinatorics
,
dp
,
greedy
x7063
2069B
Set of Strangers
greedy
,
matrices
x11013
2069A
Was there an Array?
brute force
,
greedy
x18151
2067C
Devyatkino
brute force
,
dfs and similar
,
greedy
,
math
x8821
2067B
Two Large Bags
brute force
,
dp
,
greedy
,
sortings
x12728
2067A
Adjacent Digit Sums
brute force
,
constructive algorithms
,
math
x19674
2066F
Curse
constructive algorithms
,
dp
,
math
x27
2066E
Tropical Season
binary search
,
data structures
,
greedy
,
implementation
x155
2066D2
Club of Young Aircraft Builders (hard version)
combinatorics
,
dp
,
math
x283
2066D1
Club of Young Aircraft Builders (easy version)
combinatorics
,
dp
,
math
x775
2066C
Bitwise Slides
bitmasks
,
combinatorics
,
dp
,
math
x1422
2066B
White Magic
constructive algorithms
,
data structures
,
dp
,
greedy
,
implementation
x2993
2066A
Object Identification
graphs
,
greedy
,
implementation
,
interactive
x4482
2065H
Bro Thinks He's Him
combinatorics
,
data structures
,
divide and conquer
,
dp
,
math
,
matrices
x1215
2065G
Skibidus and Capping
combinatorics
,
math
,
number theory
x3434
2065F
Skibidus and Slay
data structures
,
dfs and similar
,
graphs
,
greedy
,
trees
x4186
2065E
Skibidus and Rizz
constructive algorithms
,
greedy
,
strings
x7487
2065D
Skibidus and Sigma
greedy
,
sortings
x14268
2065C2
Skibidus and Fanum Tax (hard version)
binary search
,
greedy
x12766
2065C1
Skibidus and Fanum Tax (easy version)
binary search
,
dp
,
greedy
x19989
2065B
Skibidus and Ohio
strings
x29771
2065A
Skibidus and Amog'u
brute force
,
constructive algorithms
,
greedy
,
implementation
,
strings
x38809
2064F
We Be Summing
binary search
,
data structures
,
two pointers
x280
2064E
Mycraft Sand Sort
combinatorics
,
data structures
,
dsu
,
greedy
,
math
x691
2064D
Eating
binary search
,
bitmasks
,
brute force
,
data structures
,
dp
,
greedy
,
two pointers
x3298
2064C
Remove the Ends
brute force
,
constructive algorithms
,
dp
,
greedy
x11141
2064B
Variety is Discouraged
binary search
,
constructive algorithms
,
greedy
,
two pointers
x14130
2064A
Brogramming Contest
greedy
,
strings
x20808
2063F2
Counting Is Not Fun (Hard Version)
combinatorics
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
implementation
,
trees
2700
x570
2063F1
Counting Is Not Fun (Easy Version)
combinatorics
,
data structures
,
dfs and similar
,
dp
,
dsu
,
graphs
,
hashing
,
implementation
,
math
,
trees
2400
x995
2063E
Triangle Tree
data structures
,
dfs and similar
,
dp
,
greedy
,
trees
2300
x1660
2063D
Game With Triangles
binary search
,
brute force
,
data structures
,
geometry
,
greedy
,
implementation
,
math
,
ternary search
,
two pointers
2000
x3541
2063C
Remove Exactly Two
brute force
,
data structures
,
dfs and similar
,
dp
,
graphs
,
greedy
,
sortings
,
trees
1600
x10359
2063B
Subsequence Update
constructive algorithms
,
data structures
,
greedy
,
sortings
1100
x18903
2063A
Minimal Coprime
math
,
number theory
800
x26307
2062H
Galaxy Generator
bitmasks
,
combinatorics
,
dp
3500
x77
2062G
Permutation Factory
flows
,
geometry
,
graph matchings
,
graphs
3500
x80
2062F
Traveling Salescat
constructive algorithms
,
dp
,
geometry
,
graphs
,
greedy
,
math
,
sortings
2900
x393
2062E2
The Game (Hard Version)
data structures
,
dfs and similar
,
games
,
graphs
,
implementation
,
trees
3000
x294
2062E1
The Game (Easy Version)
data structures
,
dfs and similar
,
games
,
graphs
,
greedy
,
trees
2000
x3281
2062D
Balanced Tree
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
2200
x2650
2062C
Cirno and Operations
brute force
,
math
1200
x14343
2062B
Clockwork
greedy
,
math
900
x18544
2062A
String
constructive algorithms
,
greedy
,
math
,
strings
800
x23283
2061I
Kevin and Nivek
divide and conquer
,
dp
3500
x48
2061H2
Kevin and Stones (Hard Version)
flows
,
graphs
3500
x24
2061H1
Kevin and Stones (Easy Version)
flows
,
graph matchings
,
graphs
3500
x54
2061G
Kevin and Teams
constructive algorithms
,
graphs
,
interactive
2900
x353
2061F2
Kevin and Binary String (Hard Version)
data structures
,
dp
3500
x96
2061F1
Kevin and Binary String (Easy Version)
greedy
,
implementation
2100
x1693
2061E
Kevin and And
bitmasks
,
brute force
,
dp
,
greedy
,
math
,
sortings
2000
x2868
2061D
Kevin and Numbers
bitmasks
,
data structures
1600
x7819
2061C
Kevin and Puzzle
2-sat
,
combinatorics
,
dp
1600
x7049
2061B
Kevin and Geometry
binary search
,
geometry
1100
x11917
2061A
Kevin and Arithmetic
math
800
x18721
2060G
Bugged Sort
dp
,
greedy
,
sortings
2400
x773
2060F
Multiplicative Arrays
combinatorics
,
dp
,
number theory
2200
x1655
2060E
Graph Composition
dfs and similar
,
dsu
,
graphs
,
greedy
1500
x8128
2060D
Subtract Min Sort
greedy
1100
x20884
2060C
Game of Mathletes
games
,
greedy
,
sortings
,
two pointers
900
x24146
2060B
Farmer John's Card Game
greedy
,
sortings
1000
x22228
2060A
Fibonacciness
brute force
800
x33087
2059E2
Stop Gaming (Hard Version)
brute force
,
constructive algorithms
,
data structures
,
hashing
,
strings
x240
2059E1
Stop Gaming (Easy Version)
brute force
,
constructive algorithms
,
greedy
,
hashing
,
strings
x618
2059D
Graph and Graph
data structures
,
graphs
,
greedy
,
shortest paths
x4470
2059C
Customer Service
brute force
,
constructive algorithms
,
graph matchings
,
greedy
,
math
,
sortings
x9116
2059B
Cost of the Array
brute force
,
constructive algorithms
,
greedy
,
math
x14352
2059A
Milya and Two Arrays
constructive algorithms
,
greedy
,
sortings
x24524
2057H
Coffee Break
data structures
,
greedy
,
math
3500
x133
2057G
Secret Message
constructive algorithms
,
dfs and similar
,
math
3000
x512
2057F
Formation
binary search
,
data structures
,
dp
,
sortings
,
two pointers
3300
x190
2057E2
Another Exercise on Graphs (hard version)
binary search
,
dfs and similar
,
dp
,
dsu
,
graphs
,
shortest paths
,
sortings
2500
x1445
2057E1
Another Exercise on Graphs (Easy Version)
binary search
,
brute force
,
dp
,
dsu
,
graphs
,
shortest paths
,
sortings
2300
x2008
2057D
Gifts Order
data structures
,
greedy
,
implementation
,
math
,
matrices
2000
x4295
2057C
Trip to the Olympiad
bitmasks
,
constructive algorithms
,
greedy
,
math
1500
x11126
2057B
Gorilla and the Exam
greedy
,
sortings
1000
x19130
2057A
MEX Table
constructive algorithms
,
math
800
x24762
2056F2
Xor of Median (Hard Version)
bitmasks
,
brute force
,
combinatorics
,
dp
,
math
3000
x155
2056F1
Xor of Median (Easy Version)
bitmasks
,
brute force
,
combinatorics
,
dp
,
math
2700
x226
2056E
Nested Segments
combinatorics
,
dfs and similar
,
dp
,
dsu
,
math
2500
x704
2056D
Unique Median
binary search
,
brute force
,
combinatorics
,
data structures
,
divide and conquer
,
dp
2200
x2634
2056C
Palindromic Subsequences
brute force
,
constructive algorithms
,
math
1200
x15255
2056B
Find the Permutation
brute force
,
dfs and similar
,
graphs
,
implementation
,
sortings
1300
x14480
2056A
Shape Perimeter
constructive algorithms
,
math
800
x23742
2055F
Cosmic Divide
brute force
,
geometry
,
hashing
,
math
,
strings
3200
x57
2055E
Haystacks
brute force
,
constructive algorithms
,
data structures
,
greedy
,
sortings
2800
x323
2055D
Scarecrow
greedy
,
implementation
,
math
2000
x3545
2055C
The Trail
brute force
,
constructive algorithms
,
greedy
,
math
,
two pointers
1400
x13880
2055B
Crafting
constructive algorithms
,
greedy
,
sortings
1000
x22497
2055A
Two Frogs
constructive algorithms
,
games
,
greedy
,
math
800
x28809
2053I2
Affectionate Arrays (Hard Version)
data structures
,
dp
,
graphs
,
greedy
,
math
,
shortest paths
,
two pointers
3500
x40
2053I1
Affectionate Arrays (Easy Version)
data structures
,
dp
,
greedy
2800
x374
2053H
Delicate Anti-monotonous Operations
constructive algorithms
,
implementation
3500
x45
2053G
Naive String Splits
binary search
,
brute force
,
greedy
,
hashing
,
math
,
number theory
,
strings
3400
x183
2053F
Earnest Matrix Complement
brute force
,
data structures
,
dp
,
greedy
,
implementation
,
math
2600
x767
2053E
Resourceful Caterpillar Sequence
dfs and similar
,
dp
,
games
,
graphs
,
greedy
,
trees
1900
x3603
2053D
Refined Product Optimality
binary search
,
data structures
,
greedy
,
math
,
schedules
,
sortings
1700
x6387
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