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Before contest
Codeforces Round 941 (Div. 1)
3 days
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*has extra registration
Before contest
Codeforces Round 941 (Div. 2)
3 days
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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
#
Name
1619H
Permutation and Queries
brute force
,
data structures
,
divide and conquer
,
two pointers
2400
x1065
1619G
Unusual Minesweeper
binary search
,
dfs and similar
,
dsu
,
greedy
,
sortings
2000
x2258
1619F
Let's Play the Hat?
brute force
,
constructive algorithms
,
greedy
,
math
2000
x1999
1619E
MEX and Increments
constructive algorithms
,
data structures
,
dp
,
greedy
,
implementation
,
math
,
sortings
1700
x8634
1619D
New Year's Problem
binary search
,
greedy
,
sortings
1800
x7222
1619C
Wrong Addition
implementation
1200
x20207
1619B
Squares and Cubes
implementation
,
math
800
x29984
1619A
Square String?
implementation
,
strings
800
x48026
1618G
Trader Problem
data structures
,
dsu
,
greedy
,
sortings
2200
x1473
1618F
Reverse
bitmasks
,
constructive algorithms
,
dfs and similar
,
implementation
,
math
,
strings
2000
x4014
1618E
Singers' Tour
constructive algorithms
,
math
1700
x6931
1618D
Array and Operations
dp
,
greedy
,
math
1300
x18225
1618C
Paint the Array
math
1100
x21336
1618B
Missing Bigram
implementation
800
x22248
1618A
Polycarp and Sums of Subsequences
math
,
sortings
800
x31475
1617E
Christmas Chocolates
dfs and similar
,
dp
,
games
,
graphs
,
implementation
,
math
,
number theory
,
shortest paths
,
trees
2700
x827
1617D2
Too Many Impostors (hard version)
constructive algorithms
,
implementation
,
interactive
,
math
2400
x1702
1617D1
Too Many Impostors (easy version)
constructive algorithms
,
implementation
,
interactive
1800
x4516
1617C
Paprika and Permutation
binary search
,
greedy
,
math
,
sortings
1300
x14428
1617B
GCD Problem
brute force
,
constructive algorithms
,
math
,
number theory
900
x22334
1617A
Forbidden Subsequence
constructive algorithms
,
greedy
,
sortings
,
strings
800
x16078
1616H
Keep XOR Low
bitmasks
,
combinatorics
,
data structures
,
divide and conquer
,
dp
,
math
3000
x778
1616G
Just Add an Edge
dfs and similar
,
dp
,
graphs
3500
x234
1616F
Tricolor Triangles
brute force
,
graphs
,
math
,
matrices
2900
x582
1616E
Lexicographically Small Enough
brute force
,
data structures
,
greedy
,
strings
2200
x2379
1616D
Keep the Average High
dp
,
greedy
,
math
2000
x4690
1616C
Representative Edges
brute force
,
geometry
,
implementation
,
math
1500
x11938
1616B
Mirror in the String
greedy
,
strings
1100
x19056
1616A
Integer Diversity
implementation
800
x22408
1615H
Reindeer Games
binary search
,
constructive algorithms
,
data structures
,
divide and conquer
,
flows
,
graphs
,
shortest paths
3000
x307
1615G
Maximum Adjacent Pairs
constructive algorithms
,
graph matchings
3300
x147
1615F
LEGOndary Grandmaster
combinatorics
,
dp
,
math
2800
x738
1615E
Purple Crayon
data structures
,
dfs and similar
,
games
,
graphs
,
greedy
,
math
,
sortings
,
trees
2400
x1394
1615D
X(or)-mas Tree
bitmasks
,
dfs and similar
,
dsu
,
graphs
,
trees
2200
x1835
1615C
Menorah
brute force
,
graphs
,
greedy
,
math
1600
x8029
1615B
And It's Non-Zero
bitmasks
,
greedy
,
math
1300
x15140
1615A
Closing The Gap
greedy
,
math
800
x20474
1614E
Divan and a Cottage
binary search
,
data structures
2600
x807
1614D2
Divan and Kostomuksha (hard version)
dp
,
number theory
2300
x2171
1614D1
Divan and Kostomuksha (easy version)
dp
,
number theory
2100
x3645
1614C
Divan and bitwise operations
bitmasks
,
combinatorics
,
constructive algorithms
,
dp
,
math
1500
x9897
1614B
Divan and a New Project
constructive algorithms
,
sortings
1000
x17794
1614A
Divan and a Store
brute force
,
constructive algorithms
,
greedy
800
x23016
1613F
Tree Coloring
combinatorics
,
divide and conquer
,
fft
2600
x664
1613E
Crazy Robot
dfs and similar
,
graphs
2000
x4977
1613D
MEX Sequences
dp
,
math
1900
x4426
1613C
Poisoned Dagger
binary search
1200
x22441
1613B
Absent Remainder
greedy
,
implementation
,
sortings
1000
x21128
1613A
Long Comparison
implementation
,
math
900
x23911
1612G
Max Sum Array
combinatorics
,
constructive algorithms
,
greedy
,
sortings
2500
x813
1612F
Armor and Weapons
brute force
,
dp
,
greedy
,
shortest paths
2800
x560
1612E
Messages
brute force
,
dp
,
greedy
,
probabilities
,
sortings
2000
x2386
1612D
X-Magic Pair
math
,
number theory
1600
x8807
1612C
Chat Ban
binary search
,
math
1300
x15714
1612B
Special Permutation
constructive algorithms
,
greedy
900
x16859
1612A
Distance
brute force
,
constructive algorithms
800
x17461
1611G
Robot and Candies
data structures
,
graph matchings
,
greedy
2500
x605
1611F
ATM and Students
binary search
,
data structures
,
two pointers
1800
x6158
1611E2
Escape The Maze (hard version)
dfs and similar
,
dp
,
greedy
,
shortest paths
,
trees
1900
x3629
1611E1
Escape The Maze (easy version)
dfs and similar
,
greedy
,
shortest paths
,
trees
,
two pointers
1700
x6910
1611D
Weights Assignment For Tree Edges
constructive algorithms
,
trees
1500
x9470
1611C
Polycarp Recovers the Permutation
constructive algorithms
1000
x17894
1611B
Team Composition: Programmers and Mathematicians
binary search
,
constructive algorithms
,
math
800
x28358
1611A
Make Even
constructive algorithms
,
math
800
x30527
1610I
Mashtali vs AtCoder
games
,
trees
3100
x256
1610H
Squid Game
data structures
,
dfs and similar
,
greedy
,
trees
3100
x394
1610G
AmShZ Wins a Bet
data structures
,
greedy
,
hashing
3300
x367
1610F
Mashtali: a Space Oddysey
constructive algorithms
,
dfs and similar
,
graphs
3000
x492
1610E
AmShZ and G.O.A.T.
binary search
,
brute force
,
greedy
,
implementation
,
math
2300
x1622
1610D
Not Quite Lee
combinatorics
,
dp
,
math
,
number theory
2000
x2574
1610C
Keshi Is Throwing a Party
binary search
,
greedy
1600
x10635
1610B
Kalindrome Array
greedy
,
two pointers
1100
x14693
1610A
Anti Light's Cell Guessing
math
900
x15772
1609H
Pushing Robots
3500
x86
1609G
A Stroll Around the Matrix
data structures
,
greedy
,
math
3000
x361
1609F
Interesting Sections
data structures
,
divide and conquer
,
meet-in-the-middle
,
two pointers
2800
x723
1609E
William The Oblivious
bitmasks
,
data structures
,
dp
,
matrices
2400
x1835
1609D
Social Network
dsu
,
graphs
,
greedy
,
implementation
,
trees
1600
x6896
1609C
Complex Market Analysis
binary search
,
dp
,
implementation
,
number theory
,
schedules
,
two pointers
1400
x9462
1609B
William the Vigilant
implementation
,
strings
1100
x11492
1609A
Divide and Multiply
greedy
,
implementation
,
math
,
number theory
900
x16639
1608G
Alphabetic Tree
binary search
,
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
3500
x147
1608F
MEX counting
combinatorics
,
dp
,
implementation
3200
x515
1608E
The Cells on the Paper
binary search
,
implementation
,
sortings
2800
x423
1608D
Dominoes
combinatorics
,
fft
,
graphs
,
math
,
number theory
2400
x1346
1608C
Game Master
data structures
,
dfs and similar
,
dp
,
graphs
,
greedy
,
two pointers
1700
x6405
1608B
Build the Permutation
constructive algorithms
,
greedy
1200
x11417
1608A
Find Array
constructive algorithms
,
math
800
x18678
1607H
Banquet Preparations 2
greedy
,
sortings
,
two pointers
2200
x1187
1607G
Banquet Preparations 1
greedy
2200
x1506
1607F
Robot on the Board 2
brute force
,
dfs and similar
,
graphs
,
implementation
2300
x1881
1607E
Robot on the Board 1
implementation
1600
x9014
1607D
Blue-Red Permutation
greedy
,
math
,
sortings
1300
x16355
1607C
Minimum Extraction
brute force
,
sortings
1000
x24262
1607B
Odd Grasshopper
math
900
x24444
1607A
Linear Keyboard
implementation
,
strings
800
x35920
1606F
Tree Queries
brute force
,
dp
,
trees
2800
x511
1606E
Arena
combinatorics
,
dp
,
math
2100
x3323
1606D
Red-Blue Matrix
brute force
,
constructive algorithms
,
implementation
,
sortings
2400
x1398
1606C
Banknotes
greedy
,
number theory
1400
x13708
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