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Before contest
Codeforces Round 941 (Div. 1)
01:23:11
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Before contest
Codeforces Round 941 (Div. 2)
01:23:11
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sortings
combine-tags-by-or
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2-sat
binary search
bitmasks
brute force
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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
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number theory
probabilities
schedules
shortest paths
sortings
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strings
ternary search
trees
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Problems
#
Name
1707B
Difference Array
brute force
,
data structures
,
implementation
,
sortings
1900
x5522
1705D
Mark and Lightbulbs
combinatorics
,
constructive algorithms
,
greedy
,
math
,
sortings
1800
x6085
1705A
Mark the Photographer
greedy
,
sortings
800
x24789
1704C
Virus
greedy
,
implementation
,
sortings
1200
x14350
1703F
Yet Another Problem About Pairs Satisfying an Inequality
binary search
,
data structures
,
dp
,
greedy
,
sortings
1300
x18062
1701D
Permutation Restoration
binary search
,
data structures
,
greedy
,
math
,
sortings
,
two pointers
1900
x5470
1698E
PermutationForces II
brute force
,
combinatorics
,
greedy
,
sortings
,
trees
,
two pointers
2300
x1567
1697B
Promo
greedy
,
sortings
900
x25407
1692G
2^Sort
data structures
,
dp
,
sortings
,
two pointers
1400
x15836
1692B
All Distinct
greedy
,
sortings
800
x32655
1691E
Number of Groups
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
2300
x1742
1690G
Count the Trains
binary search
,
data structures
,
greedy
,
sortings
2000
x3219
1689A
Lex String
brute force
,
greedy
,
implementation
,
sortings
,
two pointers
800
x16363
1688B
Patchouli's Magical Talisman
bitmasks
,
constructive algorithms
,
greedy
,
sortings
800
x17836
1687C
Sanae and Giant Robot
binary search
,
brute force
,
data structures
,
dsu
,
greedy
,
sortings
2500
x1335
1687B
Railway System
constructive algorithms
,
graphs
,
greedy
,
interactive
,
sortings
1700
x3477
1685B
Linguistics
greedy
,
implementation
,
sortings
,
strings
2000
x3150
1685A
Circular Local MiniMax
constructive algorithms
,
greedy
,
sortings
1100
x16448
1684D
Traps
constructive algorithms
,
greedy
,
sortings
1700
x9284
1684C
Column Swapping
brute force
,
constructive algorithms
,
greedy
,
implementation
,
sortings
1400
x12003
1682F
MCMF?
data structures
,
flows
,
graphs
,
greedy
,
sortings
,
two pointers
2700
x285
1682E
Unordered Swaps
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
math
,
sortings
,
trees
2700
x558
1682B
AND Sorting
bitmasks
,
constructive algorithms
,
sortings
1100
x17104
1681C
Double Sort
implementation
,
sortings
1200
x16936
1676H2
Maximum Crossings (Hard Version)
data structures
,
divide and conquer
,
sortings
1500
x9980
1676F
Longest Strike
data structures
,
greedy
,
implementation
,
sortings
,
two pointers
1300
x15744
1676E
Eating Queries
binary search
,
greedy
,
sortings
1100
x24524
1676B
Equal Candies
greedy
,
math
,
sortings
800
x44911
1674D
A-B-C Sort
constructive algorithms
,
implementation
,
sortings
1200
x15743
1671E
Preorder
combinatorics
,
divide and conquer
,
dp
,
dsu
,
hashing
,
sortings
,
trees
2100
x2640
1671B
Consecutive Points Segment
brute force
,
math
,
sortings
1000
x18093
1670A
Prof. Slim
greedy
,
implementation
,
sortings
800
x15228
1669B
Triple
implementation
,
sortings
800
x39667
1668B
Social Distance
greedy
,
math
,
sortings
900
x16304
1665C
Tree Infection
binary search
,
greedy
,
sortings
,
trees
1600
x8027
1665B
Array Cloning Technique
constructive algorithms
,
greedy
,
sortings
900
x18634
1662N
Drone Photo
combinatorics
,
math
,
sortings
x687
1662I
Ice Cream Shop
brute force
,
implementation
,
sortings
x1950
1658E
Gojou and Matrix Game
data structures
,
dp
,
games
,
hashing
,
implementation
,
math
,
number theory
,
sortings
2500
x1002
1657D
For Gamers. By Gamers.
binary search
,
brute force
,
greedy
,
math
,
sortings
2000
x4695
1656F
Parametric MST
binary search
,
constructive algorithms
,
graphs
,
greedy
,
math
,
sortings
2600
x985
1656C
Make Equal With Mod
constructive algorithms
,
math
,
number theory
,
sortings
1200
x18447
1656A
Good Pairs
math
,
sortings
800
x19225
1654F
Minimal String Xoration
bitmasks
,
data structures
,
divide and conquer
,
greedy
,
hashing
,
sortings
,
strings
2800
x1050
1654C
Alice and the Cake
data structures
,
greedy
,
implementation
,
sortings
1400
x13141
1654A
Maximum Cake Tastiness
brute force
,
greedy
,
implementation
,
sortings
800
x18401
1650E
Rescheduling the Exam
binary search
,
data structures
,
greedy
,
implementation
,
math
,
sortings
1900
x4004
1650C
Weight of the System of Nested Segments
greedy
,
hashing
,
implementation
,
sortings
1200
x16340
1648A
Weird Sum
combinatorics
,
data structures
,
geometry
,
math
,
matrices
,
sortings
1400
x11694
1646B
Quality vs Quantity
brute force
,
constructive algorithms
,
greedy
,
sortings
,
two pointers
800
x20846
1641C
Anonymity Is Important
binary search
,
brute force
,
data structures
,
dsu
,
greedy
,
sortings
2200
x2317
1641B
Repetitions Decoding
constructive algorithms
,
implementation
,
sortings
2000
x3724
1641A
Great Sequence
brute force
,
greedy
,
sortings
1200
x17481
1638B
Odd Swap Sort
data structures
,
math
,
sortings
1100
x20372
1637H
Minimize Inversions Number
data structures
,
greedy
,
math
,
sortings
3500
x300
1637A
Sorting Parts
brute force
,
sortings
800
x22058
1635E
Cars
2-sat
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
2200
x2161
1633E
Spanning Tree Queries
binary search
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
,
sortings
,
trees
2400
x1455
1630C
Paint the Middle
dp
,
greedy
,
sortings
,
two pointers
2200
x2825
1629A
Download More RAM
brute force
,
greedy
,
sortings
800
x28525
1628F
Spaceship Crisis Management
binary search
,
data structures
,
geometry
,
sortings
3500
x84
1627B
Not Sitting
games
,
greedy
,
sortings
1300
x16245
1626A
Equidistant Letters
constructive algorithms
,
sortings
800
x28307
1625D
Binary Spiders
bitmasks
,
data structures
,
implementation
,
math
,
sortings
,
trees
2300
x1964
1625B
Elementary Particles
brute force
,
greedy
,
sortings
1100
x15847
1624D
Palindromes Coloring
binary search
,
greedy
,
sortings
,
strings
1400
x16202
1623B
Game on Ranges
brute force
,
dfs and similar
,
implementation
,
sortings
1100
x13891
1622C
Set or Decrease
binary search
,
brute force
,
greedy
,
sortings
1600
x12324
1622B
Berland Music
data structures
,
greedy
,
math
,
sortings
1000
x20515
1621E
New School
binary search
,
data structures
,
dp
,
greedy
,
implementation
,
sortings
2300
x1710
1619G
Unusual Minesweeper
binary search
,
dfs and similar
,
dsu
,
greedy
,
sortings
2000
x2259
1619E
MEX and Increments
constructive algorithms
,
data structures
,
dp
,
greedy
,
implementation
,
math
,
sortings
1700
x8639
1619D
New Year's Problem
binary search
,
greedy
,
sortings
1800
x7226
1618G
Trader Problem
data structures
,
dsu
,
greedy
,
sortings
2200
x1473
1618A
Polycarp and Sums of Subsequences
math
,
sortings
800
x31490
1617C
Paprika and Permutation
binary search
,
greedy
,
math
,
sortings
1300
x14433
1617A
Forbidden Subsequence
constructive algorithms
,
greedy
,
sortings
,
strings
800
x16080
1615E
Purple Crayon
data structures
,
dfs and similar
,
games
,
graphs
,
greedy
,
math
,
sortings
,
trees
2400
x1394
1614B
Divan and a New Project
constructive algorithms
,
sortings
1000
x17808
1613B
Absent Remainder
greedy
,
implementation
,
sortings
1000
x21151
1612G
Max Sum Array
combinatorics
,
constructive algorithms
,
greedy
,
sortings
2500
x815
1612E
Messages
brute force
,
dp
,
greedy
,
probabilities
,
sortings
2000
x2387
1608E
The Cells on the Paper
binary search
,
implementation
,
sortings
2800
x423
1607H
Banquet Preparations 2
greedy
,
sortings
,
two pointers
2200
x1187
1607D
Blue-Red Permutation
greedy
,
math
,
sortings
1300
x16364
1607C
Minimum Extraction
brute force
,
sortings
1000
x24274
1606D
Red-Blue Matrix
brute force
,
constructive algorithms
,
implementation
,
sortings
2400
x1398
1605E
Array Equalizer
binary search
,
greedy
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2400
x995
1605B
Reverse Sort
greedy
,
sortings
1000
x17615
1601D
Difficult Mountain
data structures
,
dp
,
greedy
,
sortings
2700
x1364
1601C
Optimal Insertion
data structures
,
divide and conquer
,
dp
,
greedy
,
sortings
2300
x1914
1592B
Hemose Shopping
constructive algorithms
,
dsu
,
math
,
sortings
1200
x15558
1592A
Gamer Hemose
binary search
,
greedy
,
math
,
sortings
800
x21555
1584C
Two Arrays
greedy
,
math
,
sortings
900
x15840
1583H
Omkar and Tours
data structures
,
divide and conquer
,
sortings
,
trees
3300
x313
1579B
Shifting Sort
implementation
,
sortings
1100
x17785
1575L
Longest Array Deconstruction
data structures
,
divide and conquer
,
dp
,
sortings
2100
x1224
1575A
Another Sorting Problem
data structures
,
sortings
,
strings
1100
x4214
1574C
Slay the Dragon
binary search
,
greedy
,
sortings
,
ternary search
1300
x16486
1573B
Swaps
greedy
,
math
,
sortings
1400
x14135
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