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Before contest
Codeforces Round 941 (Div. 1)
30:51:15
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*has extra registration
Before contest
Codeforces Round 941 (Div. 2)
30:51:15
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constructive algorithms
combine-tags-by-or
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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
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implementation
interactive
math
matrices
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probabilities
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sortings
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Problems
#
Name
1614A
Divan and a Store
brute force
,
constructive algorithms
,
greedy
800
x23016
1779B
MKnez's ConstructiveForces Task
constructive algorithms
,
math
900
x22952
1665A
GCD vs LCM
constructive algorithms
,
math
800
x22901
1779A
Hall of Fame
constructive algorithms
,
greedy
,
strings
800
x22867
1828A
Divisible Array
constructive algorithms
,
math
800
x22852
1772C
Different Differences
constructive algorithms
,
greedy
,
math
1000
x22624
1367C
Social Distance
constructive algorithms
,
greedy
,
math
1300
x22570
1706A
Another String Minimization Problem
2-sat
,
constructive algorithms
,
greedy
,
string suffix structures
,
strings
800
x22533
1700A
Optimal Path
constructive algorithms
,
greedy
,
math
800
x22525
1617B
GCD Problem
brute force
,
constructive algorithms
,
math
,
number theory
900
x22346
1365C
Rotation Matching
constructive algorithms
,
data structures
,
greedy
,
implementation
1400
x22190
1955B
Progressive Square
constructive algorithms
,
data structures
,
implementation
,
sortings
1000
x22167
1705B
Mark the Dust Sweeper
constructive algorithms
,
greedy
,
implementation
900
x22130
1542B
Plus and Multiply
constructive algorithms
,
math
,
number theory
1500
x21983
1918B
Minimize Inversions
constructive algorithms
,
data structures
,
greedy
,
implementation
,
sortings
900
x21932
1511B
GCD Length
constructive algorithms
,
math
,
number theory
1100
x21922
1774A
Add Plus Minus Sign
constructive algorithms
,
math
800
x21915
1743B
Permutation Value
constructive algorithms
,
greedy
800
x21895
1858C
Yet Another Permutation Problem
constructive algorithms
,
greedy
,
math
,
number theory
1000
x21853
300A
Array
brute force
,
constructive algorithms
,
implementation
1100
x21837
1905A
Constructive Problems
constructive algorithms
,
math
800
x21698
1433D
Districts Connection
constructive algorithms
,
dfs and similar
1200
x21689
1512D
Corrupted Array
constructive algorithms
,
data structures
,
greedy
1200
x21640
1747B
BAN BAN
constructive algorithms
900
x21537
1900A
Cover in Water
constructive algorithms
,
greedy
,
implementation
,
strings
800
x21508
1504A
Déjà Vu
constructive algorithms
,
strings
800
x21383
1739B
Array Recovery
constructive algorithms
,
greedy
,
math
1100
x21354
1574A
Regular Bracket Sequences
constructive algorithms
800
x21275
1405A
Permutation Forgery
constructive algorithms
800
x21235
1712B
Woeful Permutation
constructive algorithms
,
greedy
,
number theory
800
x21209
1455B
Jumps
constructive algorithms
,
math
1200
x21207
1638A
Reverse
constructive algorithms
,
greedy
,
math
800
x21188
1716B
Permutation Chain
constructive algorithms
,
math
800
x21179
1620A
Equal or Not Equal
constructive algorithms
,
dsu
,
implementation
800
x21174
1691B
Shoe Shuffling
constructive algorithms
,
greedy
,
implementation
,
two pointers
1000
x21154
1890A
Doremy's Paint 3
constructive algorithms
800
x21113
1837C
Best Binary String
constructive algorithms
,
greedy
1000
x21051
1879B
Chips on the Board
constructive algorithms
,
greedy
900
x21045
1780A
Hayato and School
constructive algorithms
,
greedy
800
x21042
798A
Mike and palindrome
brute force
,
constructive algorithms
,
strings
1000
x21022
1838A
Blackboard List
constructive algorithms
,
math
800
x21012
1499A
Domino on Windowsill
combinatorics
,
constructive algorithms
,
math
800
x21002
1405B
Array Cancellation
constructive algorithms
,
implementation
1000
x20933
1646B
Quality vs Quantity
brute force
,
constructive algorithms
,
greedy
,
sortings
,
two pointers
800
x20842
1579E1
Permutation Minimization by Deque
constructive algorithms
,
greedy
,
math
1000
x20818
1555C
Coin Rows
brute force
,
constructive algorithms
,
dp
,
implementation
1300
x20803
1632B
Roof Construction
bitmasks
,
constructive algorithms
1000
x20755
1401B
Ternary Sequence
constructive algorithms
,
greedy
,
math
1100
x20725
1860A
Not a Substring
constructive algorithms
,
strings
900
x20723
1521B
Nastia and a Good Array
constructive algorithms
,
math
,
number theory
1300
x20710
1713B
Optimal Reduction
constructive algorithms
,
sortings
1000
x20705
1506D
Epic Transformation
constructive algorithms
,
data structures
,
greedy
1400
x20656
1698B
Rising Sand
constructive algorithms
,
greedy
,
implementation
800
x20635
1684B
Z mod X = C
constructive algorithms
,
math
800
x20583
1430A
Number of Apartments
brute force
,
constructive algorithms
,
math
900
x20443
1644B
Anti-Fibonacci Permutation
brute force
,
constructive algorithms
,
implementation
800
x20432
682A
Alyona and Numbers
constructive algorithms
,
math
,
number theory
1100
x20405
1375C
Element Extermination
constructive algorithms
,
data structures
,
greedy
1400
x20402
1496A
Split it!
brute force
,
constructive algorithms
,
greedy
,
strings
900
x20236
1436B
Prime Square
constructive algorithms
,
math
900
x20196
1658A
Marin and Photoshoot
constructive algorithms
,
implementation
,
math
800
x20122
1407A
Ahahahahahahahaha
constructive algorithms
,
math
1100
x20063
1758B
XOR = Average
constructive algorithms
900
x20053
1536A
Omkar and Bad Story
brute force
,
constructive algorithms
800
x20024
1715B
Beautiful Array
constructive algorithms
,
greedy
,
math
1000
x20019
1515A
Phoenix and Gold
constructive algorithms
,
greedy
,
math
800
x19994
1861B
Two Binary Strings
constructive algorithms
,
dp
,
greedy
1000
x19983
513A
Game
constructive algorithms
,
math
800
x19915
1728B
Best Permutation
constructive algorithms
,
greedy
800
x19902
1735A
Working Week
constructive algorithms
,
greedy
,
math
800
x19866
1381A1
Prefix Flip (Easy Version)
constructive algorithms
,
data structures
,
strings
1300
x19824
1864A
Increasing and Decreasing
constructive algorithms
,
greedy
,
implementation
,
math
800
x19728
1352G
Special Permutation
constructive algorithms
1600
x19709
1454D
Number into Sequence
constructive algorithms
,
math
,
number theory
1300
x19683
1902A
Binary Imbalance
constructive algorithms
800
x19656
1559C
Mocha and Hiking
constructive algorithms
,
graphs
1200
x19651
1740A
Factorise N+M
constructive algorithms
,
number theory
800
x19562
1746A
Maxmina
constructive algorithms
,
greedy
800
x19426
1708B
Difference of GCDs
constructive algorithms
,
math
1100
x19424
1512C
A-B Palindrome
constructive algorithms
,
implementation
,
strings
1200
x19421
1729C
Jumping on Tiles
constructive algorithms
,
strings
1100
x19354
1651B
Prove Him Wrong
constructive algorithms
,
greedy
800
x19338
1794B
Not Dividing
constructive algorithms
,
greedy
,
math
900
x19326
1775A1
Gardener and the Capybaras (easy version)
brute force
,
constructive algorithms
,
implementation
800
x19288
401C
Team
constructive algorithms
,
greedy
,
implementation
1400
x19244
776B
Sherlock and his girlfriend
constructive algorithms
,
number theory
1200
x19232
1733B
Rule of League
constructive algorithms
,
math
900
x19221
1455C
Ping-pong
constructive algorithms
,
games
,
math
1100
x19205
1788B
Sum of Two Numbers
constructive algorithms
,
greedy
,
implementation
,
math
,
probabilities
1100
x19183
1513A
Array and Peaks
constructive algorithms
,
implementation
800
x19167
1562B
Scenes From a Memory
brute force
,
constructive algorithms
,
implementation
,
math
,
number theory
1000
x19150
1867A
green_gold_dog, array and permutation
constructive algorithms
,
sortings
800
x19139
1699B
Almost Ternary Matrix
bitmasks
,
constructive algorithms
,
matrices
900
x19136
1493A
Anti-knapsack
constructive algorithms
,
greedy
800
x19096
1438A
Specific Tastes of Andre
constructive algorithms
,
implementation
800
x19089
1566B
MIN-MEX Cut
bitmasks
,
constructive algorithms
,
dp
,
greedy
800
x19057
1426C
Increase and Copy
binary search
,
constructive algorithms
,
math
1100
x19005
1770B
Koxia and Permutation
constructive algorithms
1000
x18991
1368B
Codeforces Subsequences
brute force
,
constructive algorithms
,
greedy
,
math
,
strings
1500
x18987
1954A
Painting the Ribbon
constructive algorithms
,
greedy
,
math
900
x18985
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