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Codeforces Round 940 (Div. 2) and CodeCraft-23
2 days
Register now »
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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
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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Custom test
Problems
#
Name
1426E
Rock, Paper, Scissors
brute force
,
constructive algorithms
,
flows
,
greedy
,
math
1800
x7210
1426D
Non-zero Segments
constructive algorithms
,
data structures
,
greedy
,
sortings
1500
x15435
1426C
Increase and Copy
binary search
,
constructive algorithms
,
math
1100
x18993
1426B
Symmetric Matrix
implementation
900
x20325
1426A
Floor Number
implementation
,
math
800
x45265
1425I
Impressive Harvesting of The Orchard
data structures
2800
x226
1425H
Huge Boxes of Animal Toys
constructive algorithms
1300
x4073
1425F
Flamingoes of Mystery
interactive
1400
x5135
1425E
Excitation of Atoms
greedy
,
implementation
2200
x905
1425D
Danger of Mad Snakes
combinatorics
,
dp
,
math
2300
x801
1425C
Captain of Knights
math
3100
x36
1425B
Blue and Red of Our Faculty!
divide and conquer
,
dp
2600
x272
1425A
Arena of Greed
games
,
greedy
1400
x6324
1424M
Ancient Language
graphs
,
sortings
2200
x519
1424G
Years
data structures
,
sortings
1300
x5633
1423N
BubbleSquare Tokens
3500
x143
1423M
Milutin's Plums
interactive
2800
x144
1423L
Light switches
meet-in-the-middle
2600
x428
1423K
Lonely Numbers
binary search
,
math
,
number theory
,
two pointers
1600
x4644
1423J
Bubble Cup hypothesis
bitmasks
,
constructive algorithms
,
dp
,
math
2400
x728
1423I
Lookup Tables
bitmasks
3000
x100
1423H
Virus
data structures
,
divide and conquer
,
dsu
,
graphs
2500
x505
1423G
Growing flowers
data structures
3500
x173
1423F
Coins
math
2700
x359
1423E
5G Antenna Towers
geometry
2700
x73
1423D
Does anyone else hate the wind?
3100
x34
1423C
Dušan's Railway
divide and conquer
,
graphs
,
trees
3500
x129
1423B
Valuable Paper
binary search
,
flows
,
graph matchings
,
graphs
1900
x1758
1423A
Wakanda Forever
3500
x65
1422F
Boring Queries
data structures
,
math
,
number theory
2700
x959
1422E
Minlexes
dp
,
greedy
,
implementation
,
strings
2700
x726
1422D
Returning Home
graphs
,
shortest paths
,
sortings
2300
x2582
1422C
Bargain
combinatorics
,
dp
,
math
1700
x8061
1422B
Nice Matrix
greedy
,
implementation
,
math
1300
x14162
1422A
Fence
geometry
,
math
800
x20601
1421E
Swedish Heroes
brute force
,
dp
,
implementation
2700
x668
1421D
Hexagons
brute force
,
constructive algorithms
,
greedy
,
implementation
,
math
,
shortest paths
1900
x4045
1421C
Palindromifier
constructive algorithms
,
strings
1400
x12460
1421B
Putting Bricks in the Wall
constructive algorithms
,
implementation
1100
x12871
1421A
XORwice
bitmasks
,
greedy
,
math
800
x26900
1420E
Battle Lemmings
dp
,
greedy
2500
x838
1420D
Rescue Nibel!
combinatorics
,
data structures
,
sortings
1800
x7286
1420C2
Pokémon Army (hard version)
data structures
,
divide and conquer
,
dp
,
greedy
,
implementation
2100
x4481
1420C1
Pokémon Army (easy version)
constructive algorithms
,
dp
,
greedy
1300
x16974
1420B
Rock and Lever
bitmasks
,
math
1200
x23428
1420A
Cubes Sorting
math
,
sortings
900
x22796
1419F
Rain of Fire
binary search
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
implementation
2800
x473
1419E
Decryption
constructive algorithms
,
implementation
,
math
,
number theory
2100
x3131
1419D2
Sage's Birthday (hard version)
binary search
,
brute force
,
constructive algorithms
,
greedy
,
sortings
,
two pointers
1500
x14577
1419D1
Sage's Birthday (easy version)
binary search
,
constructive algorithms
,
greedy
,
sortings
1000
x23480
1419C
Killjoy
greedy
,
implementation
,
math
1500
x14859
1419B
Stairs
brute force
,
constructive algorithms
,
greedy
,
implementation
,
math
1200
x15934
1419A
Digit Game
games
,
greedy
,
implementation
900
x19223
1418G
Three Occurrences
data structures
,
divide and conquer
,
hashing
,
two pointers
2500
x1447
1418F
Equal Product
data structures
,
math
,
number theory
,
two pointers
3000
x348
1418E
Expected Damage
binary search
,
combinatorics
,
probabilities
2400
x1716
1418D
Trash Problem
data structures
,
implementation
2100
x4161
1418C
Mortal Kombat Tower
dp
,
graphs
,
greedy
,
shortest paths
1500
x18010
1418B
Negative Prefixes
greedy
,
sortings
1300
x16254
1418A
Buying Torches
math
1000
x21206
1417B
Two Arrays
greedy
,
math
,
sortings
1100
x14310
1417A
Copy-paste
greedy
,
math
800
x18030
1416F
Showing Off
flows
,
graph matchings
,
greedy
,
implementation
3300
x358
1416E
Split
binary search
,
data structures
,
dp
,
greedy
3200
x267
1416D
Graph and Queries
data structures
,
dsu
,
graphs
,
implementation
,
trees
2600
x1812
1416C
XOR Inverse
bitmasks
,
data structures
,
divide and conquer
,
dp
,
greedy
,
math
,
sortings
,
strings
,
trees
2000
x4154
1416B
Make Them Equal
constructive algorithms
,
greedy
,
math
2000
x5885
1416A
k-Amazing Numbers
binary search
,
data structures
,
implementation
,
two pointers
1500
x11655
1415F
Cakes for Clones
dp
2900
x398
1415E
New Game Plus!
constructive algorithms
,
greedy
,
math
2200
x2567
1415D
XOR-gun
bitmasks
,
brute force
,
constructive algorithms
2000
x5147
1415C
Bouncing Ball
brute force
,
dp
,
implementation
1400
x10622
1415B
Repainting Street
brute force
,
brute force
,
greedy
1100
x11989
1415A
Prison Break
brute force
,
math
800
x14914
1413F
Roads and Ramen
data structures
,
trees
2800
x695
1413E
Solo mid Oracle
greedy
,
math
,
ternary search
2100
x1902
1413D
Shurikens
data structures
,
greedy
,
implementation
1700
x6322
1413C
Perform Easily
binary search
,
brute force
,
dp
,
implementation
,
sortings
,
two pointers
1900
x5523
1413B
A New Technique
implementation
1100
x11594
1413A
Finding Sasuke
constructive algorithms
,
math
800
x14574
1411G
No Game No Life
bitmasks
,
games
,
math
,
matrices
2700
x574
1411F
The Thorny Path
greedy
,
math
3000
x316
1411E
Poman Numbers
bitmasks
,
greedy
,
math
,
strings
2300
x1551
1411D
Grime Zoo
brute force
,
greedy
,
implementation
,
strings
2100
x2420
1411C
Peaceful Rooks
dfs and similar
,
dsu
,
graphs
1700
x7746
1411B
Fair Numbers
brute force
,
number theory
1000
x17653
1411A
In-game Chat
implementation
800
x20123
1409F
Subsequences of Length Two
dp
,
strings
2100
x4259
1409E
Two Platforms
binary search
,
dp
,
sortings
,
two pointers
1800
x7526
1409D
Decrease the Sum of Digits
greedy
,
math
1500
x18606
1409C
Yet Another Array Restoration
brute force
,
math
,
number theory
1200
x22692
1409B
Minimum Product
brute force
,
greedy
,
math
1100
x28175
1409A
Yet Another Two Integers Problem
greedy
,
math
800
x62112
1408I
Bitwise Magic
dp
,
math
3200
x163
1408H
Rainbow Triples
binary search
,
data structures
,
flows
,
greedy
3300
x347
1408G
Clusterization Counting
combinatorics
,
dp
,
dsu
,
fft
,
graphs
,
trees
2700
x917
1408F
Two Different
constructive algorithms
,
divide and conquer
2300
x2255
1408E
Avoid Rainbow Cycles
data structures
,
dsu
,
graphs
,
greedy
,
sortings
,
trees
2400
x1872
1408D
Searchlights
binary search
,
brute force
,
data structures
,
dp
,
implementation
,
sortings
,
two pointers
2000
x4151
1408C
Discrete Acceleration
binary search
,
dp
,
implementation
,
math
,
two pointers
1500
x8607
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