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Before contest
Codeforces Round 940 (Div. 2) and CodeCraft-23
32:50:44
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Difficulty:
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combinatorics
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
#
Name
1930I
Counting Is Fun
combinatorics
3500
x48
1654H
Three Minimums
combinatorics
,
constructive algorithms
,
divide and conquer
,
dp
,
fft
,
math
3500
x68
1704H2
Game of AI (hard version)
combinatorics
,
fft
,
math
3500
x72
1761F2
Anti-median (Hard Version)
combinatorics
,
dp
,
math
3500
x75
1477F
Nezzar and Chocolate Bars
combinatorics
,
fft
,
math
,
probabilities
3500
x120
1696H
Maximum Product?
brute force
,
combinatorics
,
dp
,
greedy
,
implementation
,
math
,
two pointers
3500
x141
1586I
Omkar and Mosaic
combinatorics
,
constructive algorithms
,
math
3500
x154
1893E
Cacti Symphony
combinatorics
,
dfs and similar
,
dp
,
graphs
3500
x161
1835E
Old Mobile
combinatorics
,
dp
,
probabilities
3500
x196
1687E
Become Big For Me
combinatorics
,
constructive algorithms
,
greedy
,
math
,
number theory
3500
x210
1336E2
Chiori and Doll Picking (hard version)
bitmasks
,
brute force
,
combinatorics
,
math
3500
x280
1292F
Nora's Toy Boxes
bitmasks
,
combinatorics
,
dp
3500
x296
1280F
Intergalactic Sliding Puzzle
combinatorics
,
constructive algorithms
,
math
3400
x55
1844H
Multiple of Three Cycles
combinatorics
,
data structures
,
dp
,
dsu
,
math
3400
x126
804F
Fake bullions
combinatorics
,
dfs and similar
,
dp
,
graphs
,
number theory
3400
x136
773F
Test Data Generation
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
,
number theory
3400
x184
1553I
Stairs
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
3400
x194
848E
Days of Floral Colours
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
3400
x198
914H
Ember and Storm's Tree Game
combinatorics
,
dp
,
games
,
trees
3400
x225
794G
Replace All
combinatorics
,
dp
,
math
3400
x318
715E
Complete the Permutations
combinatorics
,
fft
,
graphs
,
math
3400
x340
1580F
Problems for Codeforces
combinatorics
,
fft
,
math
3300
x129
865G
Flowers and Chocolate
combinatorics
,
math
,
matrices
3300
x129
1450H2
Multithreading (Hard Version)
combinatorics
,
implementation
,
math
3300
x161
1641E
Special Positions
combinatorics
,
divide and conquer
,
fft
,
math
3300
x200
1750G
Doping
combinatorics
,
dp
,
math
3300
x222
1188E
Problem from Red Panda
combinatorics
3300
x223
1466H
Finding satisfactory solutions
combinatorics
,
dp
,
graphs
,
greedy
,
math
3300
x256
1254E
Send Tree to Charlie
combinatorics
,
dfs and similar
,
dsu
,
trees
3300
x258
1528F
AmShZ Farm
combinatorics
,
fft
,
math
3300
x271
1726G
A Certain Magical Party
combinatorics
,
data structures
,
greedy
,
sortings
3300
x278
878E
Numbers on the blackboard
combinatorics
,
dp
3300
x470
623E
Transforming Sequence
combinatorics
,
dp
,
fft
,
math
3300
x525
1403C
Chess Rush
*special problem
,
combinatorics
,
dp
,
implementation
,
math
3200
x42
756E
Byteland coins
combinatorics
,
dp
,
math
3200
x149
1704H1
Game of AI (easy version)
combinatorics
,
constructive algorithms
,
dp
,
fft
,
math
3200
x168
1470E
Strange Permutation
binary search
,
combinatorics
,
data structures
,
dp
,
graphs
,
implementation
,
two pointers
3200
x289
1774G
Segment Covering
brute force
,
combinatorics
,
constructive algorithms
,
data structures
,
dp
,
trees
3200
x358
1603E
A Perfect Problem
combinatorics
,
dp
,
math
3200
x393
1517F
Reunion
combinatorics
,
dp
,
trees
3200
x434
750G
New Year and Binary Tree Paths
bitmasks
,
brute force
,
combinatorics
,
dp
3200
x438
1608F
MEX counting
combinatorics
,
dp
,
implementation
3200
x513
755G
PolandBall and Many Other Balls
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
,
number theory
3200
x845
1954F
Unique Strings
combinatorics
,
dp
,
math
3100
x149
1951G
Clacking Balls
combinatorics
,
math
,
probabilities
3100
x191
1864G
Magic Square
combinatorics
,
constructive algorithms
,
implementation
3100
x250
1205E
Expected Value Again
combinatorics
,
strings
3100
x261
981H
K Paths
combinatorics
,
data structures
,
dp
,
fft
,
math
3100
x262
1784E
Infinite Game
brute force
,
combinatorics
,
dp
,
games
,
probabilities
3100
x297
1439D
INOI Final Contests
combinatorics
,
dp
,
fft
3100
x336
1924E
Paper Cutting Again
combinatorics
,
probabilities
3100
x380
653G
Move by Prime
combinatorics
,
math
,
number theory
3100
x512
1503E
2-Coloring
combinatorics
,
dp
,
math
3100
x590
1770F
Koxia and Sequence
bitmasks
,
combinatorics
,
dp
,
math
,
number theory
3100
x594
438E
The Child and Binary Tree
combinatorics
,
divide and conquer
,
fft
,
number theory
3100
x1769
372E
Drawing Circles is Fun
combinatorics
,
geometry
3000
x168
1743G
Antifibonacci Cut
bitmasks
,
combinatorics
,
constructive algorithms
,
data structures
,
dp
,
hashing
,
math
3000
x241
135E
Weak Subsequence
combinatorics
3000
x261
1299D
Around the World
bitmasks
,
combinatorics
,
dfs and similar
,
dp
,
graphs
,
graphs
,
math
,
trees
3000
x410
698F
Coprime Permutation
combinatorics
,
number theory
3000
x427
1707D
Partial Virtual Trees
combinatorics
,
dfs and similar
,
dp
,
math
,
trees
3000
x575
1667E
Centroid Probabilities
combinatorics
,
dp
,
fft
,
math
3000
x618
1097G
Vladislav and a Great Legend
combinatorics
,
dp
,
trees
3000
x653
1392H
ZS Shuffles Cards
combinatorics
,
dp
,
math
,
probabilities
3000
x666
506E
Mr. Kitayuta's Gift
combinatorics
,
dp
,
matrices
,
strings
3000
x678
1616H
Keep XOR Low
bitmasks
,
combinatorics
,
data structures
,
divide and conquer
,
dp
,
math
3000
x772
891E
Lust
combinatorics
,
math
,
matrices
3000
x837
1810H
Last Number
combinatorics
,
math
2900
x128
1928F
Digital Patterns
combinatorics
,
data structures
,
implementation
,
math
2900
x202
145D
Lucky Pair
combinatorics
,
data structures
,
implementation
2900
x236
217D
Bitonix' Patrol
bitmasks
,
brute force
,
combinatorics
,
dfs and similar
,
math
2900
x241
933D
A Creative Cutout
brute force
,
combinatorics
,
math
2900
x278
1605F
PalindORme
combinatorics
,
dp
2900
x283
1644F
Basis
combinatorics
,
fft
,
math
,
number theory
2900
x309
1847E
Triangle Platinum?
brute force
,
combinatorics
,
implementation
,
interactive
,
math
,
probabilities
2900
x311
776G
Sherlock and the Encrypted Data
bitmasks
,
combinatorics
,
dp
2900
x326
717A
Festival Organization
combinatorics
,
math
,
number theory
2900
x330
848D
Shake It!
combinatorics
,
dp
,
flows
,
graphs
2900
x360
917C
Pollywog
combinatorics
,
dp
,
matrices
2900
x369
1792F2
Graph Coloring (hard version)
brute force
,
combinatorics
,
divide and conquer
,
dp
,
fft
,
graphs
2900
x370
1450H1
Multithreading (Easy Version)
combinatorics
,
fft
,
math
2900
x372
1630E
Expected Components
combinatorics
,
math
,
number theory
,
probabilities
2900
x418
997D
Cycles in product
combinatorics
,
divide and conquer
,
trees
2900
x423
1747E
List Generation
combinatorics
,
dp
,
math
2900
x481
1528E
Mashtali and Hagh Trees
combinatorics
,
dp
,
trees
2900
x501
1713F
Lost Array
bitmasks
,
combinatorics
,
constructive algorithms
,
dp
,
math
2900
x504
1085G
Beautiful Matrix
combinatorics
,
data structures
,
dp
2900
x504
896D
Nephren Runs a Cinema
chinese remainder theorem
,
combinatorics
,
math
,
number theory
2900
x515
1221G
Graph And Numbers
bitmasks
,
brute force
,
combinatorics
,
dp
,
meet-in-the-middle
2900
x517
1060F
Shrinking Tree
combinatorics
,
dp
2900
x523
722E
Research Rover
combinatorics
,
dp
2900
x797
1264D2
Beautiful Bracket Sequence (hard version)
combinatorics
,
probabilities
2900
x837
960G
Bandit Blues
combinatorics
,
dp
,
fft
,
math
2900
x1021
585E
Present for Vitalik the Philatelist
combinatorics
,
math
,
number theory
2900
x1039
1285F
Classical?
binary search
,
combinatorics
,
number theory
2900
x1057
1488H
Build From Suffixes
*special problem
,
combinatorics
,
data structures
2800
x52
1725I
Imitating the Key Tree
combinatorics
,
dsu
,
trees
2800
x182
1773G
Game of Questions
bitmasks
,
combinatorics
,
dp
,
fft
,
math
,
probabilities
2800
x318
1942G
Bessie and Cards
combinatorics
,
dp
,
math
2800
x336
762F
Tree nesting
combinatorics
,
graphs
,
trees
2800
x344
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