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Before contest
Codeforces Round 946 (Div. 3)
25:10:31
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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
x51
1967E2
Again Counting Arrays (Hard Version)
combinatorics
,
dp
,
math
3500
x56
1654H
Three Minimums
combinatorics
,
constructive algorithms
,
divide and conquer
,
dp
,
fft
,
math
3500
x70
1704H2
Game of AI (hard version)
combinatorics
,
fft
,
math
3500
x76
1761F2
Anti-median (Hard Version)
combinatorics
,
dp
,
math
3500
x77
1477F
Nezzar and Chocolate Bars
combinatorics
,
fft
,
math
,
probabilities
3500
x123
1696H
Maximum Product?
brute force
,
combinatorics
,
dp
,
greedy
,
implementation
,
math
,
two pointers
3500
x153
1586I
Omkar and Mosaic
combinatorics
,
constructive algorithms
,
math
3500
x158
1893E
Cacti Symphony
combinatorics
,
dfs and similar
,
dp
,
graphs
3500
x179
1835E
Old Mobile
combinatorics
,
dp
,
probabilities
3500
x203
1687E
Become Big For Me
combinatorics
,
constructive algorithms
,
greedy
,
math
,
number theory
3500
x215
1336E2
Chiori and Doll Picking (hard version)
bitmasks
,
brute force
,
combinatorics
,
math
3500
x289
1292F
Nora's Toy Boxes
bitmasks
,
combinatorics
,
dp
3500
x304
1280F
Intergalactic Sliding Puzzle
combinatorics
,
constructive algorithms
,
math
3400
x58
1844H
Multiple of Three Cycles
combinatorics
,
data structures
,
dp
,
dsu
,
math
3400
x131
804F
Fake bullions
combinatorics
,
dfs and similar
,
dp
,
graphs
,
number theory
3400
x137
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
x195
848E
Days of Floral Colours
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
3400
x201
914H
Ember and Storm's Tree Game
combinatorics
,
dp
,
games
,
trees
3400
x230
794G
Replace All
combinatorics
,
dp
,
math
3400
x323
715E
Complete the Permutations
combinatorics
,
fft
,
graphs
,
math
3400
x344
1580F
Problems for Codeforces
combinatorics
,
fft
,
math
3300
x130
865G
Flowers and Chocolate
combinatorics
,
math
,
matrices
3300
x133
1450H2
Multithreading (Hard Version)
combinatorics
,
implementation
,
math
3300
x165
1641E
Special Positions
combinatorics
,
divide and conquer
,
fft
,
math
3300
x204
1188E
Problem from Red Panda
combinatorics
3300
x224
1750G
Doping
combinatorics
,
dp
,
math
3300
x225
1254E
Send Tree to Charlie
combinatorics
,
dfs and similar
,
dsu
,
trees
3300
x260
1466H
Finding satisfactory solutions
combinatorics
,
dp
,
graphs
,
greedy
,
math
3300
x262
1528F
AmShZ Farm
combinatorics
,
fft
,
math
3300
x275
1726G
A Certain Magical Party
combinatorics
,
data structures
,
greedy
,
sortings
3300
x283
878E
Numbers on the blackboard
combinatorics
,
dp
3300
x472
623E
Transforming Sequence
combinatorics
,
dp
,
fft
,
math
3300
x533
1403C
Chess Rush
*special problem
,
combinatorics
,
dp
,
implementation
,
math
3200
x42
756E
Byteland coins
combinatorics
,
dp
,
math
3200
x152
1704H1
Game of AI (easy version)
combinatorics
,
constructive algorithms
,
dp
,
fft
,
math
3200
x170
1470E
Strange Permutation
binary search
,
combinatorics
,
data structures
,
dp
,
graphs
,
implementation
,
two pointers
3200
x293
1774G
Segment Covering
brute force
,
combinatorics
,
constructive algorithms
,
data structures
,
dp
,
trees
3200
x368
1603E
A Perfect Problem
combinatorics
,
dp
,
math
3200
x403
750G
New Year and Binary Tree Paths
bitmasks
,
brute force
,
combinatorics
,
dp
3200
x441
1517F
Reunion
combinatorics
,
dp
,
trees
3200
x443
1608F
MEX counting
combinatorics
,
dp
,
implementation
3200
x520
755G
PolandBall and Many Other Balls
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
,
number theory
3200
x862
1967E1
Again Counting Arrays (Easy Version)
combinatorics
,
dp
,
fft
,
math
3100
x120
1954F
Unique Strings
combinatorics
,
dp
,
math
3100
x210
1864G
Magic Square
combinatorics
,
constructive algorithms
,
implementation
3100
x252
1951G
Clacking Balls
combinatorics
,
math
,
probabilities
3100
x256
981H
K Paths
combinatorics
,
data structures
,
dp
,
fft
,
math
3100
x265
1205E
Expected Value Again
combinatorics
,
strings
3100
x270
1784E
Infinite Game
brute force
,
combinatorics
,
dp
,
games
,
probabilities
3100
x303
1439D
INOI Final Contests
combinatorics
,
dp
,
fft
3100
x341
1924E
Paper Cutting Again
combinatorics
,
probabilities
3100
x394
653G
Move by Prime
combinatorics
,
math
,
number theory
3100
x516
1503E
2-Coloring
combinatorics
,
dp
,
math
3100
x594
1770F
Koxia and Sequence
bitmasks
,
combinatorics
,
dp
,
math
,
number theory
3100
x618
438E
The Child and Binary Tree
combinatorics
,
divide and conquer
,
fft
,
number theory
3100
x1795
372E
Drawing Circles is Fun
combinatorics
,
geometry
3000
x169
1743G
Antifibonacci Cut
bitmasks
,
combinatorics
,
constructive algorithms
,
data structures
,
dp
,
hashing
,
math
3000
x245
135E
Weak Subsequence
combinatorics
3000
x264
1299D
Around the World
bitmasks
,
combinatorics
,
dfs and similar
,
dp
,
graphs
,
graphs
,
math
,
trees
3000
x419
698F
Coprime Permutation
combinatorics
,
number theory
3000
x431
1707D
Partial Virtual Trees
combinatorics
,
dfs and similar
,
dp
,
math
,
trees
3000
x584
1667E
Centroid Probabilities
combinatorics
,
dp
,
fft
,
math
3000
x625
1097G
Vladislav and a Great Legend
combinatorics
,
dp
,
trees
3000
x669
1392H
ZS Shuffles Cards
combinatorics
,
dp
,
math
,
probabilities
3000
x675
506E
Mr. Kitayuta's Gift
combinatorics
,
dp
,
matrices
,
strings
3000
x685
1616H
Keep XOR Low
bitmasks
,
combinatorics
,
data structures
,
divide and conquer
,
dp
,
math
3000
x795
891E
Lust
combinatorics
,
math
,
matrices
3000
x862
1810H
Last Number
combinatorics
,
math
2900
x130
1928F
Digital Patterns
combinatorics
,
data structures
,
implementation
,
math
2900
x211
145D
Lucky Pair
combinatorics
,
data structures
,
implementation
2900
x238
217D
Bitonix' Patrol
bitmasks
,
brute force
,
combinatorics
,
dfs and similar
,
math
2900
x245
933D
A Creative Cutout
brute force
,
combinatorics
,
math
2900
x280
1605F
PalindORme
combinatorics
,
dp
2900
x291
1644F
Basis
combinatorics
,
fft
,
math
,
number theory
2900
x314
1847E
Triangle Platinum?
brute force
,
combinatorics
,
implementation
,
interactive
,
math
,
probabilities
2900
x317
776G
Sherlock and the Encrypted Data
bitmasks
,
combinatorics
,
dp
2900
x330
717A
Festival Organization
combinatorics
,
math
,
number theory
2900
x333
848D
Shake It!
combinatorics
,
dp
,
flows
,
graphs
2900
x365
917C
Pollywog
combinatorics
,
dp
,
matrices
2900
x373
1792F2
Graph Coloring (hard version)
brute force
,
combinatorics
,
divide and conquer
,
dp
,
fft
,
graphs
2900
x374
1450H1
Multithreading (Easy Version)
combinatorics
,
fft
,
math
2900
x375
1630E
Expected Components
combinatorics
,
math
,
number theory
,
probabilities
2900
x423
997D
Cycles in product
combinatorics
,
divide and conquer
,
trees
2900
x424
1747E
List Generation
combinatorics
,
dp
,
math
2900
x485
1528E
Mashtali and Hagh Trees
combinatorics
,
dp
,
trees
2900
x505
1085G
Beautiful Matrix
combinatorics
,
data structures
,
dp
2900
x506
1713F
Lost Array
bitmasks
,
combinatorics
,
constructive algorithms
,
dp
,
math
2900
x510
896D
Nephren Runs a Cinema
chinese remainder theorem
,
combinatorics
,
math
,
number theory
2900
x517
1221G
Graph And Numbers
bitmasks
,
brute force
,
combinatorics
,
dp
,
meet-in-the-middle
2900
x520
1060F
Shrinking Tree
combinatorics
,
dp
2900
x544
722E
Research Rover
combinatorics
,
dp
2900
x799
1264D2
Beautiful Bracket Sequence (hard version)
combinatorics
,
probabilities
2900
x847
960G
Bandit Blues
combinatorics
,
dp
,
fft
,
math
2900
x1033
585E
Present for Vitalik the Philatelist
combinatorics
,
math
,
number theory
2900
x1044
1285F
Classical?
binary search
,
combinatorics
,
number theory
2900
x1065
1488H
Build From Suffixes
*special problem
,
combinatorics
,
data structures
2800
x54
1725I
Imitating the Key Tree
combinatorics
,
dsu
,
trees
2800
x187
1773G
Game of Questions
bitmasks
,
combinatorics
,
dp
,
fft
,
math
,
probabilities
2800
x321
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