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Codeforces Round 940 (Div. 2) and CodeCraft-23
3 days
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brute force
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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Problems
#
Name
1491I
Ruler Of The Zoo
brute force
,
data structures
3500
x72
1896H2
Cyclic Hamming (Hard Version)
brute force
,
dp
,
fft
,
math
,
number theory
3500
x83
1545F
AquaMoon and Potatoes
brute force
,
data structures
,
dp
3500
x101
1854F
Mark and Spaceship
brute force
,
dp
3500
x107
1876G
Clubstep
binary search
,
brute force
,
data structures
,
greedy
,
trees
3500
x114
1508F
Optimal Encoding
brute force
,
data structures
3500
x115
1779H
Olympic Team Building
brute force
,
meet-in-the-middle
3500
x129
1444E
Finding the Vertex
brute force
,
dfs and similar
,
dp
,
interactive
,
trees
3500
x129
1696H
Maximum Product?
brute force
,
combinatorics
,
dp
,
greedy
,
implementation
,
math
,
two pointers
3500
x141
1320F
Blocks and Sensors
brute force
3500
x148
1753F
Minecraft Series
brute force
,
two pointers
3500
x184
1515H
Phoenix and Bits
bitmasks
,
brute force
,
data structures
,
sortings
3500
x204
1336E2
Chiori and Doll Picking (hard version)
bitmasks
,
brute force
,
combinatorics
,
math
3500
x280
1305G
Kuroni and Antihype
bitmasks
,
brute force
,
dp
,
dsu
,
graphs
3500
x935
1580E
Railway Construction
brute force
,
constructive algorithms
,
data structures
,
graphs
,
shortest paths
3400
x63
1896H1
Cyclic Hamming (Easy Version)
brute force
,
divide and conquer
,
dp
,
fft
,
math
,
number theory
3400
x76
1097H
Mateusz and an Infinite Sequence
bitmasks
,
brute force
,
dp
,
strings
3400
x91
1817E
Half-sum
brute force
,
divide and conquer
,
greedy
3400
x246
865F
Egg Roulette
bitmasks
,
brute force
,
divide and conquer
,
math
,
meet-in-the-middle
3300
x66
865E
Hex Dyslexia
bitmasks
,
brute force
,
dp
,
graphs
3300
x117
1017H
The Films
brute force
3300
x136
1548D2
Gregor and the Odd Cows (Hard)
brute force
,
geometry
,
math
,
number theory
3300
x236
1696G
Fishingprince Plays With Array Again
brute force
,
data structures
,
geometry
,
math
3300
x263
1753E
N Machines
binary search
,
brute force
,
greedy
3300
x305
1340F
Nastya and CBS
brute force
,
data structures
,
hashing
3300
x467
765G
Math, math everywhere
brute force
,
dp
,
math
,
meet-in-the-middle
,
number theory
3200
x79
1638F
Two Posters
brute force
,
data structures
,
greedy
,
two pointers
3200
x185
1210F2
Marek and Matching (hard version)
brute force
,
probabilities
3200
x187
1540D
Inverse Inversions
binary search
,
brute force
,
data structures
3200
x259
1774G
Segment Covering
brute force
,
combinatorics
,
constructive algorithms
,
data structures
,
dp
,
trees
3200
x357
1519F
Chests and Keys
bitmasks
,
brute force
,
dfs and similar
,
dp
,
flows
3200
x380
1495E
Qingshan and Daniel
brute force
,
data structures
,
greedy
,
implementation
3200
x394
750G
New Year and Binary Tree Paths
bitmasks
,
brute force
,
combinatorics
,
dp
3200
x438
1268D
Invertation in Tournament
brute force
,
divide and conquer
,
graphs
,
math
3200
x479
1250I
Show Must Go On
binary search
,
brute force
,
greedy
,
shortest paths
3100
x126
662E
To Hack or not to Hack
brute force
,
dp
,
greedy
3100
x129
1167G
Low Budget Inception
brute force
,
geometry
3100
x145
1210F1
Marek and Matching (easy version)
brute force
,
probabilities
3100
x186
1578J
Just Kingdom
brute force
,
data structures
,
dfs and similar
3100
x216
164D
Minimum Diameter
binary search
,
brute force
3100
x228
1286F
Harry The Potter
brute force
,
constructive algorithms
,
dp
,
fft
,
implementation
,
math
3100
x230
1784E
Infinite Game
brute force
,
combinatorics
,
dp
,
games
,
probabilities
3100
x297
1508E
Tree Calendar
brute force
,
constructive algorithms
,
data structures
,
dfs and similar
,
sortings
,
trees
3100
x323
1948G
MST with Matching
bitmasks
,
brute force
,
dsu
,
graph matchings
,
trees
3100
x558
156E
Mrs. Hudson's Pancakes
brute force
,
dp
3000
x159
1934E
Weird LCM Operations
brute force
,
constructive algorithms
,
number theory
3000
x163
280E
Sequence Transformation
brute force
,
data structures
,
dp
,
implementation
,
math
3000
x195
1569F
Palindromic Hamiltonian Path
brute force
,
dfs and similar
,
dp
,
graphs
,
hashing
3000
x225
1181E2
A Story of One Country (Hard)
brute force
,
greedy
,
sortings
3000
x257
666D
Chain Reaction
brute force
,
geometry
3000
x257
436F
Banners
brute force
,
data structures
,
dp
3000
x355
1651F
Tower Defense
binary search
,
brute force
,
data structures
3000
x360
1854E
Game Bundles
brute force
,
constructive algorithms
,
dp
,
greedy
,
math
3000
x373
1787G
Colorful Tree Again
brute force
,
data structures
,
trees
3000
x391
1535F
String Distance
binary search
,
brute force
,
data structures
,
hashing
,
implementation
,
strings
3000
x429
1552G
A Serious Referee
bitmasks
,
brute force
,
dfs and similar
,
sortings
3000
x445
1889D
Game of Stacks
brute force
,
dfs and similar
,
graphs
,
implementation
,
trees
3000
x505
1149D
Abandoning Roads
brute force
,
dp
,
graphs
,
greedy
3000
x660
1342F
Make It Ascending
bitmasks
,
brute force
,
dp
3000
x663
914F
Substrings in a String
bitmasks
,
brute force
,
data structures
,
string suffix structures
,
strings
3000
x1413
739E
Gosha is hunting
brute force
,
data structures
,
dp
,
flows
,
math
,
probabilities
,
sortings
3000
x2040
73F
Plane of Tanks
brute force
,
geometry
2900
x73
126E
Pills
brute force
,
flows
2900
x81
138E
Hellish Constraints
brute force
,
dp
,
two pointers
2900
x162
1796F
Strange Triples
brute force
,
math
,
number theory
2900
x165
478E
Wavy numbers
brute force
,
dfs and similar
,
meet-in-the-middle
,
sortings
2900
x203
497D
Gears
brute force
,
geometry
,
math
2900
x222
1056G
Take Metro
brute force
,
data structures
,
graphs
2900
x237
217D
Bitonix' Patrol
bitmasks
,
brute force
,
combinatorics
,
dfs and similar
,
math
2900
x241
933D
A Creative Cutout
brute force
,
combinatorics
,
math
2900
x278
679D
Bear and Chase
brute force
,
dfs and similar
,
graphs
,
implementation
,
math
,
probabilities
2900
x310
1847E
Triangle Platinum?
brute force
,
combinatorics
,
implementation
,
interactive
,
math
,
probabilities
2900
x311
1943E1
MEX Game 2 (Easy Version)
binary search
,
brute force
,
greedy
2900
x314
193E
Fibonacci Number
brute force
,
math
,
matrices
2900
x319
1494F
Delete The Edges
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
implementation
2900
x324
1359F
RC Kaboom Show
binary search
,
brute force
,
data structures
,
geometry
,
math
2900
x347
1334G
Substring Search
bitmasks
,
brute force
,
fft
2900
x352
1792F2
Graph Coloring (hard version)
brute force
,
combinatorics
,
divide and conquer
,
dp
,
fft
,
graphs
2900
x370
163D
Large Refrigerator
brute force
2900
x478
1028F
Make Symmetrical
brute force
2900
x509
1221G
Graph And Numbers
bitmasks
,
brute force
,
combinatorics
,
dp
,
meet-in-the-middle
2900
x517
1687D
Cute number
binary search
,
brute force
,
data structures
,
dsu
,
implementation
,
math
2900
x554
1616F
Tricolor Triangles
brute force
,
graphs
,
math
,
matrices
2900
x580
343E
Pumping Stations
brute force
,
dfs and similar
,
divide and conquer
,
flows
,
graphs
,
greedy
,
trees
2900
x668
1580D
Subsequence
brute force
,
divide and conquer
,
dp
,
greedy
,
trees
2900
x750
1479D
Odd Mineral Resource
binary search
,
bitmasks
,
brute force
,
data structures
,
probabilities
,
trees
2900
x943
364D
Ghd
brute force
,
math
,
probabilities
2900
x1948
869D
The Overdosing Ubiquity
brute force
,
dfs and similar
,
graphs
2800
x234
1031F
Familiar Operations
brute force
,
graphs
,
math
2800
x263
568D
Sign Posts
brute force
,
geometry
,
math
2800
x297
1923F
Shrink-Reverse
binary search
,
brute force
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
2800
x312
1525F
Goblins And Gnomes
brute force
,
dp
,
flows
,
graph matchings
2800
x315
1578K
Kingdom of Islands
brute force
,
graphs
,
implementation
2800
x346
1721F
Matching Reduction
brute force
,
constructive algorithms
,
dfs and similar
,
flows
,
graph matchings
,
graphs
,
interactive
2800
x357
1033F
Boolean Computer
bitmasks
,
brute force
,
fft
,
math
2800
x363
850E
Random Elections
bitmasks
,
brute force
,
divide and conquer
,
fft
,
math
2800
x377
1155F
Delivery Oligopoly
brute force
,
dp
,
graphs
2800
x397
261E
Maxim and Calculator
brute force
,
dp
,
two pointers
2800
x402
1808E3
Minibuses on Venus (hard version)
brute force
,
combinatorics
,
dp
,
math
2800
x410
1879F
Last Man Standing
brute force
,
data structures
,
number theory
2800
x465
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