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Before contest
Codeforces Round 941 (Div. 1)
23:15:54
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Before contest
Codeforces Round 941 (Div. 2)
23:15:54
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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
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strings
ternary search
trees
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Problems
#
Name
1491I
Ruler Of The Zoo
brute force
,
data structures
3500
x73
1896H2
Cyclic Hamming (Hard Version)
brute force
,
dp
,
fft
,
math
,
number theory
3500
x85
1545F
AquaMoon and Potatoes
brute force
,
data structures
,
dp
3500
x102
1854F
Mark and Spaceship
brute force
,
dp
3500
x110
1876G
Clubstep
binary search
,
brute force
,
data structures
,
greedy
,
trees
3500
x116
1508F
Optimal Encoding
brute force
,
data structures
3500
x116
1779H
Olympic Team Building
brute force
,
meet-in-the-middle
3500
x130
1444E
Finding the Vertex
brute force
,
dfs and similar
,
dp
,
interactive
,
trees
3500
x130
1320F
Blocks and Sensors
brute force
3500
x149
1696H
Maximum Product?
brute force
,
combinatorics
,
dp
,
greedy
,
implementation
,
math
,
two pointers
3500
x152
1753F
Minecraft Series
brute force
,
two pointers
3500
x185
1515H
Phoenix and Bits
bitmasks
,
brute force
,
data structures
,
sortings
3500
x211
1336E2
Chiori and Doll Picking (hard version)
bitmasks
,
brute force
,
combinatorics
,
math
3500
x285
1305G
Kuroni and Antihype
bitmasks
,
brute force
,
dp
,
dsu
,
graphs
3500
x938
1580E
Railway Construction
brute force
,
constructive algorithms
,
data structures
,
graphs
,
shortest paths
3400
x64
1896H1
Cyclic Hamming (Easy Version)
brute force
,
divide and conquer
,
dp
,
fft
,
math
,
number theory
3400
x77
1097H
Mateusz and an Infinite Sequence
bitmasks
,
brute force
,
dp
,
strings
3400
x92
1817E
Half-sum
brute force
,
divide and conquer
,
greedy
3400
x249
865F
Egg Roulette
bitmasks
,
brute force
,
divide and conquer
,
math
,
meet-in-the-middle
3300
x67
865E
Hex Dyslexia
bitmasks
,
brute force
,
dp
,
graphs
3300
x118
1017H
The Films
brute force
3300
x137
1548D2
Gregor and the Odd Cows (Hard)
brute force
,
geometry
,
math
,
number theory
3300
x237
1696G
Fishingprince Plays With Array Again
brute force
,
data structures
,
geometry
,
math
3300
x265
1753E
N Machines
binary search
,
brute force
,
greedy
3300
x307
1340F
Nastya and CBS
brute force
,
data structures
,
hashing
3300
x469
765G
Math, math everywhere
brute force
,
dp
,
math
,
meet-in-the-middle
,
number theory
3200
x79
1210F2
Marek and Matching (hard version)
brute force
,
probabilities
3200
x188
1638F
Two Posters
brute force
,
data structures
,
greedy
,
two pointers
3200
x189
1540D
Inverse Inversions
binary search
,
brute force
,
data structures
3200
x262
1774G
Segment Covering
brute force
,
combinatorics
,
constructive algorithms
,
data structures
,
dp
,
trees
3200
x363
1519F
Chests and Keys
bitmasks
,
brute force
,
dfs and similar
,
dp
,
flows
3200
x386
1495E
Qingshan and Daniel
brute force
,
data structures
,
greedy
,
implementation
3200
x396
750G
New Year and Binary Tree Paths
bitmasks
,
brute force
,
combinatorics
,
dp
3200
x439
1268D
Invertation in Tournament
brute force
,
divide and conquer
,
graphs
,
math
3200
x480
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
x132
1167G
Low Budget Inception
brute force
,
geometry
3100
x146
1210F1
Marek and Matching (easy version)
brute force
,
probabilities
3100
x187
1578J
Just Kingdom
brute force
,
data structures
,
dfs and similar
3100
x217
164D
Minimum Diameter
binary search
,
brute force
3100
x229
1286F
Harry The Potter
brute force
,
constructive algorithms
,
dp
,
fft
,
implementation
,
math
3100
x233
1784E
Infinite Game
brute force
,
combinatorics
,
dp
,
games
,
probabilities
3100
x300
1508E
Tree Calendar
brute force
,
constructive algorithms
,
data structures
,
dfs and similar
,
sortings
,
trees
3100
x326
1948G
MST with Matching
bitmasks
,
brute force
,
dsu
,
graph matchings
,
trees
3100
x579
156E
Mrs. Hudson's Pancakes
brute force
,
dp
3000
x160
1934E
Weird LCM Operations
brute force
,
constructive algorithms
,
number theory
3000
x171
280E
Sequence Transformation
brute force
,
data structures
,
dp
,
implementation
,
math
3000
x196
1569F
Palindromic Hamiltonian Path
brute force
,
dfs and similar
,
dp
,
graphs
,
hashing
3000
x226
1181E2
A Story of One Country (Hard)
brute force
,
greedy
,
sortings
3000
x258
666D
Chain Reaction
brute force
,
geometry
3000
x258
436F
Banners
brute force
,
data structures
,
dp
3000
x358
1651F
Tower Defense
binary search
,
brute force
,
data structures
3000
x362
1854E
Game Bundles
brute force
,
constructive algorithms
,
dp
,
greedy
,
math
3000
x379
1787G
Colorful Tree Again
brute force
,
data structures
,
trees
3000
x394
1535F
String Distance
binary search
,
brute force
,
data structures
,
hashing
,
implementation
,
strings
3000
x437
1552G
A Serious Referee
bitmasks
,
brute force
,
dfs and similar
,
sortings
3000
x446
1889D
Game of Stacks
brute force
,
dfs and similar
,
graphs
,
implementation
,
trees
3000
x510
1149D
Abandoning Roads
brute force
,
dp
,
graphs
,
greedy
3000
x664
1342F
Make It Ascending
bitmasks
,
brute force
,
dp
3000
x665
914F
Substrings in a String
bitmasks
,
brute force
,
data structures
,
string suffix structures
,
strings
3000
x1418
739E
Gosha is hunting
brute force
,
data structures
,
dp
,
flows
,
math
,
probabilities
,
sortings
3000
x2044
73F
Plane of Tanks
brute force
,
geometry
2900
x74
126E
Pills
brute force
,
flows
2900
x82
138E
Hellish Constraints
brute force
,
dp
,
two pointers
2900
x164
1796F
Strange Triples
brute force
,
math
,
number theory
2900
x167
478E
Wavy numbers
brute force
,
dfs and similar
,
meet-in-the-middle
,
sortings
2900
x204
497D
Gears
brute force
,
geometry
,
math
2900
x224
1056G
Take Metro
brute force
,
data structures
,
graphs
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
679D
Bear and Chase
brute force
,
dfs and similar
,
graphs
,
implementation
,
math
,
probabilities
2900
x311
1847E
Triangle Platinum?
brute force
,
combinatorics
,
implementation
,
interactive
,
math
,
probabilities
2900
x313
193E
Fibonacci Number
brute force
,
math
,
matrices
2900
x320
1494F
Delete The Edges
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
implementation
2900
x326
1943E1
MEX Game 2 (Easy Version)
binary search
,
brute force
,
greedy
2900
x330
1359F
RC Kaboom Show
binary search
,
brute force
,
data structures
,
geometry
,
math
2900
x349
1334G
Substring Search
bitmasks
,
brute force
,
fft
2900
x353
1792F2
Graph Coloring (hard version)
brute force
,
combinatorics
,
divide and conquer
,
dp
,
fft
,
graphs
2900
x372
163D
Large Refrigerator
brute force
2900
x480
1028F
Make Symmetrical
brute force
2900
x510
1221G
Graph And Numbers
bitmasks
,
brute force
,
combinatorics
,
dp
,
meet-in-the-middle
2900
x518
1687D
Cute number
binary search
,
brute force
,
data structures
,
dsu
,
implementation
,
math
2900
x556
1616F
Tricolor Triangles
brute force
,
graphs
,
math
,
matrices
2900
x582
343E
Pumping Stations
brute force
,
dfs and similar
,
divide and conquer
,
flows
,
graphs
,
greedy
,
trees
2900
x670
1580D
Subsequence
brute force
,
divide and conquer
,
dp
,
greedy
,
trees
2900
x756
1479D
Odd Mineral Resource
binary search
,
bitmasks
,
brute force
,
data structures
,
probabilities
,
trees
2900
x953
364D
Ghd
brute force
,
math
,
probabilities
2900
x1950
869D
The Overdosing Ubiquity
brute force
,
dfs and similar
,
graphs
2800
x235
1031F
Familiar Operations
brute force
,
graphs
,
math
2800
x264
568D
Sign Posts
brute force
,
geometry
,
math
2800
x298
1525F
Goblins And Gnomes
brute force
,
dp
,
flows
,
graph matchings
2800
x316
1923F
Shrink-Reverse
binary search
,
brute force
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
2800
x319
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
x359
1033F
Boolean Computer
bitmasks
,
brute force
,
fft
,
math
2800
x364
850E
Random Elections
bitmasks
,
brute force
,
divide and conquer
,
fft
,
math
2800
x378
1155F
Delivery Oligopoly
brute force
,
dp
,
graphs
2800
x398
261E
Maxim and Calculator
brute force
,
dp
,
two pointers
2800
x403
1808E3
Minibuses on Venus (hard version)
brute force
,
combinatorics
,
dp
,
math
2800
x414
1879F
Last Man Standing
brute force
,
data structures
,
number theory
2800
x470
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