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Before contest
Codeforces Round (Div. 2)
3 days
→ Filter Problems
Difficulty:
—
greedy
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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Custom test
Problems
#
Name
1827F
Copium Permutation
constructive algorithms
,
data structures
,
greedy
3500
x55
1349E
Slime and Hats
constructive algorithms
,
dp
,
greedy
3500
x70
1305H
Kuroni the Private Tutor
binary search
,
greedy
3500
x78
1237G
Balanced Distribution
data structures
,
dp
,
greedy
3500
x81
1685D2
Permutation Weight (Hard Version)
constructive algorithms
,
greedy
3500
x83
1696H
Maximum Product?
brute force
,
combinatorics
,
dp
,
greedy
,
implementation
,
math
,
two pointers
3500
x96
1685E
The Ultimate LIS Problem
data structures
,
greedy
3500
x105
1456E
XOR-ranges
dp
,
greedy
3500
x149
1687E
Become Big For Me
combinatorics
,
constructive algorithms
,
greedy
,
math
,
number theory
3500
x178
1637H
Minimize Inversions Number
data structures
,
greedy
,
math
,
sortings
3500
x227
1292E
Rin and The Unknown Flower
constructive algorithms
,
greedy
,
interactive
,
math
3500
x264
1817E
Half-sum
brute force
,
divide and conquer
,
greedy
3400
x149
1548E
Gregor and the Two Painters
data structures
,
divide and conquer
,
graphs
,
greedy
,
math
3400
x165
1827E
Bus Routes
binary search
,
constructive algorithms
,
dfs and similar
,
greedy
,
trees
3400
x167
1693F
I Might Be Wrong
binary search
,
greedy
,
two pointers
3400
x217
1693E
Outermost Maximums
data structures
,
greedy
3400
x261
1097E
Egor and an RPG game
constructive algorithms
,
greedy
3400
x405
737E
Tanya is 5!
graph matchings
,
graphs
,
greedy
,
schedules
3300
x103
1477E
Nezzar and Tournaments
data structures
,
greedy
3300
x105
1209H
Moving Walkways
data structures
,
greedy
,
math
3300
x122
1329E
Dreamoon Loves AA
binary search
,
greedy
3300
x137
1466H
Finding satisfactory solutions
combinatorics
,
dp
,
graphs
,
greedy
,
math
3300
x180
1610G
AmShZ Wins a Bet
data structures
,
greedy
,
hashing
3300
x181
1726G
A Certain Magical Party
combinatorics
,
data structures
,
greedy
,
sortings
3300
x191
1718D
Permutation for Burenka
data structures
,
graph matchings
,
greedy
,
math
,
trees
3300
x201
1416F
Showing Off
flows
,
graph matchings
,
greedy
,
implementation
3300
x209
1054G
New Road Network
constructive algorithms
,
greedy
,
math
3300
x218
1368H1
Breadboard Capacity (easy version)
dp
,
flows
,
greedy
3300
x227
1408H
Rainbow Triples
binary search
,
data structures
,
flows
,
greedy
3300
x242
1753E
N Machines
binary search
,
brute force
,
greedy
3300
x253
1556H
DIY Tree
graphs
,
greedy
,
math
,
probabilities
3300
x261
671E
Organizing a Race
data structures
,
greedy
3300
x279
526G
Spiders Evil Plan
greedy
,
trees
3300
x562
457F
An easy problem about trees
dp
,
games
,
greedy
,
trees
3200
x67
1089J
JS Minification
greedy
,
implementation
3200
x108
1638F
Two Posters
brute force
,
data structures
,
greedy
,
two pointers
3200
x163
1416E
Split
binary search
,
data structures
,
dp
,
greedy
3200
x202
1427F
Boring Card Game
data structures
,
greedy
,
trees
3200
x207
1495E
Qingshan and Daniel
brute force
,
data structures
,
greedy
,
implementation
3200
x312
650E
Clockwork Bomb
data structures
,
dfs and similar
,
dsu
,
greedy
,
trees
3200
x471
538H
Summer Dichotomy
2-sat
,
data structures
,
dfs and similar
,
greedy
3200
x503
573E
Bear and Bowling
data structures
,
greedy
3200
x866
662E
To Hack or not to Hack
brute force
,
dp
,
greedy
3100
x118
1250I
Show Must Go On
binary search
,
brute force
,
greedy
,
shortest paths
3100
x123
1190E
Tokitsukaze and Explosion
binary search
,
greedy
3100
x198
1120F
Secret Letters
data structures
,
dp
,
greedy
3100
x209
1805F2
Survival of the Weakest (hard version)
greedy
,
math
,
sortings
,
two pointers
3100
x215
1610H
Squid Game
data structures
,
dfs and similar
,
greedy
,
trees
3100
x227
1566G
Four Vertices
constructive algorithms
,
data structures
,
graphs
,
greedy
,
implementation
,
shortest paths
3100
x273
1067D
Computer Game
dp
,
greedy
,
math
,
probabilities
3100
x281
1728F
Fishermen
flows
,
graph matchings
,
greedy
3100
x300
1647F
Madoka and Laziness
dp
,
greedy
3100
x323
1481F
AB Tree
dp
,
greedy
,
trees
3100
x329
1225G
To Make 1
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
number theory
3100
x393
700D
Huffman Coding on Segment
data structures
,
greedy
3100
x400
626G
Raffles
data structures
,
dp
,
greedy
,
math
3100
x427
704D
Captain America
flows
,
greedy
3100
x614
1458D
Flip and Reverse
data structures
,
graphs
,
greedy
3100
x674
856F
To Play or not to Play
greedy
3000
x72
1672I
PermutationForces
data structures
,
greedy
3000
x112
167D
Wizards and Roads
data structures
,
divide and conquer
,
graph matchings
,
graphs
,
greedy
3000
x173
1181E2
A Story of One Country (Hard)
brute force
,
greedy
,
sortings
3000
x214
1776M
Parmigiana With Seafood
binary search
,
dp
,
greedy
,
trees
3000
x221
936D
World of Tank
dp
,
greedy
3000
x246
1411F
The Thorny Path
greedy
,
math
3000
x263
533A
Berland Miners
binary search
,
data structures
,
dfs and similar
,
greedy
,
trees
3000
x292
1609G
A Stroll Around the Matrix
data structures
,
greedy
,
math
3000
x317
1558E
Down Below
binary search
,
dfs and similar
,
graphs
,
greedy
,
meet-in-the-middle
,
shortest paths
3000
x360
335F
Buy One, Get One Free
dp
,
greedy
3000
x375
1381D
The Majestic Brown Tree Snake
dfs and similar
,
dp
,
greedy
,
trees
,
two pointers
3000
x377
771E
Bear and Rectangle Strips
dp
,
greedy
3000
x378
1637G
Birthday
constructive algorithms
,
greedy
,
math
3000
x381
341E
Candies Game
constructive algorithms
,
greedy
3000
x385
1534F2
Falling Sand (Hard Version)
dfs and similar
,
dp
,
graphs
,
greedy
3000
x413
1442E
Black, White and Grey Tree
binary search
,
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
3000
x434
1428G2
Lucky Numbers (Hard Version)
dp
,
greedy
3000
x500
1149D
Abandoning Roads
brute force
,
dp
,
graphs
,
greedy
3000
x508
1446D2
Frequency Problem (Hard Version)
data structures
,
greedy
,
two pointers
3000
x875
89E
Fire and Ice
greedy
2900
x75
187E
Heaven Tour
data structures
,
greedy
2900
x83
183E
Candy Shop
greedy
2900
x112
871E
Restore the Tree
graphs
,
greedy
,
trees
2900
x114
1726F
Late For Work (submissions are not allowed)
data structures
,
greedy
,
schedules
,
shortest paths
2900
x131
309E
Sheep
binary search
,
greedy
2900
x143
736E
Chess Championship
constructive algorithms
,
flows
,
greedy
,
math
2900
x163
1806F2
GCD Master (hard version)
greedy
,
math
,
sortings
2900
x176
1806F1
GCD Master (easy version)
greedy
,
math
,
number theory
,
sortings
2900
x218
1452F
Divide Powers
constructive algorithms
,
greedy
2900
x260
1051G
Distinctification
data structures
,
dsu
,
greedy
2900
x290
1361D
Johnny and James
greedy
,
implementation
,
math
,
trees
2900
x293
1654G
Snowy Mountain
data structures
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
,
trees
2900
x300
1738G
Anti-Increasing Addicts
constructive algorithms
,
dp
,
greedy
,
math
2900
x304
1487F
Ones
dp
,
greedy
,
shortest paths
2900
x328
1646F
Playing Around the Table
constructive algorithms
,
greedy
,
implementation
2900
x339
1601E
Phys Ed Online
data structures
,
dp
,
greedy
2900
x376
725F
Family Photos
games
,
greedy
2900
x380
321D
Ciel and Flipboard
dp
,
greedy
,
math
2900
x394
1428G1
Lucky Numbers (Easy Version)
dp
,
greedy
2900
x470
1768F
Wonderful Jump
dp
,
greedy
2900
x551
343E
Pumping Stations
brute force
,
dfs and similar
,
divide and conquer
,
flows
,
graphs
,
greedy
,
trees
2900
x560
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