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Before contest
Codeforces Round (Div. 2)
5 days
→ Filter Problems
Difficulty:
—
trees
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
1326G
Spiderweb Trees
dp
,
geometry
,
trees
3500
x57
1322F
Assigning Fares
dp
,
trees
3500
x76
1824E
LuoTianyi and Cartridge
data structures
,
trees
3500
x78
1761G
Centroid Guess
interactive
,
probabilities
,
trees
3500
x82
1423C
Dušan's Railway
divide and conquer
,
graphs
,
trees
3500
x95
1621H
Trains and Airplanes
dfs and similar
,
graphs
,
shortest paths
,
trees
3500
x100
1444E
Finding the Vertex
brute force
,
dfs and similar
,
dp
,
interactive
,
trees
3500
x103
1208H
Red Blue Tree
data structures
,
implementation
,
trees
3500
x113
1608G
Alphabetic Tree
binary search
,
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
3500
x114
1534H
Lost Nodes
constructive algorithms
,
dp
,
graphs
,
interactive
,
sortings
,
trees
3500
x131
1336F
Journey
data structures
,
divide and conquer
,
graphs
,
trees
3500
x149
1053E
Euler tour
constructive algorithms
,
trees
3500
x162
1439E
Cheat and Win
bitmasks
,
data structures
,
games
,
trees
3500
x166
1458F
Range Diameter Sum
data structures
,
trees
3500
x172
1450G
Communism
bitmasks
,
dp
,
trees
3500
x181
1464F
My Beautiful Madness
data structures
,
trees
3500
x212
1023G
Pisces
data structures
,
flows
,
trees
3400
x86
917E
Upside Down
data structures
,
string suffix structures
,
strings
,
trees
3400
x100
786D
Rap God
data structures
,
dfs and similar
,
hashing
,
strings
,
trees
3400
x106
1158E
Strange device
binary search
,
interactive
,
math
,
trees
3400
x131
1827E
Bus Routes
binary search
,
constructive algorithms
,
dfs and similar
,
greedy
,
trees
3400
x156
936E
Iqea
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
shortest paths
,
trees
3400
x163
914H
Ember and Storm's Tree Game
combinatorics
,
dp
,
games
,
trees
3400
x183
1010F
Tree
fft
,
graphs
,
trees
3400
x185
627F
Island Puzzle
dfs and similar
,
dsu
,
graphs
,
trees
3400
x194
1482H
Exam
data structures
,
string suffix structures
,
trees
3400
x277
1710D
Recover the Tree
constructive algorithms
,
trees
3400
x346
757G
Can Bash Save the Day?
data structures
,
divide and conquer
,
graphs
,
trees
3400
x351
1137F
Matches Are Not a Child's Play
data structures
,
trees
3400
x356
1119F
Niyaz and Small Degrees
data structures
,
dp
,
trees
3400
x525
1491H
Yuezheng Ling and Dynamic Tree
data structures
,
trees
3400
x526
1740H
MEX Tree Manipulation
data structures
,
trees
3300
x135
855G
Harry Vs Voldemort
dfs and similar
,
dp
,
graphs
,
trees
3300
x171
1495F
Squares
constructive algorithms
,
data structures
,
dp
,
graphs
,
trees
3300
x199
1718D
Permutation for Burenka
data structures
,
graph matchings
,
greedy
,
math
,
trees
3300
x201
1254E
Send Tree to Charlie
combinatorics
,
dfs and similar
,
dsu
,
trees
3300
x224
704E
Iron Man
data structures
,
geometry
,
trees
3300
x225
1583H
Omkar and Tours
data structures
,
divide and conquer
,
sortings
,
trees
3300
x261
639F
Bear and Chemistry
data structures
,
dfs and similar
,
graphs
,
trees
3300
x338
1307F
Cow and Vacation
dfs and similar
,
dsu
,
trees
3300
x407
526G
Spiders Evil Plan
greedy
,
trees
3300
x562
690F3
Tree of Life (hard)
trees
3200
x39
923F
Public Service
constructive algorithms
,
graphs
,
trees
3200
x63
457F
An easy problem about trees
dp
,
games
,
greedy
,
trees
3200
x67
500G
New Year Running
number theory
,
trees
3200
x100
772E
Verifying Kingdom
binary search
,
divide and conquer
,
interactive
,
trees
3200
x109
1819E
Roads in E City
interactive
,
math
,
probabilities
,
trees
3200
x155
482E
ELCA
data structures
,
trees
3200
x166
1781G
Diverse Coloring
constructive algorithms
,
trees
3200
x173
1427F
Boring Card Game
data structures
,
greedy
,
trees
3200
x207
1007D
Ants
2-sat
,
data structures
,
trees
3200
x215
1712F
Triameter
binary search
,
data structures
,
dfs and similar
,
trees
3200
x220
1109F
Sasha and Algorithm of Silence's Sounds
data structures
,
trees
3200
x223
1774G
Segment Covering
brute force
,
combinatorics
,
constructive algorithms
,
data structures
,
dp
,
trees
3200
x230
1396E
Distance Matching
constructive algorithms
,
dfs and similar
,
trees
3200
x270
1284F
New Year and Social Network
data structures
,
graph matchings
,
graphs
,
math
,
trees
3200
x272
1368G
Shifting Dominoes
data structures
,
geometry
,
graphs
,
trees
3200
x280
1019E
Raining season
data structures
,
divide and conquer
,
trees
3200
x280
1648E
Air Reform
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
implementation
,
trees
3200
x288
1517F
Reunion
combinatorics
,
dp
,
trees
3200
x317
840E
In a Trap
trees
3200
x344
578F
Mirror Box
matrices
,
trees
3200
x401
566E
Restoring Map
bitmasks
,
constructive algorithms
,
trees
3200
x457
650E
Clockwork Bomb
data structures
,
dfs and similar
,
dsu
,
greedy
,
trees
3200
x471
786E
ALT
data structures
,
flows
,
graphs
,
trees
3200
x488
487E
Tourists
data structures
,
dfs and similar
,
graphs
,
trees
3200
x1456
1211H
Road Repair in Treeland
*special problem
,
binary search
,
dp
,
trees
3100
x34
1767F
Two Subtrees
data structures
,
trees
3100
x114
891D
Sloth
dfs and similar
,
dp
,
graph matchings
,
trees
3100
x150
830E
Perpetual Motion Machine
constructive algorithms
,
dp
,
graphs
,
implementation
,
math
,
trees
3100
x192
960H
Santa's Gift
data structures
,
trees
3100
x197
1344E
Train Tracks
data structures
,
trees
3100
x199
1610I
Mashtali vs AtCoder
games
,
trees
3100
x225
1610H
Squid Game
data structures
,
dfs and similar
,
greedy
,
trees
3100
x227
1508E
Tree Calendar
brute force
,
constructive algorithms
,
data structures
,
dfs and similar
,
sortings
,
trees
3100
x294
536E
Tavas on the Path
data structures
,
divide and conquer
,
trees
3100
x300
1481F
AB Tree
dp
,
greedy
,
trees
3100
x329
1129E
Legendary Tree
binary search
,
interactive
,
trees
3100
x336
1383C
String Transformation 2
bitmasks
,
dp
,
graphs
,
trees
3100
x406
1110G
Tree-Tac-Toe
constructive algorithms
,
games
,
trees
3100
x481
571D
Campus
binary search
,
data structures
,
dsu
,
trees
3100
x554
1628E
Groceries in Meteor Town
binary search
,
data structures
,
dsu
,
trees
3100
x562
809E
Surprise me!
divide and conquer
,
math
,
number theory
,
trees
3100
x599
176E
Archaeology
data structures
,
dfs and similar
,
trees
3100
x747
251E
Tree and Table
dfs and similar
,
dp
,
implementation
,
trees
3000
x99
331D3
Escaping on Beaveractor
data structures
,
implementation
,
trees
3000
x146
1659F
Tree and Permutation Game
dfs and similar
,
games
,
graphs
,
trees
3000
x152
1797F
Li Hua and Path
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
trees
3000
x183
434E
Furukawa Nagisa's Tree
binary search
,
divide and conquer
,
sortings
,
trees
3000
x220
1776M
Parmigiana With Seafood
binary search
,
dp
,
greedy
,
trees
3000
x221
1252D
Find String in a Grid
data structures
,
dp
,
strings
,
trees
3000
x226
1168D
Anagram Paths
dp
,
implementation
,
trees
3000
x243
1801E
Gasoline prices
data structures
,
divide and conquer
,
dsu
,
hashing
,
trees
3000
x260
1763F
Edge Queries
data structures
,
dfs and similar
,
dp
,
dsu
,
graphs
,
trees
3000
x273
1787G
Colorful Tree Again
brute force
,
data structures
,
trees
3000
x282
533A
Berland Miners
binary search
,
data structures
,
dfs and similar
,
greedy
,
trees
3000
x292
1299D
Around the World
bitmasks
,
combinatorics
,
dfs and similar
,
dp
,
graphs
,
graphs
,
math
,
trees
3000
x366
1381D
The Majestic Brown Tree Snake
dfs and similar
,
dp
,
greedy
,
trees
,
two pointers
3000
x377
696E
...Wait for it...
data structures
,
dsu
,
trees
3000
x390
1438F
Olha and Igor
interactive
,
probabilities
,
trees
3000
x423
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