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Before contest
Codeforces Round 940 (Div. 2) and CodeCraft-23
35:34:21
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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
1940C
Burenka and Pether
*special problem
,
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
sortings
,
trees
x31
1211H
Road Repair in Treeland
*special problem
,
binary search
,
dp
,
trees
3100
x41
690F3
Tree of Life (hard)
trees
3200
x44
1942H
Farmer John's Favorite Intern
data structures
,
dp
,
flows
,
trees
3500
x52
1863I
Redundant Routes
constructive algorithms
,
dp
,
trees
3500
x66
1211G
King's Path
*special problem
,
math
,
trees
2500
x66
1889F
Doremy's Average Tree
data structures
,
dp
,
greedy
,
trees
3500
x67
1863H
Goldberg Machine 3
dp
,
trees
3500
x69
1326G
Spiderweb Trees
dp
,
geometry
,
trees
3500
x69
923F
Public Service
constructive algorithms
,
graphs
,
trees
3200
x71
1870H
Standard Graph Problem
data structures
,
graphs
,
greedy
,
trees
3500
x76
690F2
Tree of Life (medium)
constructive algorithms
,
hashing
,
trees
2700
x76
1889E
Doremy's Swapping Trees
dfs and similar
,
graphs
,
trees
3500
x84
1322F
Assigning Fares
dp
,
trees
3500
x87
1761G
Centroid Guess
interactive
,
probabilities
,
trees
3500
x95
457F
An easy problem about trees
dp
,
games
,
greedy
,
trees
3200
x102
1930H
Interactive Mex Tree
constructive algorithms
,
dfs and similar
,
interactive
,
trees
3300
x111
1023G
Pisces
data structures
,
flows
,
trees
3400
x111
1876G
Clubstep
binary search
,
brute force
,
data structures
,
greedy
,
trees
3500
x114
98B
Help King
implementation
,
probabilities
,
trees
2200
x114
917E
Upside Down
data structures
,
string suffix structures
,
strings
,
trees
3400
x119
772E
Verifying Kingdom
binary search
,
divide and conquer
,
interactive
,
trees
3200
x121
1824E
LuoTianyi and Cartridge
data structures
,
trees
3500
x123
962G
Visible Black Areas
data structures
,
dsu
,
geometry
,
trees
2800
x124
1919H
Tree Diameter
interactive
,
trees
2000
x126
1444E
Finding the Vertex
brute force
,
dfs and similar
,
dp
,
interactive
,
trees
3500
x129
1423C
Dušan's Railway
divide and conquer
,
graphs
,
trees
3500
x129
1916G
Optimizations From Chelsu
divide and conquer
,
dp
,
number theory
,
trees
3500
x131
786D
Rap God
data structures
,
dfs and similar
,
hashing
,
strings
,
trees
3400
x134
1208H
Red Blue Tree
data structures
,
implementation
,
trees
3500
x140
1534H
Lost Nodes
constructive algorithms
,
dp
,
graphs
,
interactive
,
sortings
,
trees
3500
x142
871E
Restore the Tree
graphs
,
greedy
,
trees
2900
x145
1608G
Alphabetic Tree
binary search
,
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
3500
x146
1158E
Strange device
binary search
,
interactive
,
math
,
trees
3400
x146
1910F
Build Railway Stations
*special problem
,
greedy
,
trees
2000
x153
500G
New Year Running
number theory
,
trees
3200
x154
1045J
Moonwalk challenge
data structures
,
strings
,
trees
2600
x159
1621H
Trains and Airplanes
dfs and similar
,
graphs
,
shortest paths
,
trees
3500
x160
1951H
Thanos Snap
binary search
,
dp
,
games
,
greedy
,
trees
3200
x161
1919G
Tree LGM
constructive algorithms
,
divide and conquer
,
games
,
trees
3500
x164
331D3
Escaping on Beaveractor
data structures
,
implementation
,
trees
3000
x167
251E
Tree and Table
dfs and similar
,
dp
,
implementation
,
trees
3000
x167
1585G
Poachers
dp
,
games
,
graphs
,
trees
2500
x168
891D
Sloth
dfs and similar
,
dp
,
graph matchings
,
trees
3100
x168
482E
ELCA
data structures
,
trees
3200
x174
1659F
Tree and Permutation Game
dfs and similar
,
games
,
graphs
,
trees
3000
x176
936E
Iqea
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
shortest paths
,
trees
3400
x181
1725I
Imitating the Key Tree
combinatorics
,
dsu
,
trees
2800
x182
42E
Baldman and the military
dfs and similar
,
graphs
,
trees
2700
x186
980F
Cactus to Tree
dp
,
graphs
,
trees
2900
x189
1053E
Euler tour
constructive algorithms
,
trees
3500
x192
1336F
Journey
data structures
,
divide and conquer
,
graphs
,
trees
3500
x193
1402C
Star Trek
*special problem
,
combinatorics
,
dfs and similar
,
dp
,
games
,
graphs
,
matrices
,
trees
2600
x195
1297E
Modernization of Treeland
*special problem
,
dfs and similar
,
trees
x197
1740H
MEX Tree Manipulation
data structures
,
trees
3300
x198
855G
Harry Vs Voldemort
dfs and similar
,
dp
,
graphs
,
trees
3300
x198
403E
Two Rooted Trees
data structures
,
implementation
,
trees
2900
x200
1939B
Evidence Board
*special problem
,
constructive algorithms
,
dfs and similar
,
graphs
,
trees
x205
1010F
Tree
fft
,
graphs
,
trees
3400
x206
1781G
Diverse Coloring
constructive algorithms
,
trees
3200
x212
1876E
Ball-Stackable
constructive algorithms
,
data structures
,
dp
,
trees
3300
x213
1439E
Cheat and Win
bitmasks
,
data structures
,
games
,
trees
3500
x213
1930G
Prefix Max Set Counting
data structures
,
dp
,
trees
3100
x214
914H
Ember and Storm's Tree Game
combinatorics
,
dp
,
games
,
trees
3400
x225
1450G
Communism
bitmasks
,
dp
,
trees
3500
x226
627F
Island Puzzle
dfs and similar
,
dsu
,
graphs
,
trees
3400
x228
793E
Problem of offices
constructive algorithms
,
dfs and similar
,
dp
,
trees
2900
x238
1819E
Roads in E City
interactive
,
math
,
probabilities
,
trees
3200
x239
1868D
Flower-like Pseudotree
constructive algorithms
,
graphs
,
greedy
,
implementation
,
trees
3000
x243
1767F
Two Subtrees
data structures
,
trees
3100
x244
960H
Santa's Gift
data structures
,
trees
3100
x252
434E
Furukawa Nagisa's Tree
binary search
,
divide and conquer
,
sortings
,
trees
3000
x252
48G
Galaxy Union
dp
,
trees
,
two pointers
2700
x252
1610I
Mashtali vs AtCoder
games
,
trees
3100
x254
1007D
Ants
2-sat
,
data structures
,
trees
3200
x254
1458F
Range Diameter Sum
data structures
,
trees
3500
x257
1254E
Send Tree to Charlie
combinatorics
,
dfs and similar
,
dsu
,
trees
3300
x258
1344E
Train Tracks
data structures
,
trees
3100
x266
1464F
My Beautiful Madness
data structures
,
trees
3500
x270
830E
Perpetual Motion Machine
constructive algorithms
,
dp
,
graphs
,
implementation
,
math
,
trees
3100
x271
704E
Iron Man
data structures
,
geometry
,
trees
3300
x271
1495F
Squares
constructive algorithms
,
data structures
,
dp
,
graphs
,
trees
3300
x274
802L
Send the Fool Further! (hard)
dfs and similar
,
dp
,
math
,
trees
2400
x276
1109F
Sasha and Algorithm of Silence's Sounds
data structures
,
trees
3200
x277
1718D
Permutation for Burenka
data structures
,
graph matchings
,
greedy
,
math
,
trees
3300
x285
822F
Madness
constructive algorithms
,
dfs and similar
,
trees
2500
x287
217E
Alien DNA
data structures
,
dsu
,
trees
2800
x289
1949J
Amanda the Amoeba
graphs
,
implementation
,
trees
,
two pointers
x294
1904F
Beautiful Tree
data structures
,
dfs and similar
,
graphs
,
implementation
,
trees
2800
x299
1712F
Triameter
binary search
,
data structures
,
dfs and similar
,
trees
3200
x300
1575E
Eye-Pleasing City Park Tour
data structures
,
trees
2600
x300
1427F
Boring Card Game
data structures
,
greedy
,
trees
3200
x300
1633F
Perfect Matching
data structures
,
divide and conquer
,
interactive
,
trees
2800
x303
1361D
Johnny and James
greedy
,
implementation
,
math
,
trees
2900
x305
1284F
New Year and Social Network
data structures
,
graph matchings
,
graphs
,
math
,
trees
3200
x305
117E
Tree or not Tree
data structures
,
divide and conquer
,
implementation
,
trees
2900
x306
1583H
Omkar and Tours
data structures
,
divide and conquer
,
sortings
,
trees
3300
x312
1045A
Last chance
data structures
,
flows
,
graph matchings
,
graphs
,
trees
2500
x313
847L
Berland SU Computer Network
constructive algorithms
,
dfs and similar
,
graphs
,
hashing
,
trees
2400
x313
1396E
Distance Matching
constructive algorithms
,
dfs and similar
,
trees
3200
x318
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