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Problems
#
Name
1712F
Triameter
binary search
,
data structures
,
dfs and similar
,
trees
3200
x306
217E
Alien DNA
data structures
,
dsu
,
trees
2800
x293
1718D
Permutation for Burenka
data structures
,
graph matchings
,
greedy
,
math
,
trees
3300
x290
822F
Madness
constructive algorithms
,
dfs and similar
,
trees
2500
x289
1464F
My Beautiful Madness
data structures
,
trees
3500
x288
802L
Send the Fool Further! (hard)
dfs and similar
,
dp
,
math
,
trees
2400
x286
1109F
Sasha and Algorithm of Silence's Sounds
data structures
,
trees
3200
x283
1495F
Squares
constructive algorithms
,
data structures
,
dp
,
graphs
,
trees
3300
x282
830E
Perpetual Motion Machine
constructive algorithms
,
dp
,
graphs
,
implementation
,
math
,
trees
3100
x273
704E
Iron Man
data structures
,
geometry
,
trees
3300
x273
1610I
Mashtali vs AtCoder
games
,
trees
3100
x266
1254E
Send Tree to Charlie
combinatorics
,
dfs and similar
,
dsu
,
trees
3300
x262
1458F
Range Diameter Sum
data structures
,
trees
3500
x259
1930G
Prefix Max Set Counting
data structures
,
dp
,
trees
3100
x258
1007D
Ants
2-sat
,
data structures
,
trees
3200
x258
960H
Santa's Gift
data structures
,
trees
3100
x257
1876E
Ball-Stackable
constructive algorithms
,
data structures
,
dp
,
trees
3300
x256
48G
Galaxy Union
dp
,
trees
,
two pointers
2700
x255
434E
Furukawa Nagisa's Tree
binary search
,
divide and conquer
,
sortings
,
trees
3000
x254
1868D
Flower-like Pseudotree
constructive algorithms
,
graphs
,
greedy
,
implementation
,
trees
3000
x250
1767F
Two Subtrees
data structures
,
trees
3100
x250
1819E
Roads in E City
interactive
,
math
,
probabilities
,
trees
3200
x249
793E
Problem of offices
constructive algorithms
,
dfs and similar
,
dp
,
trees
2900
x245
1450G
Communism
bitmasks
,
dp
,
trees
3500
x234
627F
Island Puzzle
dfs and similar
,
dsu
,
graphs
,
trees
3400
x234
914H
Ember and Storm's Tree Game
combinatorics
,
dp
,
games
,
trees
3400
x233
1976F
Remove Bridges
data structures
,
dfs and similar
,
dp
,
greedy
,
sortings
,
trees
x228
1781G
Diverse Coloring
constructive algorithms
,
trees
3200
x217
1439E
Cheat and Win
bitmasks
,
data structures
,
games
,
trees
3500
x216
1010F
Tree
fft
,
graphs
,
trees
3400
x212
1951H
Thanos Snap
binary search
,
dp
,
games
,
greedy
,
trees
3200
x211
1939B
Evidence Board
*special problem
,
constructive algorithms
,
dfs and similar
,
graphs
,
trees
x210
1970G3
Min-Fund Prison (Hard)
bitmasks
,
dfs and similar
,
dp
,
graphs
,
trees
2400
x206
1740H
MEX Tree Manipulation
data structures
,
trees
3300
x204
403E
Two Rooted Trees
data structures
,
implementation
,
trees
2900
x202
1336F
Journey
data structures
,
divide and conquer
,
graphs
,
trees
3500
x201
1297E
Modernization of Treeland
*special problem
,
dfs and similar
,
trees
x200
855G
Harry Vs Voldemort
dfs and similar
,
dp
,
graphs
,
trees
3300
x200
1402C
Star Trek
*special problem
,
combinatorics
,
dfs and similar
,
dp
,
games
,
graphs
,
matrices
,
trees
2600
x199
1053E
Euler tour
constructive algorithms
,
trees
3500
x197
980F
Cactus to Tree
dp
,
graphs
,
trees
2900
x193
42E
Baldman and the military
dfs and similar
,
graphs
,
trees
2700
x193
1725I
Imitating the Key Tree
combinatorics
,
dsu
,
trees
2800
x189
1659F
Tree and Permutation Game
dfs and similar
,
games
,
graphs
,
trees
3000
x184
936E
Iqea
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
shortest paths
,
trees
3400
x183
482E
ELCA
data structures
,
trees
3200
x176
1585G
Poachers
dp
,
games
,
graphs
,
trees
2500
x172
1919G
Tree LGM
constructive algorithms
,
divide and conquer
,
games
,
trees
3500
x171
331D3
Escaping on Beaveractor
data structures
,
implementation
,
trees
3000
x171
891D
Sloth
dfs and similar
,
dp
,
graph matchings
,
trees
3100
x170
251E
Tree and Table
dfs and similar
,
dp
,
implementation
,
trees
3000
x169
1045J
Moonwalk challenge
data structures
,
strings
,
trees
2600
x166
1910F
Build Railway Stations
*special problem
,
greedy
,
trees
2000
x164
1621H
Trains and Airplanes
dfs and similar
,
graphs
,
shortest paths
,
trees
3500
x163
500G
New Year Running
number theory
,
trees
3200
x157
1608G
Alphabetic Tree
binary search
,
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
3500
x151
1158E
Strange device
binary search
,
interactive
,
math
,
trees
3400
x148
871E
Restore the Tree
graphs
,
greedy
,
trees
2900
x148
1534H
Lost Nodes
constructive algorithms
,
dp
,
graphs
,
interactive
,
sortings
,
trees
3500
x144
1208H
Red Blue Tree
data structures
,
implementation
,
trees
3500
x143
786D
Rap God
data structures
,
dfs and similar
,
hashing
,
strings
,
trees
3400
x138
1916G
Optimizations From Chelsu
divide and conquer
,
dp
,
number theory
,
trees
3500
x134
1919H
Tree Diameter
interactive
,
trees
2000
x133
1444E
Finding the Vertex
brute force
,
dfs and similar
,
dp
,
interactive
,
trees
3500
x133
1423C
Dušan's Railway
divide and conquer
,
graphs
,
trees
3500
x131
1930H
Interactive Mex Tree
constructive algorithms
,
dfs and similar
,
interactive
,
trees
3300
x128
1824E
LuoTianyi and Cartridge
data structures
,
trees
3500
x127
962G
Visible Black Areas
data structures
,
dsu
,
geometry
,
trees
2800
x126
917E
Upside Down
data structures
,
string suffix structures
,
strings
,
trees
3400
x123
772E
Verifying Kingdom
binary search
,
divide and conquer
,
interactive
,
trees
3200
x123
1876G
Clubstep
binary search
,
brute force
,
data structures
,
greedy
,
trees
3500
x118
98B
Help King
implementation
,
probabilities
,
trees
2200
x115
1023G
Pisces
data structures
,
flows
,
trees
3400
x114
457F
An easy problem about trees
dp
,
games
,
greedy
,
trees
3200
x104
1889E
Doremy's Swapping Trees
dfs and similar
,
graphs
,
trees
3500
x100
1761G
Centroid Guess
interactive
,
probabilities
,
trees
3500
x100
1322F
Assigning Fares
dp
,
trees
3500
x91
690F2
Tree of Life (medium)
constructive algorithms
,
hashing
,
trees
2700
x79
1870H
Standard Graph Problem
data structures
,
graphs
,
greedy
,
trees
3500
x78
1863H
Goldberg Machine 3
dp
,
trees
3500
x73
923F
Public Service
constructive algorithms
,
graphs
,
trees
3200
x73
1326G
Spiderweb Trees
dp
,
geometry
,
trees
3500
x72
1863I
Redundant Routes
constructive algorithms
,
dp
,
trees
3500
x71
1889F
Doremy's Average Tree
data structures
,
dp
,
greedy
,
trees
3500
x69
1942H
Farmer John's Favorite Intern
data structures
,
dp
,
flows
,
trees
3500
x67
1211G
King's Path
*special problem
,
math
,
trees
2500
x67
1981F
Turtle and Paths on a Tree
data structures
,
dp
,
trees
x48
690F3
Tree of Life (hard)
trees
3200
x46
1211H
Road Repair in Treeland
*special problem
,
binary search
,
dp
,
trees
3100
x42
1940C
Burenka and Pether
*special problem
,
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
sortings
,
trees
x33
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Codeforces Round 950 (Div. 3)
45:04:51
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combine-tags-by-or
*combine tags by OR
2-sat
binary search
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data structures
dfs and similar
divide and conquer
dp
dsu
expression parsing
fft
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graph matchings
graphs
greedy
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strings
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