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Before contest
Codeforces Round #792 (Div. 1)
3 days
Before contest
Codeforces Round #792 (Div. 2)
3 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
1211H
Road Repair in Treeland
*special problem
,
binary search
,
dp
,
trees
3100
x30
690F3
Tree of Life (hard)
trees
3200
x33
1423C
Dušan's Railway
divide and conquer
,
graphs
,
trees
3500
x41
1326G
Spiderweb Trees
dp
,
geometry
,
trees
3500
x49
1322F
Assigning Fares
dp
,
trees
3500
x51
1211G
King's Path
*special problem
,
math
,
trees
2500
x52
923F
Public Service
constructive algorithms
,
graphs
,
trees
3200
x57
1585G
Poachers
dp
,
games
,
graphs
,
trees
2500
x60
690F2
Tree of Life (medium)
constructive algorithms
,
hashing
,
trees
2700
x61
457F
An easy problem about trees
dp
,
games
,
greedy
,
trees
3200
x62
1023G
Pisces
data structures
,
flows
,
trees
3400
x70
1659F
Tree and Permutation Game
dfs and similar
,
games
,
graphs
,
trees
3000
x77
1158E
Strange device
binary search
,
interactive
,
math
,
trees
3400
x77
917E
Upside Down
data structures
,
string suffix structures
,
strings
,
trees
3400
x77
1444E
Finding the Vertex
brute force
,
dfs and similar
,
dp
,
interactive
,
trees
3500
x78
1621H
Trains and Airplanes
dfs and similar
,
graphs
,
shortest paths
,
trees
3500
x80
98B
Help King
implementation
,
probabilities
,
trees
2200
x80
1608G
Alphabetic Tree
binary search
,
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
3500
x86
251E
Tree and Table
dfs and similar
,
dp
,
implementation
,
trees
3000
x89
1439E
Cheat and Win
bitmasks
,
data structures
,
games
,
trees
3500
x90
786D
Rap God
data structures
,
dfs and similar
,
hashing
,
strings
,
trees
3400
x92
772E
Verifying Kingdom
binary search
,
divide and conquer
,
interactive
,
trees
3200
x92
500G
New Year Running
number theory
,
trees
3200
x92
1208H
Red Blue Tree
data structures
,
implementation
,
trees
3500
x94
962G
Visible Black Areas
data structures
,
dsu
,
geometry
,
trees
2800
x94
1464F
My Beautiful Madness
data structures
,
trees
3500
x99
871E
Restore the Tree
graphs
,
greedy
,
trees
2900
x104
1534H
Lost Nodes
constructive algorithms
,
dp
,
graphs
,
interactive
,
sortings
,
trees
3500
x105
1458F
Range Diameter Sum
data structures
,
trees
3500
x110
914H
Ember and Storm's Tree Game
combinatorics
,
dp
,
games
,
trees
3400
x120
331D3
Escaping on Beaveractor
data structures
,
implementation
,
trees
3000
x120
1045J
Moonwalk challenge
data structures
,
strings
,
trees
2600
x121
980F
Cactus to Tree
dp
,
graphs
,
trees
2900
x121
891D
Sloth
dfs and similar
,
dp
,
graph matchings
,
trees
3100
x124
1336F
Journey
data structures
,
divide and conquer
,
graphs
,
trees
3500
x125
1427F
Boring Card Game
data structures
,
greedy
,
trees
3200
x129
1344E
Train Tracks
data structures
,
trees
3100
x133
48G
Galaxy Union
dp
,
trees
,
two pointers
2700
x135
1450G
Communism
bitmasks
,
dp
,
trees
3500
x140
1680F
Lenient Vertex Cover
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
trees
x146
936E
Iqea
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
shortest paths
,
trees
3400
x147
482E
ELCA
data structures
,
trees
3200
x149
1053E
Euler tour
constructive algorithms
,
trees
3500
x150
627F
Island Puzzle
dfs and similar
,
dsu
,
graphs
,
trees
3400
x153
855G
Harry Vs Voldemort
dfs and similar
,
dp
,
graphs
,
trees
3300
x154
42E
Baldman and the military
dfs and similar
,
graphs
,
trees
2700
x154
830E
Perpetual Motion Machine
constructive algorithms
,
dp
,
graphs
,
implementation
,
math
,
trees
3100
x157
1495F
Squares
constructive algorithms
,
data structures
,
dp
,
graphs
,
trees
3300
x158
1010F
Tree
fft
,
graphs
,
trees
3400
x158
1402C
Star Trek
*special problem
,
combinatorics
,
dfs and similar
,
dp
,
games
,
graphs
,
matrices
,
trees
2600
x160
403E
Two Rooted Trees
data structures
,
implementation
,
trees
2900
x161
1654G
Snowy Mountain
data structures
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
,
trees
2900
x163
1007D
Ants
2-sat
,
data structures
,
trees
3200
x169
960H
Santa's Gift
data structures
,
trees
3100
x169
1583H
Omkar and Tours
data structures
,
divide and conquer
,
sortings
,
trees
3300
x175
1610H
Squid Game
data structures
,
dfs and similar
,
greedy
,
trees
3100
x176
802L
Send the Fool Further! (hard)
dfs and similar
,
dp
,
math
,
trees
2400
x176
1109F
Sasha and Algorithm of Silence's Sounds
data structures
,
trees
3200
x179
1648E
Air Reform
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
implementation
,
trees
3200
x180
1297E
Modernization of Treeland
*special problem
,
dfs and similar
,
trees
x180
1575E
Eye-Pleasing City Park Tour
data structures
,
trees
2600
x183
434E
Furukawa Nagisa's Tree
binary search
,
divide and conquer
,
sortings
,
trees
3000
x184
1254E
Send Tree to Charlie
combinatorics
,
dfs and similar
,
dsu
,
trees
3300
x189
1610I
Mashtali vs AtCoder
games
,
trees
3100
x193
1252D
Find String in a Grid
data structures
,
dp
,
strings
,
trees
3000
x197
955F
Heaps
dp
,
trees
2600
x198
793E
Problem of offices
constructive algorithms
,
dfs and similar
,
dp
,
trees
2900
x198
704E
Iron Man
data structures
,
geometry
,
trees
3300
x201
117E
Tree or not Tree
data structures
,
divide and conquer
,
implementation
,
trees
2900
x201
1368G
Shifting Dominoes
data structures
,
geometry
,
graphs
,
trees
3200
x207
1662G
Gastronomic Event
dp
,
greedy
,
trees
x208
1633F
Perfect Matching
data structures
,
divide and conquer
,
interactive
,
trees
2800
x213
1482H
Exam
data structures
,
string suffix structures
,
trees
3400
x221
1168D
Anagram Paths
dp
,
implementation
,
trees
3000
x221
1284F
New Year and Social Network
data structures
,
graph matchings
,
graphs
,
math
,
trees
3200
x222
81E
Pairs
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
trees
2700
x223
533A
Berland Miners
binary search
,
data structures
,
dfs and similar
,
greedy
,
trees
3000
x227
1396E
Distance Matching
constructive algorithms
,
dfs and similar
,
trees
3200
x232
217E
Alien DNA
data structures
,
dsu
,
trees
2800
x234
1508E
Tree Calendar
brute force
,
constructive algorithms
,
data structures
,
dfs and similar
,
sortings
,
trees
3100
x235
822F
Madness
constructive algorithms
,
dfs and similar
,
trees
2500
x235
762F
Tree nesting
combinatorics
,
graphs
,
trees
2800
x236
1045A
Last chance
data structures
,
flows
,
graph matchings
,
graphs
,
trees
2500
x241
1019E
Raining season
data structures
,
divide and conquer
,
trees
3200
x242
842E
Nikita and game
binary search
,
dfs and similar
,
divide and conquer
,
graphs
,
trees
2800
x242
1517F
Reunion
combinatorics
,
dp
,
trees
3200
x245
1481F
AB Tree
dp
,
greedy
,
trees
3100
x250
536E
Tavas on the Path
data structures
,
divide and conquer
,
trees
3100
x250
1389G
Directing Edges
dfs and similar
,
dp
,
graphs
,
trees
2800
x254
1452G
Game On Tree
data structures
,
dfs and similar
,
greedy
,
trees
2700
x255
1361D
Johnny and James
greedy
,
implementation
,
math
,
trees
2900
x256
1379E
Inverse Genealogy
constructive algorithms
,
divide and conquer
,
dp
,
math
,
trees
2800
x257
97E
Leaders
dfs and similar
,
dsu
,
graphs
,
trees
2200
x260
833D
Red-Black Cobweb
data structures
,
divide and conquer
,
implementation
,
trees
2800
x271
847L
Berland SU Computer Network
constructive algorithms
,
dfs and similar
,
graphs
,
hashing
,
trees
2400
x274
925E
May Holidays
data structures
,
trees
2900
x275
1276D
Tree Elimination
dp
,
trees
2900
x277
1129E
Legendary Tree
binary search
,
interactive
,
trees
3100
x279
840E
In a Trap
trees
3200
x279
1140G
Double Tree
data structures
,
divide and conquer
,
shortest paths
,
trees
2700
x285
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