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Before contest
Codeforces Round #793 (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
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
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
1608G
Alphabetic Tree
binary search
,
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
3500
x87
1439E
Cheat and Win
bitmasks
,
data structures
,
games
,
trees
3500
x92
1208H
Red Blue Tree
data structures
,
implementation
,
trees
3500
x94
1464F
My Beautiful Madness
data structures
,
trees
3500
x99
1534H
Lost Nodes
constructive algorithms
,
dp
,
graphs
,
interactive
,
sortings
,
trees
3500
x105
1458F
Range Diameter Sum
data structures
,
trees
3500
x110
1336F
Journey
data structures
,
divide and conquer
,
graphs
,
trees
3500
x125
1450G
Communism
bitmasks
,
dp
,
trees
3500
x140
1053E
Euler tour
constructive algorithms
,
trees
3500
x151
1023G
Pisces
data structures
,
flows
,
trees
3400
x71
1158E
Strange device
binary search
,
interactive
,
math
,
trees
3400
x77
917E
Upside Down
data structures
,
string suffix structures
,
strings
,
trees
3400
x77
786D
Rap God
data structures
,
dfs and similar
,
hashing
,
strings
,
trees
3400
x92
914H
Ember and Storm's Tree Game
combinatorics
,
dp
,
games
,
trees
3400
x121
936E
Iqea
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
shortest paths
,
trees
3400
x147
1010F
Tree
fft
,
graphs
,
trees
3400
x158
627F
Island Puzzle
dfs and similar
,
dsu
,
graphs
,
trees
3400
x158
1482H
Exam
data structures
,
string suffix structures
,
trees
3400
x221
757G
Can Bash Save the Day?
data structures
,
divide and conquer
,
graphs
,
trees
3400
x294
1137F
Matches Are Not a Child's Play
data structures
,
trees
3400
x311
1491H
Yuezheng Ling and Dynamic Tree
data structures
,
trees
3400
x394
1119F
Niyaz and Small Degrees
data structures
,
dp
,
trees
3400
x420
855G
Harry Vs Voldemort
dfs and similar
,
dp
,
graphs
,
trees
3300
x154
1495F
Squares
constructive algorithms
,
data structures
,
dp
,
graphs
,
trees
3300
x158
1583H
Omkar and Tours
data structures
,
divide and conquer
,
sortings
,
trees
3300
x175
1254E
Send Tree to Charlie
combinatorics
,
dfs and similar
,
dsu
,
trees
3300
x189
704E
Iron Man
data structures
,
geometry
,
trees
3300
x201
639F
Bear and Chemistry
data structures
,
dfs and similar
,
graphs
,
trees
3300
x287
1307F
Cow and Vacation
dfs and similar
,
dsu
,
trees
3300
x351
526G
Spiders Evil Plan
greedy
,
trees
3300
x457
690F3
Tree of Life (hard)
trees
3200
x33
923F
Public Service
constructive algorithms
,
graphs
,
trees
3200
x57
457F
An easy problem about trees
dp
,
games
,
greedy
,
trees
3200
x62
772E
Verifying Kingdom
binary search
,
divide and conquer
,
interactive
,
trees
3200
x92
500G
New Year Running
number theory
,
trees
3200
x92
1427F
Boring Card Game
data structures
,
greedy
,
trees
3200
x129
482E
ELCA
data structures
,
trees
3200
x149
1007D
Ants
2-sat
,
data structures
,
trees
3200
x169
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
x181
1368G
Shifting Dominoes
data structures
,
geometry
,
graphs
,
trees
3200
x207
1284F
New Year and Social Network
data structures
,
graph matchings
,
graphs
,
math
,
trees
3200
x222
1396E
Distance Matching
constructive algorithms
,
dfs and similar
,
trees
3200
x232
1019E
Raining season
data structures
,
divide and conquer
,
trees
3200
x242
1517F
Reunion
combinatorics
,
dp
,
trees
3200
x246
840E
In a Trap
trees
3200
x281
578F
Mirror Box
matrices
,
trees
3200
x342
566E
Restoring Map
bitmasks
,
constructive algorithms
,
trees
3200
x371
786E
ALT
data structures
,
flows
,
graphs
,
trees
3200
x379
650E
Clockwork Bomb
data structures
,
dfs and similar
,
dsu
,
greedy
,
trees
3200
x423
487E
Tourists
data structures
,
dfs and similar
,
graphs
,
trees
3200
x1107
1211H
Road Repair in Treeland
*special problem
,
binary search
,
dp
,
trees
3100
x30
891D
Sloth
dfs and similar
,
dp
,
graph matchings
,
trees
3100
x124
1344E
Train Tracks
data structures
,
trees
3100
x134
830E
Perpetual Motion Machine
constructive algorithms
,
dp
,
graphs
,
implementation
,
math
,
trees
3100
x157
960H
Santa's Gift
data structures
,
trees
3100
x169
1610H
Squid Game
data structures
,
dfs and similar
,
greedy
,
trees
3100
x180
1610I
Mashtali vs AtCoder
games
,
trees
3100
x196
1508E
Tree Calendar
brute force
,
constructive algorithms
,
data structures
,
dfs and similar
,
sortings
,
trees
3100
x236
1481F
AB Tree
dp
,
greedy
,
trees
3100
x250
536E
Tavas on the Path
data structures
,
divide and conquer
,
trees
3100
x250
1129E
Legendary Tree
binary search
,
interactive
,
trees
3100
x279
1383C
String Transformation 2
bitmasks
,
dp
,
graphs
,
trees
3100
x342
1628E
Groceries in Meteor Town
binary search
,
data structures
,
dsu
,
trees
3100
x367
1110G
Tree-Tac-Toe
constructive algorithms
,
games
,
trees
3100
x405
571D
Campus
binary search
,
data structures
,
dsu
,
trees
3100
x482
809E
Surprise me!
divide and conquer
,
math
,
number theory
,
trees
3100
x514
176E
Archaeology
data structures
,
dfs and similar
,
trees
3100
x622
1659F
Tree and Permutation Game
dfs and similar
,
games
,
graphs
,
trees
3000
x77
251E
Tree and Table
dfs and similar
,
dp
,
implementation
,
trees
3000
x89
331D3
Escaping on Beaveractor
data structures
,
implementation
,
trees
3000
x121
434E
Furukawa Nagisa's Tree
binary search
,
divide and conquer
,
sortings
,
trees
3000
x184
1252D
Find String in a Grid
data structures
,
dp
,
strings
,
trees
3000
x197
1168D
Anagram Paths
dp
,
implementation
,
trees
3000
x221
533A
Berland Miners
binary search
,
data structures
,
dfs and similar
,
greedy
,
trees
3000
x227
1381D
The Majestic Brown Tree Snake
dfs and similar
,
dp
,
greedy
,
trees
,
two pointers
3000
x287
1299D
Around the World
bitmasks
,
combinatorics
,
dfs and similar
,
dp
,
graphs
,
graphs
,
math
,
trees
3000
x310
1442E
Black, White and Grey Tree
binary search
,
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
3000
x336
696E
...Wait for it...
data structures
,
dsu
,
trees
3000
x340
1438F
Olha and Igor
interactive
,
probabilities
,
trees
3000
x344
1361E
James and the Chase
dfs and similar
,
graphs
,
probabilities
,
trees
3000
x352
1097G
Vladislav and a Great Legend
combinatorics
,
dp
,
trees
3000
x407
150E
Freezing with Style
binary search
,
data structures
,
divide and conquer
,
trees
3000
x449
1320E
Treeland and Viruses
data structures
,
dfs and similar
,
dp
,
shortest paths
,
trees
3000
x459
566C
Logistical Questions
dfs and similar
,
divide and conquer
,
trees
3000
x496
504E
Misha and LCP on Tree
binary search
,
dfs and similar
,
hashing
,
string suffix structures
,
trees
3000
x596
603E
Pastoral Oddities
data structures
,
divide and conquer
,
dsu
,
math
,
trees
3000
x641
871E
Restore the Tree
graphs
,
greedy
,
trees
2900
x104
980F
Cactus to Tree
dp
,
graphs
,
trees
2900
x121
403E
Two Rooted Trees
data structures
,
implementation
,
trees
2900
x161
1654G
Snowy Mountain
data structures
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
,
trees
2900
x167
793E
Problem of offices
constructive algorithms
,
dfs and similar
,
dp
,
trees
2900
x198
117E
Tree or not Tree
data structures
,
divide and conquer
,
implementation
,
trees
2900
x201
1361D
Johnny and James
greedy
,
implementation
,
math
,
trees
2900
x256
925E
May Holidays
data structures
,
trees
2900
x275
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