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Before contest
Kotlin Heroes: Practice 6
23:28:21
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Before contest
Educational Codeforces Round 105 (Rated for Div. 2)
24:28:22
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Difficulty:
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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
x30
1326G
Spiderweb Trees
dp
,
geometry
,
trees
3500
x32
1322F
Assigning Fares
dp
,
trees
3500
x35
1464F
My Beautiful Madness
data structures
,
trees
3500
x46
1458F
Range Diameter Sum
data structures
,
trees
3500
x52
1444E
Finding the Vertex
brute force
,
dfs and similar
,
dp
,
interactive
,
trees
3500
x52
1208H
Red Blue Tree
data structures
,
implementation
,
trees
3500
x52
1439E
Cheat and Win
bitmasks
,
data structures
,
games
,
trees
3500
x57
1450G
Communism
bitmasks
,
dp
,
trees
3500
x70
1336F
Journey
data structures
,
divide and conquer
,
graphs
,
trees
3500
x90
1053E
Euler tour
constructive algorithms
,
trees
3500
x113
1023G
Pisces
data structures
,
flows
,
trees
3400
x41
1158E
Strange device
binary search
,
interactive
,
math
,
trees
3400
x61
917E
Upside Down
data structures
,
string suffix structures
,
strings
,
trees
3400
x68
786D
Rap God
data structures
,
dfs and similar
,
hashing
,
strings
,
trees
3400
x70
914H
Ember and Storm's Tree Game
combinatorics
,
dp
,
games
,
trees
3400
x79
627F
Island Puzzle
dfs and similar
,
dsu
,
graphs
,
trees
3400
x120
1010F
Tree
fft
,
graphs
,
trees
3400
x121
936E
Iqea
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
shortest paths
,
trees
3400
x130
757G
Can Bash Save the Day?
data structures
,
divide and conquer
,
graphs
,
trees
3400
x194
1119F
Niyaz and Small Degrees
data structures
,
dp
,
trees
3400
x216
1137F
Matches Are Not a Child's Play
data structures
,
trees
3400
x233
855G
Harry Vs Voldemort
dfs and similar
,
dp
,
graphs
,
trees
3300
x140
1254E
Send Tree to Charlie
combinatorics
,
dfs and similar
,
dsu
,
trees
3300
x141
704E
Iron Man
data structures
,
geometry
,
trees
3300
x163
639F
Bear and Chemistry
data structures
,
dfs and similar
,
graphs
,
trees
3300
x224
1307F
Cow and Vacation
dfs and similar
,
dsu
,
trees
3300
x280
526G
Spiders Evil Plan
greedy
,
trees
3300
x291
690F3
Tree of Life (hard)
trees
3200
x28
923F
Public Service
constructive algorithms
,
graphs
,
trees
3200
x40
457F
An easy problem about trees
dp
,
games
,
greedy
,
trees
3200
x55
500G
New Year Running
number theory
,
trees
3200
x74
772E
Verifying Kingdom
binary search
,
divide and conquer
,
interactive
,
trees
3200
x78
1427F
Boring Card Game
data structures
,
greedy
,
trees
3200
x87
1007D
Ants
2-sat
,
data structures
,
trees
3200
x114
482E
ELCA
data structures
,
trees
3200
x138
1109F
Sasha and Algorithm of Silence's Sounds
data structures
,
trees
3200
x148
1368G
Shifting Dominoes
data structures
,
geometry
,
graphs
,
trees
3200
x157
1284F
New Year and Social Network
data structures
,
graph matchings
,
graphs
,
math
,
trees
3200
x158
1396E
Distance Matching
constructive algorithms
,
dfs and similar
,
trees
3200
x182
1019E
Raining season
data structures
,
divide and conquer
,
trees
3200
x185
840E
In a Trap
trees
3200
x199
578F
Mirror Box
matrices
,
trees
3200
x255
786E
ALT
data structures
,
flows
,
graphs
,
trees
3200
x287
566E
Restoring Map
bitmasks
,
constructive algorithms
,
trees
3200
x300
650E
Clockwork Bomb
data structures
,
dfs and similar
,
dsu
,
greedy
,
trees
3200
x364
487E
Tourists
data structures
,
dfs and similar
,
graphs
,
trees
3200
x795
1211H
Road Repair in Treeland
*special problem
,
binary search
,
dp
,
trees
3100
x27
891D
Sloth
dfs and similar
,
dp
,
graph matchings
,
trees
3100
x86
1344E
Train Tracks
data structures
,
trees
3100
x92
960H
Santa's Gift
data structures
,
trees
3100
x104
830E
Perpetual Motion Machine
constructive algorithms
,
dp
,
graphs
,
implementation
,
math
,
trees
3100
x128
1481F
AB Tree
dp
,
greedy
,
trees
3100
x168
536E
Tavas on the Path
data structures
,
divide and conquer
,
trees
3100
x218
1129E
Legendary Tree
binary search
,
interactive
,
trees
3100
x226
1383C
String Transformation 2
bitmasks
,
dp
,
graphs
,
trees
3100
x264
1110G
Tree-Tac-Toe
constructive algorithms
,
games
,
trees
3100
x298
571D
Campus
binary search
,
data structures
,
dsu
,
trees
3100
x349
809E
Surprise me!
divide and conquer
,
math
,
number theory
,
trees
3100
x380
176E
Archaeology
data structures
,
dfs and similar
,
trees
3100
x506
251E
Tree and Table
dfs and similar
,
dp
,
implementation
,
trees
3000
x86
331D3
Escaping on Beaveractor
data structures
,
implementation
,
trees
3000
x115
1252D
Find String in a Grid
data structures
,
dp
,
strings
,
trees
3000
x159
434E
Furukawa Nagisa's Tree
binary search
,
divide and conquer
,
sortings
,
trees
3000
x162
1168D
Anagram Paths
dp
,
implementation
,
trees
3000
x178
533A
Berland Miners
binary search
,
data structures
,
dfs and similar
,
greedy
,
trees
3000
x188
1442E
Black, White and Grey Tree
binary search
,
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
3000
x211
1299D
Around the World
bitmasks
,
combinatorics
,
dfs and similar
,
dp
,
graphs
,
math
,
trees
3000
x222
1381D
The Majestic Brown Tree Snake
dfs and similar
,
dp
,
greedy
,
trees
,
two pointers
3000
x230
1361E
James and the Chase
dfs and similar
,
graphs
,
probabilities
,
trees
3000
x234
1438F
Olha and Igor
interactive
,
probabilities
,
trees
3000
x246
696E
...Wait for it...
data structures
,
dsu
,
trees
3000
x291
1097G
Vladislav and a Great Legend
combinatorics
,
dp
,
trees
3000
x298
566C
Logistical Questions
dfs and similar
,
divide and conquer
,
trees
3000
x332
1320E
Treeland and Viruses
data structures
,
dfs and similar
,
dp
,
shortest paths
,
trees
3000
x334
150E
Freezing with Style
binary search
,
data structures
,
divide and conquer
,
trees
3000
x345
504E
Misha and LCP on Tree
binary search
,
dfs and similar
,
hashing
,
string suffix structures
,
trees
3000
x401
603E
Pastoral Oddities
data structures
,
divide and conquer
,
dsu
,
math
,
trees
3000
x433
871E
Restore the Tree
graphs
,
greedy
,
trees
2900
x79
980F
Cactus to Tree
dp
,
graphs
,
trees
2900
x85
403E
Two Rooted Trees
data structures
,
implementation
,
trees
2900
x136
793E
Problem of offices
constructive algorithms
,
dfs and similar
,
dp
,
trees
2900
x163
117E
Tree or not Tree
data structures
,
divide and conquer
,
implementation
,
trees
2900
x164
1361D
Johnny and James
greedy
,
implementation
,
math
,
trees
2900
x209
1276D
Tree Elimination
dp
,
trees
2900
x211
925E
May Holidays
data structures
,
trees
2900
x220
718D
Andrew and Chemistry
dp
,
hashing
,
trees
2900
x261
997D
Cycles in product
combinatorics
,
divide and conquer
,
trees
2900
x271
1055F
Tree and XOR
strings
,
trees
2900
x286
763D
Timofey and a flat tree
data structures
,
graphs
,
hashing
,
shortest paths
,
trees
2900
x303
226E
Noble Knight's Path
data structures
,
trees
2900
x320
1479D
Odd Mineral Resource
binary search
,
bitmasks
,
brute force
,
data structures
,
probabilities
,
trees
2900
x339
343E
Pumping Stations
brute force
,
dfs and similar
,
divide and conquer
,
flows
,
graphs
,
greedy
,
trees
2900
x340
1083C
Max Mex
data structures
,
trees
2900
x454
512D
Fox And Travelling
dp
,
trees
2900
x522
741D
Arpa’s letter-marked tree and Mehrdad’s Dokhtar-kosh paths
data structures
,
dfs and similar
,
trees
2900
x1095
962G
Visible Black Areas
data structures
,
dsu
,
geometry
,
trees
2800
x74
762F
Tree nesting
combinatorics
,
graphs
,
trees
2800
x149
1379E
Inverse Genealogy
constructive algorithms
,
divide and conquer
,
dp
,
math
,
trees
2800
x189
842E
Nikita and game
binary search
,
dfs and similar
,
divide and conquer
,
graphs
,
trees
2800
x192
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