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Before contest
Codeforces Round 941 (Div. 1)
15:41:40
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*has extra registration
Before contest
Codeforces Round 941 (Div. 2)
15:41:40
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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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Problems
#
Name
1942H
Farmer John's Favorite Intern
data structures
,
dp
,
flows
,
trees
3500
x54
1889F
Doremy's Average Tree
data structures
,
dp
,
greedy
,
trees
3500
x68
1863I
Redundant Routes
constructive algorithms
,
dp
,
trees
3500
x69
1326G
Spiderweb Trees
dp
,
geometry
,
trees
3500
x70
1863H
Goldberg Machine 3
dp
,
trees
3500
x71
1870H
Standard Graph Problem
data structures
,
graphs
,
greedy
,
trees
3500
x77
1889E
Doremy's Swapping Trees
dfs and similar
,
graphs
,
trees
3500
x84
1322F
Assigning Fares
dp
,
trees
3500
x88
1761G
Centroid Guess
interactive
,
probabilities
,
trees
3500
x95
1876G
Clubstep
binary search
,
brute force
,
data structures
,
greedy
,
trees
3500
x116
1824E
LuoTianyi and Cartridge
data structures
,
trees
3500
x124
1444E
Finding the Vertex
brute force
,
dfs and similar
,
dp
,
interactive
,
trees
3500
x130
1423C
Dušan's Railway
divide and conquer
,
graphs
,
trees
3500
x130
1916G
Optimizations From Chelsu
divide and conquer
,
dp
,
number theory
,
trees
3500
x132
1208H
Red Blue Tree
data structures
,
implementation
,
trees
3500
x141
1534H
Lost Nodes
constructive algorithms
,
dp
,
graphs
,
interactive
,
sortings
,
trees
3500
x143
1608G
Alphabetic Tree
binary search
,
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
3500
x147
1621H
Trains and Airplanes
dfs and similar
,
graphs
,
shortest paths
,
trees
3500
x161
1919G
Tree LGM
constructive algorithms
,
divide and conquer
,
games
,
trees
3500
x167
1053E
Euler tour
constructive algorithms
,
trees
3500
x193
1336F
Journey
data structures
,
divide and conquer
,
graphs
,
trees
3500
x194
1439E
Cheat and Win
bitmasks
,
data structures
,
games
,
trees
3500
x214
1450G
Communism
bitmasks
,
dp
,
trees
3500
x231
1458F
Range Diameter Sum
data structures
,
trees
3500
x258
1464F
My Beautiful Madness
data structures
,
trees
3500
x273
1023G
Pisces
data structures
,
flows
,
trees
3400
x112
917E
Upside Down
data structures
,
string suffix structures
,
strings
,
trees
3400
x121
786D
Rap God
data structures
,
dfs and similar
,
hashing
,
strings
,
trees
3400
x136
1158E
Strange device
binary search
,
interactive
,
math
,
trees
3400
x147
936E
Iqea
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
shortest paths
,
trees
3400
x182
1010F
Tree
fft
,
graphs
,
trees
3400
x209
914H
Ember and Storm's Tree Game
combinatorics
,
dp
,
games
,
trees
3400
x226
627F
Island Puzzle
dfs and similar
,
dsu
,
graphs
,
trees
3400
x231
1827E
Bus Routes
binary search
,
constructive algorithms
,
dfs and similar
,
greedy
,
trees
3400
x356
1710D
Recover the Tree
constructive algorithms
,
trees
3400
x405
1482H
Exam
data structures
,
string suffix structures
,
trees
3400
x422
1137F
Matches Are Not a Child's Play
data structures
,
trees
3400
x456
757G
Can Bash Save the Day?
data structures
,
divide and conquer
,
graphs
,
trees
3400
x478
1119F
Niyaz and Small Degrees
data structures
,
dp
,
trees
3400
x647
1491H
Yuezheng Ling and Dynamic Tree
data structures
,
trees
3400
x759
1930H
Interactive Mex Tree
constructive algorithms
,
dfs and similar
,
interactive
,
trees
3300
x118
855G
Harry Vs Voldemort
dfs and similar
,
dp
,
graphs
,
trees
3300
x199
1740H
MEX Tree Manipulation
data structures
,
trees
3300
x201
1876E
Ball-Stackable
constructive algorithms
,
data structures
,
dp
,
trees
3300
x215
1254E
Send Tree to Charlie
combinatorics
,
dfs and similar
,
dsu
,
trees
3300
x259
704E
Iron Man
data structures
,
geometry
,
trees
3300
x272
1495F
Squares
constructive algorithms
,
data structures
,
dp
,
graphs
,
trees
3300
x279
1718D
Permutation for Burenka
data structures
,
graph matchings
,
greedy
,
math
,
trees
3300
x286
1583H
Omkar and Tours
data structures
,
divide and conquer
,
sortings
,
trees
3300
x313
639F
Bear and Chemistry
data structures
,
dfs and similar
,
graphs
,
trees
3300
x394
1307F
Cow and Vacation
dfs and similar
,
dsu
,
trees
3300
x565
526G
Spiders Evil Plan
greedy
,
trees
3300
x689
690F3
Tree of Life (hard)
trees
3200
x45
923F
Public Service
constructive algorithms
,
graphs
,
trees
3200
x72
457F
An easy problem about trees
dp
,
games
,
greedy
,
trees
3200
x103
772E
Verifying Kingdom
binary search
,
divide and conquer
,
interactive
,
trees
3200
x122
500G
New Year Running
number theory
,
trees
3200
x155
482E
ELCA
data structures
,
trees
3200
x175
1951H
Thanos Snap
binary search
,
dp
,
games
,
greedy
,
trees
3200
x177
1781G
Diverse Coloring
constructive algorithms
,
trees
3200
x213
1819E
Roads in E City
interactive
,
math
,
probabilities
,
trees
3200
x241
1007D
Ants
2-sat
,
data structures
,
trees
3200
x256
1109F
Sasha and Algorithm of Silence's Sounds
data structures
,
trees
3200
x278
1427F
Boring Card Game
data structures
,
greedy
,
trees
3200
x302
1712F
Triameter
binary search
,
data structures
,
dfs and similar
,
trees
3200
x303
1284F
New Year and Social Network
data structures
,
graph matchings
,
graphs
,
math
,
trees
3200
x306
1396E
Distance Matching
constructive algorithms
,
dfs and similar
,
trees
3200
x319
1019E
Raining season
data structures
,
divide and conquer
,
trees
3200
x326
1774G
Segment Covering
brute force
,
combinatorics
,
constructive algorithms
,
data structures
,
dp
,
trees
3200
x363
1859F
Teleportation in Byteland
data structures
,
dfs and similar
,
divide and conquer
,
graphs
,
shortest paths
,
trees
3200
x365
1648E
Air Reform
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
implementation
,
trees
3200
x383
1368G
Shifting Dominoes
data structures
,
geometry
,
graphs
,
trees
3200
x396
840E
In a Trap
trees
3200
x432
1517F
Reunion
combinatorics
,
dp
,
trees
3200
x435
578F
Mirror Box
matrices
,
trees
3200
x529
650E
Clockwork Bomb
data structures
,
dfs and similar
,
dsu
,
greedy
,
trees
3200
x585
566E
Restoring Map
bitmasks
,
constructive algorithms
,
trees
3200
x600
786E
ALT
data structures
,
flows
,
graphs
,
trees
3200
x601
487E
Tourists
data structures
,
dfs and similar
,
graphs
,
trees
3200
x2114
1211H
Road Repair in Treeland
*special problem
,
binary search
,
dp
,
trees
3100
x41
891D
Sloth
dfs and similar
,
dp
,
graph matchings
,
trees
3100
x169
1930G
Prefix Max Set Counting
data structures
,
dp
,
trees
3100
x242
1767F
Two Subtrees
data structures
,
trees
3100
x245
960H
Santa's Gift
data structures
,
trees
3100
x253
1610I
Mashtali vs AtCoder
games
,
trees
3100
x256
1344E
Train Tracks
data structures
,
trees
3100
x267
830E
Perpetual Motion Machine
constructive algorithms
,
dp
,
graphs
,
implementation
,
math
,
trees
3100
x272
1508E
Tree Calendar
brute force
,
constructive algorithms
,
data structures
,
dfs and similar
,
sortings
,
trees
3100
x326
1129E
Legendary Tree
binary search
,
interactive
,
trees
3100
x369
536E
Tavas on the Path
data structures
,
divide and conquer
,
trees
3100
x371
1610H
Squid Game
data structures
,
dfs and similar
,
greedy
,
trees
3100
x395
1481F
AB Tree
dp
,
greedy
,
trees
3100
x451
1383C
String Transformation 2
bitmasks
,
dp
,
graphs
,
trees
3100
x557
1110G
Tree-Tac-Toe
constructive algorithms
,
games
,
trees
3100
x574
1948G
MST with Matching
bitmasks
,
brute force
,
dsu
,
graph matchings
,
trees
3100
x579
571D
Campus
binary search
,
data structures
,
dsu
,
trees
3100
x647
809E
Surprise me!
divide and conquer
,
math
,
number theory
,
trees
3100
x714
1628E
Groceries in Meteor Town
binary search
,
data structures
,
dsu
,
trees
3100
x822
176E
Archaeology
data structures
,
dfs and similar
,
trees
3100
x1019
331D3
Escaping on Beaveractor
data structures
,
implementation
,
trees
3000
x168
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