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Codeforces Round 940 (Div. 2) and CodeCraft-23
3 days
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*has extra registration
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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
1942H
Farmer John's Favorite Intern
data structures
,
dp
,
flows
,
trees
3500
x52
1863I
Redundant Routes
constructive algorithms
,
dp
,
trees
3500
x66
1889F
Doremy's Average Tree
data structures
,
dp
,
greedy
,
trees
3500
x67
1863H
Goldberg Machine 3
dp
,
trees
3500
x69
1326G
Spiderweb Trees
dp
,
geometry
,
trees
3500
x69
1870H
Standard Graph Problem
data structures
,
graphs
,
greedy
,
trees
3500
x76
1889E
Doremy's Swapping Trees
dfs and similar
,
graphs
,
trees
3500
x84
1322F
Assigning Fares
dp
,
trees
3500
x87
1761G
Centroid Guess
interactive
,
probabilities
,
trees
3500
x95
1876G
Clubstep
binary search
,
brute force
,
data structures
,
greedy
,
trees
3500
x114
1824E
LuoTianyi and Cartridge
data structures
,
trees
3500
x123
1444E
Finding the Vertex
brute force
,
dfs and similar
,
dp
,
interactive
,
trees
3500
x129
1423C
Dušan's Railway
divide and conquer
,
graphs
,
trees
3500
x129
1916G
Optimizations From Chelsu
divide and conquer
,
dp
,
number theory
,
trees
3500
x131
1208H
Red Blue Tree
data structures
,
implementation
,
trees
3500
x140
1534H
Lost Nodes
constructive algorithms
,
dp
,
graphs
,
interactive
,
sortings
,
trees
3500
x142
1608G
Alphabetic Tree
binary search
,
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
3500
x146
1621H
Trains and Airplanes
dfs and similar
,
graphs
,
shortest paths
,
trees
3500
x160
1919G
Tree LGM
constructive algorithms
,
divide and conquer
,
games
,
trees
3500
x162
1053E
Euler tour
constructive algorithms
,
trees
3500
x192
1336F
Journey
data structures
,
divide and conquer
,
graphs
,
trees
3500
x193
1439E
Cheat and Win
bitmasks
,
data structures
,
games
,
trees
3500
x213
1450G
Communism
bitmasks
,
dp
,
trees
3500
x226
1458F
Range Diameter Sum
data structures
,
trees
3500
x257
1464F
My Beautiful Madness
data structures
,
trees
3500
x270
1023G
Pisces
data structures
,
flows
,
trees
3400
x111
917E
Upside Down
data structures
,
string suffix structures
,
strings
,
trees
3400
x119
786D
Rap God
data structures
,
dfs and similar
,
hashing
,
strings
,
trees
3400
x133
1158E
Strange device
binary search
,
interactive
,
math
,
trees
3400
x146
936E
Iqea
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
shortest paths
,
trees
3400
x181
1010F
Tree
fft
,
graphs
,
trees
3400
x206
914H
Ember and Storm's Tree Game
combinatorics
,
dp
,
games
,
trees
3400
x225
627F
Island Puzzle
dfs and similar
,
dsu
,
graphs
,
trees
3400
x228
1827E
Bus Routes
binary search
,
constructive algorithms
,
dfs and similar
,
greedy
,
trees
3400
x355
1710D
Recover the Tree
constructive algorithms
,
trees
3400
x404
1482H
Exam
data structures
,
string suffix structures
,
trees
3400
x420
1137F
Matches Are Not a Child's Play
data structures
,
trees
3400
x427
757G
Can Bash Save the Day?
data structures
,
divide and conquer
,
graphs
,
trees
3400
x476
1119F
Niyaz and Small Degrees
data structures
,
dp
,
trees
3400
x645
1491H
Yuezheng Ling and Dynamic Tree
data structures
,
trees
3400
x756
1930H
Interactive Mex Tree
constructive algorithms
,
dfs and similar
,
interactive
,
trees
3300
x111
1740H
MEX Tree Manipulation
data structures
,
trees
3300
x198
855G
Harry Vs Voldemort
dfs and similar
,
dp
,
graphs
,
trees
3300
x198
1876E
Ball-Stackable
constructive algorithms
,
data structures
,
dp
,
trees
3300
x213
1254E
Send Tree to Charlie
combinatorics
,
dfs and similar
,
dsu
,
trees
3300
x258
704E
Iron Man
data structures
,
geometry
,
trees
3300
x271
1495F
Squares
constructive algorithms
,
data structures
,
dp
,
graphs
,
trees
3300
x274
1718D
Permutation for Burenka
data structures
,
graph matchings
,
greedy
,
math
,
trees
3300
x284
1583H
Omkar and Tours
data structures
,
divide and conquer
,
sortings
,
trees
3300
x312
639F
Bear and Chemistry
data structures
,
dfs and similar
,
graphs
,
trees
3300
x392
1307F
Cow and Vacation
dfs and similar
,
dsu
,
trees
3300
x562
526G
Spiders Evil Plan
greedy
,
trees
3300
x687
690F3
Tree of Life (hard)
trees
3200
x44
923F
Public Service
constructive algorithms
,
graphs
,
trees
3200
x71
457F
An easy problem about trees
dp
,
games
,
greedy
,
trees
3200
x102
772E
Verifying Kingdom
binary search
,
divide and conquer
,
interactive
,
trees
3200
x121
500G
New Year Running
number theory
,
trees
3200
x154
1951H
Thanos Snap
binary search
,
dp
,
games
,
greedy
,
trees
3200
x161
482E
ELCA
data structures
,
trees
3200
x174
1781G
Diverse Coloring
constructive algorithms
,
trees
3200
x212
1819E
Roads in E City
interactive
,
math
,
probabilities
,
trees
3200
x239
1007D
Ants
2-sat
,
data structures
,
trees
3200
x254
1109F
Sasha and Algorithm of Silence's Sounds
data structures
,
trees
3200
x277
1427F
Boring Card Game
data structures
,
greedy
,
trees
3200
x299
1712F
Triameter
binary search
,
data structures
,
dfs and similar
,
trees
3200
x300
1284F
New Year and Social Network
data structures
,
graph matchings
,
graphs
,
math
,
trees
3200
x305
1396E
Distance Matching
constructive algorithms
,
dfs and similar
,
trees
3200
x318
1019E
Raining season
data structures
,
divide and conquer
,
trees
3200
x324
1774G
Segment Covering
brute force
,
combinatorics
,
constructive algorithms
,
data structures
,
dp
,
trees
3200
x357
1859F
Teleportation in Byteland
data structures
,
dfs and similar
,
divide and conquer
,
graphs
,
shortest paths
,
trees
3200
x359
1648E
Air Reform
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
implementation
,
trees
3200
x380
1368G
Shifting Dominoes
data structures
,
geometry
,
graphs
,
trees
3200
x395
840E
In a Trap
trees
3200
x430
1517F
Reunion
combinatorics
,
dp
,
trees
3200
x434
578F
Mirror Box
matrices
,
trees
3200
x527
650E
Clockwork Bomb
data structures
,
dfs and similar
,
dsu
,
greedy
,
trees
3200
x583
786E
ALT
data structures
,
flows
,
graphs
,
trees
3200
x598
566E
Restoring Map
bitmasks
,
constructive algorithms
,
trees
3200
x599
487E
Tourists
data structures
,
dfs and similar
,
graphs
,
trees
3200
x2109
1211H
Road Repair in Treeland
*special problem
,
binary search
,
dp
,
trees
3100
x41
891D
Sloth
dfs and similar
,
dp
,
graph matchings
,
trees
3100
x168
1930G
Prefix Max Set Counting
data structures
,
dp
,
trees
3100
x212
1767F
Two Subtrees
data structures
,
trees
3100
x244
960H
Santa's Gift
data structures
,
trees
3100
x252
1610I
Mashtali vs AtCoder
games
,
trees
3100
x254
1344E
Train Tracks
data structures
,
trees
3100
x266
830E
Perpetual Motion Machine
constructive algorithms
,
dp
,
graphs
,
implementation
,
math
,
trees
3100
x271
1508E
Tree Calendar
brute force
,
constructive algorithms
,
data structures
,
dfs and similar
,
sortings
,
trees
3100
x323
1129E
Legendary Tree
binary search
,
interactive
,
trees
3100
x367
536E
Tavas on the Path
data structures
,
divide and conquer
,
trees
3100
x368
1610H
Squid Game
data structures
,
dfs and similar
,
greedy
,
trees
3100
x391
1481F
AB Tree
dp
,
greedy
,
trees
3100
x449
1383C
String Transformation 2
bitmasks
,
dp
,
graphs
,
trees
3100
x555
1948G
MST with Matching
bitmasks
,
brute force
,
dsu
,
graph matchings
,
trees
3100
x557
1110G
Tree-Tac-Toe
constructive algorithms
,
games
,
trees
3100
x572
571D
Campus
binary search
,
data structures
,
dsu
,
trees
3100
x646
809E
Surprise me!
divide and conquer
,
math
,
number theory
,
trees
3100
x710
1628E
Groceries in Meteor Town
binary search
,
data structures
,
dsu
,
trees
3100
x820
176E
Archaeology
data structures
,
dfs and similar
,
trees
3100
x1010
331D3
Escaping on Beaveractor
data structures
,
implementation
,
trees
3000
x167
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