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Codeforces Round 877 (Div. 2)
07:40:21
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Difficulty:
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dsu
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
1434E
A Convex Game
dsu
,
games
3500
x106
1804G
Flow Control
data structures
,
dsu
,
implementation
3500
x141
750H
New Year and Snowy Grid
dfs and similar
,
dsu
,
graphs
,
interactive
3500
x156
1305G
Kuroni and Antihype
bitmasks
,
brute force
,
dp
,
dsu
,
graphs
3500
x658
936E
Iqea
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
shortest paths
,
trees
3400
x164
627F
Island Puzzle
dfs and similar
,
dsu
,
graphs
,
trees
3400
x194
1556G
Gates to Another World
bitmasks
,
data structures
,
dsu
,
two pointers
3300
x220
1254E
Send Tree to Charlie
combinatorics
,
dfs and similar
,
dsu
,
trees
3300
x226
1307F
Cow and Vacation
dfs and similar
,
dsu
,
trees
3300
x407
1648E
Air Reform
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
implementation
,
trees
3200
x289
650E
Clockwork Bomb
data structures
,
dfs and similar
,
dsu
,
greedy
,
trees
3200
x471
1740G
Dangerous Laser Power
constructive algorithms
,
dsu
,
sortings
3100
x151
1012E
Cycle sort
dsu
,
math
3100
x245
571D
Campus
binary search
,
data structures
,
dsu
,
trees
3100
x555
1628E
Groceries in Meteor Town
binary search
,
data structures
,
dsu
,
trees
3100
x563
896E
Welcome home, Chtholly
data structures
,
dsu
3100
x1480
1797F
Li Hua and Path
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
trees
3000
x188
1801E
Gasoline prices
data structures
,
divide and conquer
,
dsu
,
hashing
,
trees
3000
x263
1763F
Edge Queries
data structures
,
dfs and similar
,
dp
,
dsu
,
graphs
,
trees
3000
x275
696E
...Wait for it...
data structures
,
dsu
,
trees
3000
x391
603E
Pastoral Oddities
data structures
,
divide and conquer
,
dsu
,
math
,
trees
3000
x920
1468B
Bakery
data structures
,
dsu
2900
x167
1051G
Distinctification
data structures
,
dsu
,
greedy
2900
x290
763E
Timofey and our friends animals
data structures
,
divide and conquer
,
dsu
2900
x427
325D
Reclamation
dsu
2900
x446
1687D
Cute number
binary search
,
brute force
,
data structures
,
dsu
,
implementation
,
math
2900
x466
938G
Shortest Path Queries
bitmasks
,
data structures
,
dsu
,
graphs
2900
x714
19E
Fairy
dfs and similar
,
divide and conquer
,
dsu
2900
x1346
962G
Visible Black Areas
data structures
,
dsu
,
geometry
,
trees
2800
x102
1725I
Imitating the Key Tree
combinatorics
,
dsu
,
trees
2800
x147
217E
Alien DNA
data structures
,
dsu
,
trees
2800
x253
1578B
Building Forest Trails
data structures
,
dsu
2800
x281
461D
Appleman and Complicated Task
dsu
,
math
2800
x323
1386C
Joker
*special problem
,
bitmasks
,
data structures
,
divide and conquer
,
dsu
2800
x327
1685D1
Permutation Weight (Easy Version)
constructive algorithms
,
dfs and similar
,
dsu
2800
x371
1419F
Rain of Fire
binary search
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
implementation
2800
x428
1303F
Number of Components
dsu
,
implementation
2800
x461
325E
The Red Button
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
greedy
2800
x630
516D
Drazil and Morning Exercise
dfs and similar
,
dp
,
dsu
,
trees
,
two pointers
2800
x1083
471E
MUH and Lots and Lots of Segments
data structures
,
dsu
2700
x71
105D
Entertaining Geodetics
brute force
,
dsu
,
implementation
2700
x123
81E
Pairs
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
trees
2700
x281
1814F
Communication Towers
brute force
,
divide and conquer
,
dsu
2700
x323
1550F
Jumping Around
binary search
,
data structures
,
divide and conquer
,
dp
,
dsu
,
graphs
,
shortest paths
2700
x500
1574F
Occurrences
combinatorics
,
dfs and similar
,
dp
,
dsu
,
fft
,
graphs
2700
x514
444E
DZY Loves Planting
binary search
,
dsu
,
trees
2700
x607
1567F
One-Four Overload
2-sat
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
implementation
2700
x633
1555F
Good Graph
data structures
,
dsu
,
graphs
,
trees
2700
x721
1408G
Clusterization Counting
combinatorics
,
dp
,
dsu
,
fft
,
graphs
,
trees
2700
x731
1553G
Common Divisor Graph
brute force
,
constructive algorithms
,
dsu
,
graphs
,
hashing
,
math
,
number theory
2700
x847
715C
Digit Tree
dfs and similar
,
divide and conquer
,
dsu
,
trees
2700
x1637
13E
Holes
data structures
,
dsu
2700
x4277
374E
Inna and Babies
binary search
,
data structures
,
dsu
,
geometry
,
implementation
2600
x166
36E
Two Paths
constructive algorithms
,
dsu
,
graphs
,
implementation
2600
x383
1680F
Lenient Vertex Cover
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
trees
2600
x427
1217F
Forced Online Queries Problem
data structures
,
divide and conquer
,
dsu
,
graphs
,
trees
2600
x427
1657F
Words on Tree
2-sat
,
dfs and similar
,
dsu
,
graphs
,
trees
2600
x441
811E
Vladik and Entertaining Flags
data structures
,
dsu
,
graphs
2600
x651
196E
Opening Portals
dsu
,
graphs
,
shortest paths
2600
x704
1696F
Tree Recovery
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
trees
2600
x756
1400G
Mercenaries
bitmasks
,
brute force
,
combinatorics
,
dp
,
dsu
,
math
,
two pointers
2600
x758
1023F
Mobile Phone Network
dfs and similar
,
dsu
,
graphs
,
trees
2600
x758
85E
Guard Towers
binary search
,
dsu
,
geometry
,
graphs
,
sortings
2600
x794
1140F
Extending Set of Points
data structures
,
divide and conquer
,
dsu
2600
x890
1515F
Phoenix and Earthquake
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
trees
2600
x1402
1416D
Graph and Queries
data structures
,
dsu
,
graphs
,
implementation
,
trees
2600
x1512
60D
Savior
brute force
,
dsu
,
math
2500
x318
212D
Cutting a Fence
binary search
,
data structures
,
dsu
2500
x379
1423H
Virus
data structures
,
divide and conquer
,
dsu
,
graphs
2500
x433
1725K
Kingdom of Criticism
data structures
,
dsu
2500
x440
1236E
Alice and the Unfair Game
binary search
,
data structures
,
dp
,
dsu
2500
x579
884E
Binary Matrix
dsu
2500
x596
1788F
XOR, Tree, and Queries
bitmasks
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
trees
2500
x616
1806D
DSU Master
combinatorics
,
dp
,
dsu
,
math
2500
x638
1758E
Tick, Tock
combinatorics
,
dfs and similar
,
dsu
,
graphs
2500
x646
1764F
Doremy's Experimental Tree
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
sortings
,
trees
2500
x760
778C
Peterson Polyglot
brute force
,
dfs and similar
,
dsu
,
hashing
,
strings
,
trees
2500
x791
687D
Dividing Kingdom II
brute force
,
data structures
,
dsu
,
graphs
,
sortings
2500
x801
1661E
Narrow Components
brute force
,
data structures
,
dp
,
dsu
,
math
,
trees
2500
x810
1824C
LuoTianyi and XOR-Tree
data structures
,
dfs and similar
,
dp
,
dsu
,
greedy
,
trees
2500
x812
813F
Bipartite Checking
data structures
,
dsu
,
graphs
2500
x971
1120D
Power Tree
dfs and similar
,
dp
,
dsu
,
graphs
,
greedy
,
trees
2500
x976
1689E
ANDfinity
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2500
x1020
875F
Royal Questions
dsu
,
graphs
,
greedy
2500
x1118
95E
Lucky Country
dp
,
dsu
,
graphs
2500
x1134
1508C
Complete the MST
bitmasks
,
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
trees
2500
x1180
1687C
Sanae and Giant Robot
binary search
,
brute force
,
data structures
,
dsu
,
greedy
,
sortings
2500
x1190
1253F
Cheap Robot
binary search
,
dsu
,
graphs
,
shortest paths
,
trees
2500
x1207
1444C
Team-Building
data structures
,
dfs and similar
,
dsu
,
graphs
2500
x1264
1361C
Johnny and Megan's Necklace
binary search
,
bitmasks
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2500
x1269
1521D
Nastia Plays with a Tree
constructive algorithms
,
data structures
,
dfs and similar
,
dp
,
dsu
,
greedy
,
implementation
,
trees
2500
x1553
986C
AND Graph
bitmasks
,
dfs and similar
,
dsu
,
graphs
2500
x1980
1559D2
Mocha and Diana (Hard Version)
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
trees
,
two pointers
2500
x2259
1184E3
Daleks' Invasion (hard)
data structures
,
dsu
,
graphs
,
trees
2400
x420
1780G
Delicious Dessert
binary search
,
dsu
,
hashing
,
math
,
number theory
,
string suffix structures
2400
x461
1765A
Access Levels
bitmasks
,
dsu
,
flows
,
graph matchings
2400
x541
209C
Trails and Glades
constructive algorithms
,
dsu
,
graphs
,
greedy
2400
x591
1166F
Vicky's Delivery Service
data structures
,
dsu
,
graphs
,
hashing
2400
x611
1044D
Deduction Queries
data structures
,
dsu
2400
x824
1107G
Vasya and Maximum Profit
binary search
,
constructive algorithms
,
data structures
,
dp
,
dsu
2400
x905
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