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Before contest
Codeforces Round 941 (Div. 1)
3 days
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Before contest
Codeforces Round 941 (Div. 2)
3 days
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→ Filter Problems
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dsu
combine-tags-by-or
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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
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number theory
probabilities
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shortest paths
sortings
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strings
ternary search
trees
two pointers
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Problems
#
Name
1434E
A Convex Game
dsu
,
games
3500
x163
750H
New Year and Snowy Grid
dfs and similar
,
dsu
,
graphs
,
interactive
3500
x187
1804G
Flow Control
data structures
,
dsu
,
implementation
3500
x193
1305G
Kuroni and Antihype
bitmasks
,
brute force
,
dp
,
dsu
,
graphs
3500
x937
1844H
Multiple of Three Cycles
combinatorics
,
data structures
,
dp
,
dsu
,
math
3400
x127
936E
Iqea
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
shortest paths
,
trees
3400
x182
627F
Island Puzzle
dfs and similar
,
dsu
,
graphs
,
trees
3400
x229
1254E
Send Tree to Charlie
combinatorics
,
dfs and similar
,
dsu
,
trees
3300
x259
1556G
Gates to Another World
bitmasks
,
data structures
,
dsu
,
two pointers
3300
x304
1307F
Cow and Vacation
dfs and similar
,
dsu
,
trees
3300
x565
1648E
Air Reform
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
implementation
,
trees
3200
x382
650E
Clockwork Bomb
data structures
,
dfs and similar
,
dsu
,
greedy
,
trees
3200
x585
1740G
Dangerous Laser Power
constructive algorithms
,
dsu
,
sortings
3100
x177
1012E
Cycle sort
dsu
,
math
3100
x268
1948G
MST with Matching
bitmasks
,
brute force
,
dsu
,
graph matchings
,
trees
3100
x566
571D
Campus
binary search
,
data structures
,
dsu
,
trees
3100
x647
1628E
Groceries in Meteor Town
binary search
,
data structures
,
dsu
,
trees
3100
x821
896E
Welcome home, Chtholly
data structures
,
dsu
3100
x1960
1956F
Nene and the Passing Game
constructive algorithms
,
data structures
,
dsu
,
graphs
,
sortings
3000
x203
1797F
Li Hua and Path
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
trees
3000
x326
1920F2
Smooth Sailing (Hard Version)
binary search
,
data structures
,
dsu
,
geometry
,
graphs
,
trees
3000
x392
1763F
Edge Queries
data structures
,
dfs and similar
,
dp
,
dsu
,
graphs
,
trees
3000
x417
1801E
Gasoline prices
data structures
,
divide and conquer
,
dsu
,
hashing
,
trees
3000
x432
696E
...Wait for it...
data structures
,
dsu
,
trees
3000
x475
603E
Pastoral Oddities
data structures
,
divide and conquer
,
dsu
,
math
,
trees
3000
x1148
1468B
Bakery
data structures
,
dsu
2900
x198
1051G
Distinctification
data structures
,
dsu
,
greedy
2900
x358
763E
Timofey and our friends animals
data structures
,
divide and conquer
,
dsu
2900
x475
325D
Reclamation
dsu
2900
x484
1687D
Cute number
binary search
,
brute force
,
data structures
,
dsu
,
implementation
,
math
2900
x556
938G
Shortest Path Queries
bitmasks
,
data structures
,
dsu
,
graphs
2900
x854
19E
Fairy
dfs and similar
,
divide and conquer
,
dsu
2900
x1593
962G
Visible Black Areas
data structures
,
dsu
,
geometry
,
trees
2800
x125
1725I
Imitating the Key Tree
combinatorics
,
dsu
,
trees
2800
x183
217E
Alien DNA
data structures
,
dsu
,
trees
2800
x290
1578B
Building Forest Trails
data structures
,
dsu
2800
x321
461D
Appleman and Complicated Task
dsu
,
math
2800
x355
1935F
Andrey's Tree
binary search
,
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
implementation
,
trees
2800
x370
1685D1
Permutation Weight (Easy Version)
constructive algorithms
,
dfs and similar
,
dsu
2800
x419
1386C
Joker
*special problem
,
bitmasks
,
data structures
,
divide and conquer
,
dsu
2800
x427
1419F
Rain of Fire
binary search
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
implementation
2800
x474
1303F
Number of Components
dsu
,
implementation
2800
x510
325E
The Red Button
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
greedy
2800
x742
516D
Drazil and Morning Exercise
dfs and similar
,
dp
,
dsu
,
trees
,
two pointers
2800
x1222
471E
MUH and Lots and Lots of Segments
data structures
,
dsu
2700
x80
105D
Entertaining Geodetics
brute force
,
dsu
,
implementation
2700
x135
81E
Pairs
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
trees
2700
x325
1814F
Communication Towers
brute force
,
divide and conquer
,
dsu
2700
x450
1574F
Occurrences
combinatorics
,
dfs and similar
,
dp
,
dsu
,
fft
,
graphs
2700
x571
1550F
Jumping Around
binary search
,
data structures
,
divide and conquer
,
dp
,
dsu
,
graphs
,
shortest paths
2700
x627
1567F
One-Four Overload
2-sat
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
implementation
2700
x727
444E
DZY Loves Planting
binary search
,
dsu
,
trees
2700
x742
1887D
Split
binary search
,
data structures
,
divide and conquer
,
dsu
,
math
,
trees
,
two pointers
2700
x797
1555F
Good Graph
data structures
,
dsu
,
graphs
,
trees
2700
x827
1408G
Clusterization Counting
combinatorics
,
dp
,
dsu
,
fft
,
graphs
,
trees
2700
x920
1553G
Common Divisor Graph
brute force
,
constructive algorithms
,
dsu
,
graphs
,
hashing
,
math
,
number theory
2700
x970
715C
Digit Tree
dfs and similar
,
divide and conquer
,
dsu
,
trees
2700
x1905
13E
Holes
data structures
,
dsu
2700
x5325
374E
Inna and Babies
binary search
,
data structures
,
dsu
,
geometry
,
implementation
2600
x178
36E
Two Paths
constructive algorithms
,
dsu
,
graphs
,
implementation
2600
x491
1217F
Forced Online Queries Problem
data structures
,
divide and conquer
,
dsu
,
graphs
,
trees
2600
x538
1657F
Words on Tree
2-sat
,
dfs and similar
,
dsu
,
graphs
,
trees
2600
x544
1680F
Lenient Vertex Cover
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
trees
2600
x626
196E
Opening Portals
dsu
,
graphs
,
shortest paths
2600
x826
811E
Vladik and Entertaining Flags
data structures
,
dsu
,
graphs
2600
x834
1696F
Tree Recovery
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
trees
2600
x840
1023F
Mobile Phone Network
dfs and similar
,
dsu
,
graphs
,
trees
2600
x857
1400G
Mercenaries
bitmasks
,
brute force
,
combinatorics
,
dp
,
dsu
,
math
,
two pointers
2600
x891
85E
Guard Towers
binary search
,
dsu
,
geometry
,
graphs
,
sortings
2600
x904
1140F
Extending Set of Points
data structures
,
divide and conquer
,
dsu
2600
x1109
1515F
Phoenix and Earthquake
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
trees
2600
x1679
1416D
Graph and Queries
data structures
,
dsu
,
graphs
,
implementation
,
trees
2600
x1825
60D
Savior
brute force
,
dsu
,
math
2500
x394
212D
Cutting a Fence
binary search
,
data structures
,
dsu
2500
x451
1423H
Virus
data structures
,
divide and conquer
,
dsu
,
graphs
2500
x506
1725K
Kingdom of Criticism
data structures
,
dsu
2500
x575
1236E
Alice and the Unfair Game
binary search
,
data structures
,
dp
,
dsu
2500
x634
884E
Binary Matrix
dsu
2500
x668
1758E
Tick, Tock
combinatorics
,
dfs and similar
,
dsu
,
graphs
2500
x774
1788F
XOR, Tree, and Queries
bitmasks
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
trees
2500
x780
1876D
Lexichromatography
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
two pointers
2500
x803
1806D
DSU Master
combinatorics
,
dp
,
dsu
,
math
2500
x838
778C
Peterson Polyglot
brute force
,
dfs and similar
,
dsu
,
hashing
,
strings
,
trees
2500
x847
687D
Dividing Kingdom II
brute force
,
data structures
,
dsu
,
graphs
,
sortings
2500
x849
1920F1
Smooth Sailing (Easy Version)
binary search
,
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
shortest paths
2500
x866
1764F
Doremy's Experimental Tree
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
sortings
,
trees
2500
x875
1661E
Narrow Components
brute force
,
data structures
,
dp
,
dsu
,
math
,
trees
2500
x910
1689E
ANDfinity
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2500
x1145
813F
Bipartite Checking
data structures
,
dsu
,
graphs
2500
x1210
1824C
LuoTianyi and XOR-Tree
data structures
,
dfs and similar
,
dp
,
dsu
,
greedy
,
trees
2500
x1235
875F
Royal Questions
dsu
,
graphs
,
greedy
2500
x1242
1120D
Power Tree
dfs and similar
,
dp
,
dsu
,
graphs
,
greedy
,
trees
2500
x1258
1687C
Sanae and Giant Robot
binary search
,
brute force
,
data structures
,
dsu
,
greedy
,
sortings
2500
x1335
1361C
Johnny and Megan's Necklace
binary search
,
bitmasks
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2500
x1378
95E
Lucky Country
dp
,
dsu
,
graphs
2500
x1380
1508C
Complete the MST
bitmasks
,
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
trees
2500
x1417
1444C
Team-Building
data structures
,
dfs and similar
,
dsu
,
graphs
2500
x1453
1253F
Cheap Robot
binary search
,
dsu
,
graphs
,
shortest paths
,
trees
2500
x1574
1521D
Nastia Plays with a Tree
constructive algorithms
,
data structures
,
dfs and similar
,
dp
,
dsu
,
greedy
,
implementation
,
trees
2500
x1800
986C
AND Graph
bitmasks
,
dfs and similar
,
dsu
,
graphs
2500
x2183
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