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Before contest
Codeforces Round #793 (Div. 2)
3 days
→ Filter Problems
Difficulty:
—
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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Problems
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Status
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Custom test
Problems
#
Name
1434E
A Convex Game
dsu
,
games
3500
x83
750H
New Year and Snowy Grid
dfs and similar
,
dsu
,
graphs
,
interactive
3500
x123
1305G
Kuroni and Antihype
bitmasks
,
brute force
,
dp
,
dsu
,
graphs
3500
x481
936E
Iqea
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
shortest paths
,
trees
3400
x147
627F
Island Puzzle
dfs and similar
,
dsu
,
graphs
,
trees
3400
x158
1556G
Gates to Another World
bitmasks
,
data structures
,
dsu
,
two pointers
3300
x172
1254E
Send Tree to Charlie
combinatorics
,
dfs and similar
,
dsu
,
trees
3300
x189
1307F
Cow and Vacation
dfs and similar
,
dsu
,
trees
3300
x351
1648E
Air Reform
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
implementation
,
trees
3200
x181
650E
Clockwork Bomb
data structures
,
dfs and similar
,
dsu
,
greedy
,
trees
3200
x423
1012E
Cycle sort
dsu
,
math
3100
x185
1628E
Groceries in Meteor Town
binary search
,
data structures
,
dsu
,
trees
3100
x367
571D
Campus
binary search
,
data structures
,
dsu
,
trees
3100
x482
896E
Welcome home, Chtholly
data structures
,
dsu
3100
x929
696E
...Wait for it...
data structures
,
dsu
,
trees
3000
x340
603E
Pastoral Oddities
data structures
,
divide and conquer
,
dsu
,
math
,
trees
3000
x641
1468B
Bakery
data structures
,
dsu
2900
x144
1051G
Distinctification
data structures
,
dsu
,
greedy
2900
x198
763E
Timofey and our friends animals
data structures
,
divide and conquer
,
dsu
2900
x367
325D
Reclamation
dsu
2900
x397
938G
Shortest Path Queries
bitmasks
,
data structures
,
dsu
,
graphs
2900
x527
19E
Fairy
dfs and similar
,
divide and conquer
,
dsu
2900
x1125
962G
Visible Black Areas
data structures
,
dsu
,
geometry
,
trees
2800
x94
1578B
Building Forest Trails
data structures
,
dsu
2800
x234
217E
Alien DNA
data structures
,
dsu
,
trees
2800
x235
1386C
Joker
*special problem
,
bitmasks
,
data structures
,
divide and conquer
,
dsu
2800
x255
461D
Appleman and Complicated Task
dsu
,
math
2800
x302
1419F
Rain of Fire
binary search
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
implementation
2800
x392
1303F
Number of Components
dsu
,
implementation
2800
x400
325E
The Red Button
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
greedy
2800
x588
516D
Drazil and Morning Exercise
dfs and similar
,
dp
,
dsu
,
trees
,
two pointers
2800
x943
471E
MUH and Lots and Lots of Segments
data structures
,
dsu
2700
x62
105D
Entertaining Geodetics
brute force
,
dsu
,
implementation
2700
x113
81E
Pairs
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
trees
2700
x223
1574F
Occurrences
combinatorics
,
dfs and similar
,
dp
,
dsu
,
fft
,
graphs
2700
x418
1550F
Jumping Around
binary search
,
data structures
,
divide and conquer
,
dp
,
dsu
,
graphs
,
shortest paths
2700
x425
444E
DZY Loves Planting
binary search
,
dsu
,
trees
2700
x538
1567F
One-Four Overload
2-sat
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
implementation
2700
x562
1408G
Clusterization Counting
combinatorics
,
dp
,
dsu
,
fft
,
graphs
,
trees
2700
x594
1555F
Good Graph
data structures
,
dsu
,
graphs
,
trees
2700
x631
1553G
Common Divisor Graph
brute force
,
constructive algorithms
,
dsu
,
graphs
,
hashing
,
math
,
number theory
2700
x762
715C
Digit Tree
dfs and similar
,
divide and conquer
,
dsu
,
trees
2700
x1396
13E
Holes
data structures
,
dsu
2700
x3352
374E
Inna and Babies
binary search
,
data structures
,
dsu
,
geometry
,
implementation
2600
x158
1680F
Lenient Vertex Cover
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
trees
2600
x217
36E
Two Paths
constructive algorithms
,
dsu
,
graphs
,
implementation
2600
x315
1657F
Words on Tree
2-sat
,
dfs and similar
,
dsu
,
graphs
,
trees
2600
x354
1217F
Forced Online Queries Problem
data structures
,
divide and conquer
,
dsu
,
graphs
,
trees
2600
x364
196E
Opening Portals
dsu
,
graphs
,
shortest paths
2600
x582
811E
Vladik and Entertaining Flags
data structures
,
dsu
,
graphs
2600
x596
1140F
Extending Set of Points
data structures
,
divide and conquer
,
dsu
2600
x668
1023F
Mobile Phone Network
dfs and similar
,
dsu
,
graphs
,
trees
2600
x670
1400G
Mercenaries
bitmasks
,
brute force
,
combinatorics
,
dp
,
dsu
,
math
,
two pointers
2600
x680
85E
Guard Towers
binary search
,
dsu
,
geometry
,
graphs
,
sortings
2600
x697
1515F
Phoenix and Earthquake
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
trees
2600
x1206
1416D
Graph and Queries
data structures
,
dsu
,
graphs
,
implementation
,
trees
2600
x1250
60D
Savior
brute force
,
dsu
,
math
2500
x287
212D
Cutting a Fence
binary search
,
data structures
,
dsu
2500
x352
1423H
Virus
data structures
,
divide and conquer
,
dsu
,
graphs
2500
x364
1236E
Alice and the Unfair Game
binary search
,
data structures
,
dp
,
dsu
2500
x532
884E
Binary Matrix
dsu
2500
x542
1661E
Narrow Components
brute force
,
data structures
,
dp
,
dsu
,
math
,
trees
2500
x615
813F
Bipartite Checking
data structures
,
dsu
,
graphs
2500
x719
778C
Peterson Polyglot
brute force
,
dfs and similar
,
dsu
,
hashing
,
strings
,
trees
2500
x746
687D
Dividing Kingdom II
brute force
,
data structures
,
dsu
,
graphs
,
sortings
2500
x751
1120D
Power Tree
dfs and similar
,
dp
,
dsu
,
graphs
,
greedy
,
trees
2500
x764
875F
Royal Questions
dsu
,
graphs
,
greedy
2500
x960
95E
Lucky Country
dp
,
dsu
,
graphs
2500
x975
1253F
Cheap Robot
binary search
,
dsu
,
graphs
,
shortest paths
,
trees
2500
x1008
1508C
Complete the MST
bitmasks
,
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
trees
2500
x1014
1444C
Team-Building
data structures
,
dfs and similar
,
dsu
,
graphs
2500
x1095
1361C
Johnny and Megan's Necklace
binary search
,
bitmasks
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2500
x1137
1521D
Nastia Plays with a Tree
constructive algorithms
,
data structures
,
dfs and similar
,
dp
,
dsu
,
greedy
,
implementation
,
trees
2500
x1354
986C
AND Graph
bitmasks
,
dfs and similar
,
dsu
,
graphs
2500
x1706
1559D2
Mocha and Diana (Hard Version)
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
trees
,
two pointers
2500
x1957
1184E3
Daleks' Invasion (hard)
data structures
,
dsu
,
graphs
,
trees
2400
x363
209C
Trails and Glades
constructive algorithms
,
dsu
,
graphs
,
greedy
2400
x530
1166F
Vicky's Delivery Service
data structures
,
dsu
,
graphs
,
hashing
2400
x531
1044D
Deduction Queries
data structures
,
dsu
2400
x729
1578L
Labyrinth
binary search
,
dsu
,
greedy
2400
x764
452E
Three strings
data structures
,
dsu
,
string suffix structures
,
strings
2400
x794
1107G
Vasya and Maximum Profit
binary search
,
constructive algorithms
,
data structures
,
dp
,
dsu
2400
x811
601D
Acyclic Organic Compounds
data structures
,
dfs and similar
,
dsu
,
hashing
,
strings
,
trees
2400
x928
873F
Forbidden Indices
dsu
,
string suffix structures
,
strings
2400
x930
1042F
Leaf Sets
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
,
trees
2400
x1005
679C
Bear and Square Grid
dfs and similar
,
dsu
,
implementation
2400
x1060
1633E
Spanning Tree Queries
binary search
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
,
sortings
,
trees
2400
x1100
1027F
Session in BSU
binary search
,
dfs and similar
,
dsu
,
graph matchings
,
graphs
2400
x1123
653E
Bear and Forgotten Tree 2
dfs and similar
,
dsu
,
graphs
,
trees
2400
x1161
1463E
Plan of Lectures
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
2400
x1178
990G
GCD Counting
divide and conquer
,
dp
,
dsu
,
number theory
,
trees
2400
x1206
1290C
Prefix Enlightenment
dfs and similar
,
dsu
,
graphs
2400
x1236
506D
Mr. Kitayuta's Colorful Graph
brute force
,
dfs and similar
,
dsu
,
graphs
2400
x1471
915F
Imbalance Value of a Tree
data structures
,
dsu
,
graphs
,
trees
2400
x1549
1408E
Avoid Rainbow Cycles
data structures
,
dsu
,
graphs
,
greedy
,
sortings
,
trees
2400
x1578
46F
Hercule Poirot Problem
dsu
,
graphs
2300
x261
358E
Dima and Kicks
brute force
,
dsu
,
graphs
,
implementation
2300
x350
313E
Ilya and Two Numbers
constructive algorithms
,
data structures
,
dsu
,
greedy
2300
x481
141E
Clearing Up
constructive algorithms
,
dp
,
dsu
,
graphs
2300
x649
87D
Beautiful Road
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
2300
x711
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