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Before contest
Codeforces Round #793 (Div. 2)
02:23:47
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Difficulty:
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data structures
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
1488J
Flower Shop
*special problem
,
data structures
,
fft
,
math
3100
x20
1297I
Falling Blocks
*special problem
,
data structures
x20
1545F
AquaMoon and Potatoes
brute force
,
data structures
,
dp
3500
x28
1346H
Game with Segments
*special problem
,
data structures
,
games
2700
x31
1648F
Two Avenues
data structures
,
dfs and similar
,
graphs
3500
x33
1599E
Two Arrays
data structures
,
matrices
3200
x35
1488H
Build From Suffixes
*special problem
,
combinatorics
,
data structures
2800
x36
1580E
Railway Construction
brute force
,
constructive algorithms
,
data structures
,
graphs
,
shortest paths
3400
x37
207C3
Game with Two Trees
data structures
2700
x40
1571I
Physical Examination
*special problem
,
binary search
,
data structures
3200
x42
1545E1
AquaMoon and Time Stop (easy version)
data structures
,
dp
3500
x42
1545E2
AquaMoon and Time Stop (hard version)
data structures
,
dp
3500
x43
1218B
Guarding warehouses
data structures
,
geometry
3000
x46
1491I
Ruler Of The Zoo
brute force
,
data structures
3500
x51
853E
Lada Malina
data structures
,
geometry
3400
x51
175F
Gnomes of Might and Magic
data structures
,
graphs
,
implementation
,
shortest paths
3000
x52
1571G
A Battle Against a Dragon
*special problem
,
data structures
,
dp
2500
x53
1672I
PermutationForces
data structures
,
greedy
3000
x56
1628F
Spaceship Crisis Management
binary search
,
data structures
,
geometry
,
sortings
3500
x57
471E
MUH and Lots and Lots of Segments
data structures
,
dsu
2700
x62
1060G
Balls and Pockets
data structures
3400
x64
1081H
Palindromic Magic
data structures
,
hashing
,
strings
3500
x67
1533H
Submatrices
*special problem
,
bitmasks
,
data structures
,
dp
x68
1621I
Two Sequences
data structures
,
hashing
,
string suffix structures
3500
x69
730L
Expression Queries
data structures
3200
x69
1237G
Balanced Distribution
data structures
,
dp
,
greedy
3500
x71
1023G
Pisces
data structures
,
flows
,
trees
3400
x72
187E
Heaven Tour
data structures
,
greedy
2900
x74
690B3
Recover Polygon (hard)
data structures
2600
x75
917E
Upside Down
data structures
,
string suffix structures
,
strings
,
trees
3400
x77
1599I
Desert
data structures
,
graphs
2700
x79
1508F
Optimal Encoding
brute force
,
data structures
3500
x79
799G
Cut the pie
binary search
,
data structures
,
geometry
3500
x81
542B
Duck Hunt
data structures
3100
x81
185E
Soap Time! - 2
binary search
,
data structures
3000
x81
1530H
Turing's Award
data structures
,
dp
3400
x83
1503F
Balance the Cards
constructive algorithms
,
data structures
,
divide and conquer
,
geometry
,
graphs
,
implementation
3500
x85
1608G
Alphabetic Tree
binary search
,
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
3500
x87
1578J
Just Kingdom
brute force
,
data structures
,
dfs and similar
3100
x89
1477E
Nezzar and Tournaments
data structures
,
greedy
3300
x89
100G
Name the album
*special problem
,
data structures
,
implementation
1800
x89
1488G
Painting Numbers
*special problem
,
data structures
,
greedy
,
number theory
2500
x91
720F
Array Covering
data structures
3100
x91
1439E
Cheat and Win
bitmasks
,
data structures
,
games
,
trees
3500
x92
786D
Rap God
data structures
,
dfs and similar
,
hashing
,
strings
,
trees
3400
x92
477E
Dreamoon and Notepad
data structures
3100
x92
1208H
Red Blue Tree
data structures
,
implementation
,
trees
3500
x94
962G
Visible Black Areas
data structures
,
dsu
,
geometry
,
trees
2800
x94
1386B
Mixture
*special problem
,
data structures
,
geometry
,
math
,
sortings
2900
x96
1209H
Moving Walkways
data structures
,
greedy
,
math
3300
x98
1464F
My Beautiful Madness
data structures
,
trees
3500
x99
1361F
Johnny and New Toy
data structures
,
implementation
,
math
3300
x99
1588F
Jumping Through the Array
binary search
,
data structures
,
graphs
,
two pointers
3500
x100
1575C
Cyclic Sum
data structures
,
fft
,
number theory
3000
x101
1297F
Movie Fan
*special problem
,
data structures
,
greedy
,
implementation
,
sortings
x101
1423G
Growing flowers
data structures
3500
x102
1523H
Hopping Around the Array
data structures
,
dp
3500
x105
1515I
Phoenix and Diamonds
binary search
,
data structures
,
sortings
3400
x110
1458F
Range Diameter Sum
data structures
,
trees
3500
x110
1466I
The Riddle of the Sphinx
binary search
,
data structures
,
data structures
,
interactive
3400
x115
833E
Caramel Clouds
data structures
,
dp
,
sortings
3400
x116
1056H
Detect Robots
data structures
,
strings
3200
x119
1548E
Gregor and the Two Painters
data structures
,
divide and conquer
,
graphs
,
greedy
,
math
3400
x121
1045J
Moonwalk challenge
data structures
,
strings
,
trees
2600
x121
331D3
Escaping on Beaveractor
data structures
,
implementation
,
trees
3000
x121
1336F
Journey
data structures
,
divide and conquer
,
graphs
,
trees
3500
x125
1043G
Speckled Band
data structures
,
divide and conquer
,
hashing
,
string suffix structures
,
strings
3500
x125
1638F
Two Posters
brute force
,
data structures
,
greedy
,
two pointers
3200
x130
1427F
Boring Card Game
data structures
,
greedy
,
trees
3200
x130
1499G
Graph Coloring
data structures
,
graphs
,
interactive
3100
x131
1488F
Dogecoin
*special problem
,
*special problem
,
binary search
,
data structures
2300
x131
796F
Sequence Recovery
bitmasks
,
data structures
,
greedy
2800
x132
1610G
AmShZ Wins a Bet
data structures
,
greedy
,
hashing
3300
x133
1120F
Secret Letters
data structures
,
dp
,
greedy
3100
x133
1344E
Train Tracks
data structures
,
trees
3100
x134
720D
Slalom
data structures
,
dp
,
sortings
3100
x134
741E
Arpa’s abnormal DNA and Mehrdad’s deep interest
data structures
,
string suffix structures
3400
x135
1148H
Holy Diver
data structures
3500
x138
280E
Sequence Transformation
brute force
,
data structures
,
dp
,
implementation
,
math
3000
x138
1558F
Strange Sort
data structures
,
sortings
3300
x139
1515H
Phoenix and Bits
bitmasks
,
brute force
,
data structures
,
sortings
3500
x139
1500E
Subset Trick
binary search
,
data structures
3300
x139
1083F
The Fair Nut and Amusing Xor
data structures
3300
x140
1572F
Stations
data structures
3400
x142
1083D
The Fair Nut's getting crazy
data structures
,
implementation
3500
x142
243E
Matrix
data structures
3000
x142
1468B
Bakery
data structures
,
dsu
2900
x144
1637H
Minimize Inversions Number
data structures
,
greedy
,
math
,
sortings
3500
x145
792F
Mages and Monsters
data structures
,
geometry
3100
x145
936E
Iqea
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
shortest paths
,
trees
3400
x147
414E
Mashmokh's Designed Problem
data structures
3200
x147
1575M
Managing Telephone Poles
data structures
,
geometry
2400
x148
482E
ELCA
data structures
,
trees
3200
x149
862F
Mahmoud and Ehab and the final stage
data structures
,
strings
2900
x151
1495F
Squares
constructive algorithms
,
data structures
,
dp
,
graphs
,
trees
3300
x158
374E
Inna and Babies
binary search
,
data structures
,
dsu
,
geometry
,
implementation
2600
x158
543E
Listening to Music
constructive algorithms
,
data structures
3200
x159
391D2
Supercollider
data structures
x159
1425I
Impressive Harvesting of The Orchard
data structures
2800
x161
403E
Two Rooted Trees
data structures
,
implementation
,
trees
2900
x161
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