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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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Problems
#
Name
1967F
Next and Prev
brute force
,
data structures
,
implementation
3200
x25
1297I
Falling Blocks
*special problem
,
data structures
x27
1488J
Flower Shop
*special problem
,
data structures
,
fft
,
math
3100
x31
1940C
Burenka and Pether
*special problem
,
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
sortings
,
trees
x32
1346H
Game with Segments
*special problem
,
data structures
,
games
2700
x46
1488H
Build From Suffixes
*special problem
,
combinatorics
,
data structures
2800
x53
1571I
Physical Examination
*special problem
,
binary search
,
data structures
3200
x54
1942H
Farmer John's Favorite Intern
data structures
,
dp
,
flows
,
trees
3500
x59
1909H
Parallel Swaps Sort
constructive algorithms
,
data structures
3500
x61
1776E
Crossing the Railways
data structures
,
dp
3500
x62
1580E
Railway Construction
brute force
,
constructive algorithms
,
data structures
,
graphs
,
shortest paths
3400
x64
853E
Lada Malina
data structures
,
geometry
3400
x64
175F
Gnomes of Might and Magic
data structures
,
graphs
,
implementation
,
shortest paths
3000
x64
1971G
XOUR
data structures
,
dsu
,
sortings
x66
1599E
Two Arrays
data structures
,
matrices
3200
x66
1965F
Conference
data structures
,
flows
3300
x68
1889F
Doremy's Average Tree
data structures
,
dp
,
greedy
,
trees
3500
x68
1218B
Guarding warehouses
data structures
,
geometry
3000
x68
1868F
LIS?
data structures
,
greedy
,
implementation
3500
x69
1571G
A Battle Against a Dragon
*special problem
,
data structures
,
dp
2500
x71
1750H
BinaryStringForces
constructive algorithms
,
data structures
,
dp
3500
x72
1491I
Ruler Of The Zoo
brute force
,
data structures
3500
x73
1545E1
AquaMoon and Time Stop (easy version)
data structures
,
dp
3500
x74
1910H
Sum of Digits of Sums
*special problem
,
binary search
,
data structures
2400
x77
1870H
Standard Graph Problem
data structures
,
graphs
,
greedy
,
trees
3500
x77
1545E2
AquaMoon and Time Stop (hard version)
data structures
,
dp
3500
x79
1533H
Submatrices
*special problem
,
bitmasks
,
data structures
,
dp
x80
471E
MUH and Lots and Lots of Segments
data structures
,
dsu
2700
x80
1628F
Spaceship Crisis Management
binary search
,
data structures
,
geometry
,
sortings
3500
x84
730L
Expression Queries
data structures
3200
x84
1746G
Olympiad Training
binary search
,
data structures
,
dp
,
flows
,
geometry
,
implementation
,
sortings
3500
x88
690B3
Recover Polygon (hard)
data structures
2600
x90
187E
Heaven Tour
data structures
,
greedy
2900
x91
1852F
Panda Meetups
data structures
,
dp
,
flows
3500
x98
1081H
Palindromic Magic
data structures
,
hashing
,
strings
3500
x99
1648F
Two Avenues
data structures
,
dfs and similar
,
graphs
3500
x103
1545F
AquaMoon and Potatoes
brute force
,
data structures
,
dp
3500
x103
649E
Автобус
binary search
,
data structures
,
greedy
,
sortings
2100
x103
185E
Soap Time! - 2
binary search
,
data structures
3000
x103
1740I
Arranging Crystal Balls
data structures
,
divide and conquer
,
divide and conquer
,
dp
,
geometry
,
graphs
,
number theory
3500
x104
1827F
Copium Permutation
constructive algorithms
,
data structures
,
greedy
3500
x107
799G
Cut the pie
binary search
,
data structures
,
geometry
3500
x107
1737G
Ela Takes Dancing Class
binary search
,
data structures
3500
x108
1621I
Two Sequences
data structures
,
hashing
,
string suffix structures
3500
x109
100G
Name the album
*special problem
,
data structures
,
implementation
1800
x109
1599I
Desert
data structures
,
graphs
2700
x112
1297F
Movie Fan
*special problem
,
data structures
,
greedy
,
implementation
,
sortings
x113
1023G
Pisces
data structures
,
flows
,
trees
3400
x113
1876G
Clubstep
binary search
,
brute force
,
data structures
,
greedy
,
trees
3500
x117
1508F
Optimal Encoding
brute force
,
data structures
3500
x117
1488G
Painting Numbers
*special problem
,
data structures
,
greedy
,
number theory
2500
x117
1477E
Nezzar and Tournaments
data structures
,
greedy
3300
x117
1386B
Mixture
*special problem
,
data structures
,
geometry
,
math
,
sortings
2900
x118
207C3
Game with Two Trees
data structures
2700
x118
1237G
Balanced Distribution
data structures
,
dp
,
greedy
3500
x119
1866F
Freak Joker Process
binary search
,
data structures
,
sortings
3100
x120
917E
Upside Down
data structures
,
string suffix structures
,
strings
,
trees
3400
x122
1940D
Almost Certainly
*special problem
,
constructive algorithms
,
data structures
,
sortings
x123
1824E
LuoTianyi and Cartridge
data structures
,
trees
3500
x124
962G
Visible Black Areas
data structures
,
dsu
,
geometry
,
trees
2800
x125
542B
Duck Hunt
data structures
3100
x125
1819F
Willy-nilly, Crack, Into Release!
data structures
,
dp
3500
x127
1844H
Multiple of Three Cycles
combinatorics
,
data structures
,
dp
,
dsu
,
math
3400
x131
1726F
Late For Work (submissions are not allowed)
data structures
,
greedy
,
schedules
,
shortest paths
2900
x131
477E
Dreamoon and Notepad
data structures
3100
x131
1503F
Balance the Cards
constructive algorithms
,
data structures
,
divide and conquer
,
geometry
,
graphs
,
implementation
3500
x134
1060G
Balls and Pockets
data structures
3400
x134
1209H
Moving Walkways
data structures
,
greedy
,
math
3300
x136
786D
Rap God
data structures
,
dfs and similar
,
hashing
,
strings
,
trees
3400
x136
1672I
PermutationForces
data structures
,
greedy
3000
x137
1530H
Turing's Award
data structures
,
dp
3400
x140
1208H
Red Blue Tree
data structures
,
implementation
,
trees
3500
x141
1685E
The Ultimate LIS Problem
data structures
,
greedy
3500
x142
720F
Array Covering
data structures
3100
x144
1718F
Burenka, an Array and Queries
data structures
,
math
,
number theory
3300
x145
1361F
Johnny and New Toy
data structures
,
implementation
,
math
3300
x146
1056H
Detect Robots
data structures
,
strings
3200
x146
1787I
Treasure Hunt
data structures
,
divide and conquer
,
two pointers
3400
x148
1608G
Alphabetic Tree
binary search
,
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
3500
x149
1758F
Decent Division
constructive algorithms
,
data structures
3000
x154
1575C
Cyclic Sum
data structures
,
fft
,
number theory
3000
x155
1852E
Rivalries
constructive algorithms
,
data structures
,
greedy
3400
x157
1886F
Diamond Theft
data structures
,
greedy
3300
x158
1045J
Moonwalk challenge
data structures
,
strings
,
trees
2600
x163
1764H
Doremy's Paint 2
data structures
3400
x166
1488F
Dogecoin
*special problem
,
*special problem
,
binary search
,
data structures
2300
x167
796F
Sequence Recovery
bitmasks
,
data structures
,
greedy
2800
x169
331D3
Escaping on Beaveractor
data structures
,
implementation
,
trees
3000
x170
243E
Matrix
data structures
3000
x171
1895G
Two Characters, Two Colors
binary search
,
data structures
,
dp
,
flows
,
greedy
3100
x172
741E
Arpa’s abnormal DNA and Mehrdad’s deep interest
data structures
,
string suffix structures
3400
x174
482E
ELCA
data structures
,
trees
3200
x175
391D2
Supercollider
data structures
x177
374E
Inna and Babies
binary search
,
data structures
,
dsu
,
geometry
,
implementation
2600
x178
1466I
The Riddle of the Sphinx
binary search
,
data structures
,
data structures
,
interactive
3400
x180
1423G
Growing flowers
data structures
3500
x180
936E
Iqea
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
shortest paths
,
trees
3400
x182
1499G
Graph Coloring
data structures
,
graphs
,
interactive
3100
x186
1638F
Two Posters
brute force
,
data structures
,
greedy
,
two pointers
3200
x189
167D
Wizards and Roads
data structures
,
divide and conquer
,
graph matchings
,
graphs
,
greedy
3000
x190
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