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Problems
#
Name
1837D
Bracket Coloring
constructive algorithms
,
greedy
1400
x13339
1837C
Best Binary String
constructive algorithms
,
greedy
1000
x21107
1837B
Comparison String
greedy
900
x26573
1837A
Grasshopper on a Line
constructive algorithms
,
math
800
x29145
1836B
Astrophysicists
greedy
,
math
1100
x12276
1836A
Destroyer
implementation
,
sortings
800
x19792
1835F
Good Graph
bitmasks
,
dfs and similar
,
graph matchings
,
graphs
,
implementation
3500
x144
1835E
Old Mobile
combinatorics
,
dp
,
probabilities
3500
x202
1835D
Doctor's Brown Hypothesis
dfs and similar
,
graphs
,
math
,
number theory
2900
x448
1835C
Twin Clusters
bitmasks
,
brute force
,
constructive algorithms
,
math
,
probabilities
2600
x939
1835B
Lottery
binary search
,
brute force
,
greedy
,
math
,
two pointers
2500
x903
1835A
k-th equality
brute force
,
implementation
,
math
1700
x7452
1834F
Typewriter
brute force
,
math
2500
x488
1834E
MEX of LCM
binary search
,
data structures
,
implementation
,
math
,
number theory
2300
x2064
1834D
Survey in Class
brute force
,
data structures
,
greedy
,
implementation
,
sortings
1900
x4355
1834C
Game with Reversing
games
,
greedy
,
math
,
strings
1200
x12646
1834B
Maximum Strength
greedy
,
math
1000
x14537
1834A
Unit Array
greedy
,
math
800
x21216
1833G
Ksyusha and Chinchilla
constructive algorithms
,
dfs and similar
,
dp
,
dsu
,
greedy
,
implementation
,
trees
1800
x4947
1833F
Ira and Flamenco
combinatorics
,
constructive algorithms
,
data structures
,
implementation
,
math
,
sortings
,
two pointers
1700
x6702
1833E
Round Dance
dfs and similar
,
dsu
,
graphs
,
shortest paths
1600
x10313
1833D
Flipper
brute force
,
constructive algorithms
,
greedy
1400
x12689
1833C
Vlad Building Beautiful Array
greedy
,
math
800
x25521
1833B
Restore the Weather
greedy
,
sortings
900
x25399
1833A
Musical Puzzle
implementation
,
strings
800
x31587
1832F
Zombies
binary search
,
dp
3200
x253
1832E
Combinatorics Problem
brute force
,
combinatorics
,
dp
2200
x2057
1832D2
Red-Blue Operations (Hard Version)
binary search
,
constructive algorithms
,
greedy
,
implementation
,
math
2400
x1796
1832D1
Red-Blue Operations (Easy Version)
binary search
,
greedy
,
implementation
,
math
2100
x2793
1832C
Contrast Value
greedy
,
implementation
1200
x18271
1832B
Maximum Sum
brute force
,
sortings
,
two pointers
1100
x19651
1832A
New Palindrome
strings
800
x24880
1831B
Array merging
constructive algorithms
,
greedy
1000
x18486
1831A
Twin Permutations
constructive algorithms
800
x24251
1830F
The Third Grace
data structures
,
dp
3200
x221
1830E
Bully Sort
data structures
,
math
3500
x231
1830D
Mex Tree
brute force
,
dp
,
trees
2800
x604
1830C
Hyperregular Bracket Strings
combinatorics
,
greedy
,
hashing
,
math
,
number theory
,
sortings
2400
x1528
1830B
The BOSS Can Count Pairs
brute force
,
math
2000
x4598
1830A
Copil Copac Draws Trees
dfs and similar
,
dp
,
graphs
,
trees
1400
x12453
1829H
Don't Blame Me
bitmasks
,
combinatorics
,
dp
,
math
1700
x7079
1829G
Hits Different
data structures
,
dp
,
implementation
,
math
1600
x9411
1829F
Forever Winter
dfs and similar
,
graphs
,
math
1300
x16186
1829E
The Lakes
dfs and similar
,
dsu
,
graphs
,
implementation
1100
x18230
1829D
Gold Rush
brute force
,
dfs and similar
,
dp
,
implementation
1000
x24234
1829C
Mr. Perfectly Fine
bitmasks
,
greedy
,
implementation
800
x27146
1829B
Blank Space
implementation
800
x40887
1829A
Love Story
implementation
,
strings
800
x45970
1828B
Permutation Swap
math
,
number theory
900
x20655
1828A
Divisible Array
constructive algorithms
,
math
800
x23001
1827F
Copium Permutation
constructive algorithms
,
data structures
,
greedy
3500
x107
1827E
Bus Routes
binary search
,
constructive algorithms
,
dfs and similar
,
greedy
,
trees
3400
x363
1827D
Two Centroids
data structures
,
dfs and similar
,
greedy
,
trees
2800
x705
1827C
Palindrome Partition
binary search
,
brute force
,
data structures
,
dp
,
hashing
,
strings
2600
x1143
1827B2
Range Sorting (Hard Version)
binary search
,
data structures
,
dp
,
greedy
2400
x1774
1827B1
Range Sorting (Easy Version)
binary search
,
dp
,
dsu
,
greedy
,
trees
,
two pointers
2000
x3665
1827A
Counting Orders
combinatorics
,
math
,
sortings
,
two pointers
1100
x17486
1826F
Fading into Fog
geometry
,
interactive
,
math
,
probabilities
2800
x338
1826E
Walk the Runway
bitmasks
,
brute force
,
data structures
,
dp
,
graphs
,
implementation
,
sortings
2400
x1501
1826D
Running Miles
brute force
,
dp
,
greedy
1700
x8556
1826C
Dreaming of Freedom
greedy
,
math
,
number theory
1300
x12788
1826B
Lunatic Never Content
math
,
number theory
1100
x15740
1826A
Trust Nobody
brute force
,
greedy
,
implementation
,
sortings
1200
x14503
1825B
LuoTianyi and the Table
greedy
,
math
1000
x14172
1825A
LuoTianyi and the Palindrome String
greedy
,
strings
800
x19272
1824E
LuoTianyi and Cartridge
data structures
,
trees
3500
x124
1824D
LuoTianyi and the Function
data structures
3000
x450
1824C
LuoTianyi and XOR-Tree
data structures
,
dfs and similar
,
dp
,
dsu
,
greedy
,
trees
2500
x1255
1824B2
LuoTianyi and the Floating Islands (Hard Version)
combinatorics
,
dfs and similar
,
math
,
probabilities
,
trees
2300
x2494
1824B1
LuoTianyi and the Floating Islands (Easy Version)
combinatorics
,
math
,
probabilities
,
trees
1800
x4331
1824A
LuoTianyi and the Show
greedy
,
implementation
1400
x10798
1823F
Random Walk
dp
,
graphs
,
math
,
probabilities
,
trees
2600
x787
1823E
Removing Graph
brute force
,
dp
,
games
,
graphs
,
math
2500
x1197
1823D
Unique Palindromes
constructive algorithms
,
math
,
strings
1900
x3652
1823C
Strongly Composite
greedy
,
math
,
number theory
1300
x11669
1823B
Sort with Step
brute force
,
math
,
sortings
900
x15323
1823A
A-characteristic
combinatorics
,
constructive algorithms
,
math
800
x15806
1822G2
Magic Triples (Hard Version)
brute force
,
data structures
,
math
,
number theory
2200
x2311
1822G1
Magic Triples (Easy Version)
brute force
,
data structures
,
math
,
number theory
1700
x6497
1822F
Gardening Friends
brute force
,
dfs and similar
,
dp
,
graphs
,
trees
1700
x5571
1822E
Making Anti-Palindromes
greedy
,
math
,
strings
1600
x9705
1822D
Super-Permutation
constructive algorithms
,
math
1200
x15908
1822C
Bun Lover
math
800
x22315
1822B
Karina and Array
greedy
,
math
,
sortings
800
x24082
1822A
TubeTube Feed
brute force
,
implementation
800
x23639
1821F
Timber
combinatorics
,
dp
,
fft
,
math
2600
x705
1821E
Rearrange Brackets
brute force
,
dp
,
greedy
,
sortings
,
strings
2100
x2247
1821D
Black Cells
binary search
,
brute force
,
greedy
,
math
1900
x4757
1821C
Tear It Apart
brute force
,
implementation
,
math
,
strings
1300
x13599
1821B
Sort the Subarray
brute force
,
greedy
1100
x16936
1821A
Matching
combinatorics
,
math
800
x19369
1820B
JoJo's Incredible Adventures
math
,
strings
,
two pointers
1100
x13400
1820A
Yura's New Name
implementation
,
strings
800
x16350
1819F
Willy-nilly, Crack, Into Release!
data structures
,
dp
3500
x127
1819E
Roads in E City
interactive
,
math
,
probabilities
,
trees
3200
x244
1819D
Misha and Apples
brute force
,
data structures
,
dp
,
two pointers
2800
x597
1819C
The Fox and the Complete Tree Traversal
constructive algorithms
,
dp
,
implementation
,
math
,
trees
2400
x1396
1819B
The Butcher
geometry
,
greedy
,
implementation
,
sortings
,
two pointers
1900
x3432
1819A
Constructive Problem
brute force
,
greedy
1300
x12069
1818B
Indivisible
constructive algorithms
900
x14033
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