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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
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number theory
probabilities
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strings
ternary search
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Problems
#
Name
1620A
Equal or Not Equal
constructive algorithms
,
dsu
,
implementation
800
x21207
1249B1
Books Exchange (easy version)
dsu
,
math
1000
x20121
1829E
The Lakes
dfs and similar
,
dsu
,
graphs
,
implementation
1100
x18173
501B
Misha and Changing Handles
data structures
,
dsu
,
strings
1100
x15608
217A
Ice Skating
brute force
,
dfs and similar
,
dsu
,
graphs
1200
x20370
1592B
Hemose Shopping
constructive algorithms
,
dsu
,
math
,
sortings
1200
x15577
902B
Coloring a Tree
dfs and similar
,
dsu
,
greedy
1200
x10470
959B
Mahmoud and Ehab and the message
dsu
,
greedy
,
implementation
1200
x9087
1927D
Find the Different Ones!
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
two pointers
1300
x18212
1249B2
Books Exchange (hard version)
dfs and similar
,
dsu
,
math
1300
x16251
1638C
Inversion Graph
data structures
,
dsu
,
graphs
,
math
1300
x14362
1534C
Little Alawn's Puzzle
combinatorics
,
dp
,
dsu
,
graphs
,
math
1300
x12485
1726C
Jatayu's Balanced Bracket Sequence
data structures
,
dsu
,
graphs
,
greedy
1300
x12070
755C
PolandBall and Forest
dfs and similar
,
dsu
,
graphs
,
interactive
,
trees
1300
x11679
515B
Drazil and His Happy Friends
brute force
,
dsu
,
meet-in-the-middle
,
number theory
1300
x7362
886C
Petya and Catacombs
dsu
,
greedy
,
implementation
,
trees
1300
x5429
1055B
Alice and Hairdresser
dsu
,
implementation
1300
x4893
277A
Learning Languages
dfs and similar
,
dsu
1400
x18104
1167C
News Distribution
dfs and similar
,
dsu
,
graphs
1400
x17028
1559D1
Mocha and Diana (Easy Version)
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
trees
1400
x13215
1292A
NEKO's Maze Game
data structures
,
dsu
,
implementation
1400
x12935
1800E1
Unforgivable Curse (easy version)
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
strings
1400
x12141
445B
DZY Loves Chemistry
dfs and similar
,
dsu
,
greedy
1400
x12104
505B
Mr. Kitayuta's Colorful Graph
dfs and similar
,
dp
,
dsu
,
graphs
1400
x12087
1909C
Heavy Intervals
constructive algorithms
,
data structures
,
dsu
,
greedy
,
math
,
sortings
1400
x9922
1735C
Phase Shift
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
strings
1400
x9564
1670C
Where is the Pizza?
data structures
,
dfs and similar
,
dsu
,
graphs
,
implementation
,
math
1400
x9505
1130C
Connect
brute force
,
dfs and similar
,
dsu
1400
x8320
843A
Sorting by Subsequences
dfs and similar
,
dsu
,
implementation
,
math
,
sortings
1400
x5545
60B
Serial Time!
dfs and similar
,
dsu
1400
x4439
977E
Cyclic Components
dfs and similar
,
dsu
,
graphs
1500
x19224
1332C
K-Complete Word
dfs and similar
,
dsu
,
greedy
,
implementation
,
strings
1500
x15633
771A
Bear and Friendship Condition
dfs and similar
,
dsu
,
graphs
1500
x14625
1263D
Secret Passwords
dfs and similar
,
dsu
,
graphs
1500
x13282
356A
Knight Tournament
data structures
,
dsu
1500
x12770
1800E2
Unforgivable Curse (hard version)
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
strings
1500
x12035
1139C
Edgy Trees
dfs and similar
,
dsu
,
graphs
,
math
,
trees
1500
x12015
1675E
Replace With the Previous, Minimize
dsu
,
greedy
,
strings
1500
x10101
409H
A + B Strikes Back
*special problem
,
brute force
,
constructive algorithms
,
dsu
,
implementation
1500
x8683
103B
Cthulhu
dfs and similar
,
dsu
,
graphs
1500
x8521
490B
Queue
dsu
,
implementation
1500
x5900
875B
Sorting the Coins
dsu
,
implementation
,
sortings
,
two pointers
1500
x5146
17B
Hierarchy
dfs and similar
,
dsu
,
greedy
,
shortest paths
1500
x4471
1575J
Jeopardy of Dropped Balls
binary search
,
brute force
,
dsu
,
implementation
1500
x3646
177C1
Party
dfs and similar
,
dsu
,
graphs
1500
x2445
177C2
Party
brute force
,
dfs and similar
,
dsu
,
graphs
1500
x2438
1702E
Split Into Two Sets
dfs and similar
,
dsu
,
graphs
1600
x12327
1833E
Round Dance
dfs and similar
,
dsu
,
graphs
,
shortest paths
1600
x10280
763A
Timofey and a tree
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
trees
1600
x10104
722C
Destroying Array
data structures
,
dsu
1600
x8843
500B
New Year Permutation
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
,
sortings
1600
x8694
659E
New Reform
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
1600
x7317
939D
Love Rescue
dfs and similar
,
dsu
,
graphs
,
greedy
,
strings
1600
x7130
1609D
Social Network
dsu
,
graphs
,
greedy
,
implementation
,
trees
1600
x6911
723D
Lakes in Berland
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
1600
x6814
731C
Socks
dfs and similar
,
dsu
,
graphs
,
greedy
1600
x6788
741B
Arpa's weak amphitheater and Mehrdad's valuable Hoses
dfs and similar
,
dp
,
dsu
1600
x5139
28B
pSort
dfs and similar
,
dsu
,
graphs
1600
x4399
1365D
Solve The Maze
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
shortest paths
1700
x16143
1176E
Cover it!
dfs and similar
,
dsu
,
graphs
,
shortest paths
,
trees
1700
x10433
1383A
String Transformation 1
dsu
,
graphs
,
greedy
,
sortings
,
strings
,
trees
,
two pointers
1700
x10231
1253D
Harmonious Graph
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
1700
x8837
1209D
Cow and Snacks
dfs and similar
,
dsu
,
graphs
1700
x8810
1476D
Journey
dfs and similar
,
dp
,
dsu
,
implementation
1700
x8382
1411C
Peaceful Rooks
dfs and similar
,
dsu
,
graphs
1700
x7764
1850H
The Third Letter
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
1700
x7493
1779D
Boris and His Amazing Haircut
constructive algorithms
,
data structures
,
dp
,
dsu
,
greedy
,
sortings
1700
x7493
1594D
The Number of Imposters
constructive algorithms
,
dfs and similar
,
dp
,
dsu
,
graphs
1700
x7103
1873H
Mad City
dfs and similar
,
dsu
,
games
,
graphs
,
shortest paths
,
trees
1700
x6562
1131F
Asya And Kittens
constructive algorithms
,
dsu
1700
x6385
698B
Fix a Tree
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
trees
1700
x5606
691D
Swaps in Permutation
dfs and similar
,
dsu
,
math
1700
x5293
670E
Correct Bracket Sequence Editor
data structures
,
dsu
,
strings
1700
x3152
765D
Artsem and Saunders
constructive algorithms
,
dsu
,
math
1700
x2442
1845D
Rating System
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
math
,
two pointers
1800
x7305
1213G
Path Queries
divide and conquer
,
dsu
,
graphs
,
sortings
,
trees
1800
x6610
1859D
Andrey and Escape from Capygrad
binary search
,
data structures
,
dp
,
dsu
,
greedy
,
sortings
1800
x6534
1872F
Selling a Menagerie
dfs and similar
,
dsu
,
graphs
,
implementation
,
math
1800
x5797
371D
Vessels
data structures
,
dsu
,
implementation
,
trees
1800
x5314
1833G
Ksyusha and Chinchilla
constructive algorithms
,
dfs and similar
,
dp
,
dsu
,
greedy
,
implementation
,
trees
1800
x4936
1442B
Identify the Operations
combinatorics
,
data structures
,
dsu
,
greedy
,
implementation
1800
x4304
1468J
Road Reform
dsu
,
graphs
,
greedy
1800
x3908
1081D
Maximum Distance
dsu
,
graphs
,
shortest paths
,
sortings
1800
x3880
436C
Dungeons and Candies
dsu
,
graphs
,
greedy
,
trees
1800
x2578
603B
Moodular Arithmetic
combinatorics
,
dfs and similar
,
dsu
,
math
,
number theory
1800
x2534
1402A
Fancy Fence
*special problem
,
data structures
,
dsu
,
implementation
,
math
,
sortings
1800
x1138
25D
Roads not only in Berland
dsu
,
graphs
,
trees
1900
x10354
547B
Mike and Feet
binary search
,
data structures
,
dp
,
dsu
1900
x8219
1620E
Replace the Numbers
constructive algorithms
,
data structures
,
dsu
,
implementation
1900
x7766
1242B
0-1 MST
dfs and similar
,
dsu
,
graphs
,
sortings
1900
x6974
1245D
Shichikuji and Power Grid
dsu
,
graphs
,
greedy
,
shortest paths
,
trees
1900
x6899
1095F
Make It Connected
dsu
,
graphs
,
greedy
1900
x5846
1624G
MinOr Tree
bitmasks
,
dfs and similar
,
dsu
,
graphs
,
greedy
1900
x5530
1922D
Berserk Monsters
brute force
,
data structures
,
dsu
,
implementation
,
math
1900
x5217
1920D
Array Repetition
binary search
,
brute force
,
dsu
,
implementation
,
math
1900
x5084
472D
Design Tutorial: Inverse the Problem
dfs and similar
,
dsu
,
shortest paths
,
trees
1900
x5005
1276B
Two Fairs
combinatorics
,
dfs and similar
,
dsu
,
graphs
1900
x4666
817D
Imbalanced Array
data structures
,
divide and conquer
,
dsu
,
sortings
1900
x4397
1927F
Microcycle
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
sortings
,
trees
1900
x3775
1482D
Playlist
data structures
,
dsu
,
implementation
,
shortest paths
1900
x3730
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