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Problems
#
Name
1620A
Equal or Not Equal
constructive algorithms
,
dsu
,
implementation
800
x21251
217A
Ice Skating
brute force
,
dfs and similar
,
dsu
,
graphs
1200
x20450
1249B1
Books Exchange (easy version)
dsu
,
math
1000
x20142
977E
Cyclic Components
dfs and similar
,
dsu
,
graphs
1500
x19337
1927D
Find the Different Ones!
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
two pointers
1300
x18467
1829E
The Lakes
dfs and similar
,
dsu
,
graphs
,
implementation
1100
x18329
277A
Learning Languages
dfs and similar
,
dsu
1400
x18152
1167C
News Distribution
dfs and similar
,
dsu
,
graphs
1400
x17123
1249B2
Books Exchange (hard version)
dfs and similar
,
dsu
,
math
1300
x16267
1365D
Solve The Maze
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
shortest paths
1700
x16205
1332C
K-Complete Word
dfs and similar
,
dsu
,
greedy
,
implementation
,
strings
1500
x15704
501B
Misha and Changing Handles
data structures
,
dsu
,
strings
1100
x15647
1592B
Hemose Shopping
constructive algorithms
,
dsu
,
math
,
sortings
1200
x15614
771A
Bear and Friendship Condition
dfs and similar
,
dsu
,
graphs
1500
x14662
1638C
Inversion Graph
data structures
,
dsu
,
graphs
,
math
1300
x14388
1263D
Secret Passwords
dfs and similar
,
dsu
,
graphs
1500
x13320
1559D1
Mocha and Diana (Easy Version)
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
trees
1400
x13265
1292A
NEKO's Maze Game
data structures
,
dsu
,
implementation
1400
x12946
356A
Knight Tournament
data structures
,
dsu
1500
x12819
600E
Lomsat gelral
data structures
,
dfs and similar
,
dsu
,
trees
2300
x12728
1534C
Little Alawn's Puzzle
combinatorics
,
dp
,
dsu
,
graphs
,
math
1300
x12520
1702E
Split Into Two Sets
dfs and similar
,
dsu
,
graphs
1600
x12422
1800E1
Unforgivable Curse (easy version)
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
strings
1400
x12195
445B
DZY Loves Chemistry
dfs and similar
,
dsu
,
greedy
1400
x12138
1800E2
Unforgivable Curse (hard version)
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
strings
1500
x12112
505B
Mr. Kitayuta's Colorful Graph
dfs and similar
,
dp
,
dsu
,
graphs
1400
x12112
1726C
Jatayu's Balanced Bracket Sequence
data structures
,
dsu
,
graphs
,
greedy
1300
x12091
1139C
Edgy Trees
dfs and similar
,
dsu
,
graphs
,
math
,
trees
1500
x12070
755C
PolandBall and Forest
dfs and similar
,
dsu
,
graphs
,
interactive
,
trees
1300
x11715
902B
Coloring a Tree
dfs and similar
,
dsu
,
greedy
1200
x10492
1176E
Cover it!
dfs and similar
,
dsu
,
graphs
,
shortest paths
,
trees
1700
x10475
25D
Roads not only in Berland
dsu
,
graphs
,
trees
1900
x10418
1833E
Round Dance
dfs and similar
,
dsu
,
graphs
,
shortest paths
1600
x10394
1383A
String Transformation 1
dsu
,
graphs
,
greedy
,
sortings
,
strings
,
trees
,
two pointers
1700
x10242
763A
Timofey and a tree
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
trees
1600
x10142
1675E
Replace With the Previous, Minimize
dsu
,
greedy
,
strings
1500
x10141
1909C
Heavy Intervals
constructive algorithms
,
data structures
,
dsu
,
greedy
,
math
,
sortings
1400
x10032
1735C
Phase Shift
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
strings
1400
x9598
1670C
Where is the Pizza?
data structures
,
dfs and similar
,
dsu
,
graphs
,
implementation
,
math
1400
x9534
959B
Mahmoud and Ehab and the message
dsu
,
greedy
,
implementation
1200
x9158
1370D
Odd-Even Subsequence
binary search
,
dp
,
dsu
,
greedy
,
implementation
2000
x9151
722C
Destroying Array
data structures
,
dsu
1600
x8871
1253D
Harmonious Graph
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
1700
x8853
1209D
Cow and Snacks
dfs and similar
,
dsu
,
graphs
1700
x8835
500B
New Year Permutation
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
,
sortings
1600
x8716
409H
A + B Strikes Back
*special problem
,
brute force
,
constructive algorithms
,
dsu
,
implementation
1500
x8692
103B
Cthulhu
dfs and similar
,
dsu
,
graphs
1500
x8540
1476D
Journey
dfs and similar
,
dp
,
dsu
,
implementation
1700
x8402
1130C
Connect
brute force
,
dfs and similar
,
dsu
1400
x8337
547B
Mike and Feet
binary search
,
data structures
,
dp
,
dsu
1900
x8250
1620E
Replace the Numbers
constructive algorithms
,
data structures
,
dsu
,
implementation
1900
x7800
1411C
Peaceful Rooks
dfs and similar
,
dsu
,
graphs
1700
x7776
1850H
The Third Letter
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
1700
x7560
1779D
Boris and His Amazing Haircut
constructive algorithms
,
data structures
,
dp
,
dsu
,
greedy
,
sortings
1700
x7535
515B
Drazil and His Happy Friends
brute force
,
dsu
,
meet-in-the-middle
,
number theory
1300
x7367
1845D
Rating System
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
math
,
two pointers
1800
x7346
659E
New Reform
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
1600
x7331
939D
Love Rescue
dfs and similar
,
dsu
,
graphs
,
greedy
,
strings
1600
x7144
1594D
The Number of Imposters
constructive algorithms
,
dfs and similar
,
dp
,
dsu
,
graphs
1700
x7115
1609D
Social Network
dsu
,
graphs
,
greedy
,
implementation
,
trees
1600
x6999
609E
Minimum spanning tree for each edge
data structures
,
dfs and similar
,
dsu
,
graphs
,
trees
2100
x6988
1242B
0-1 MST
dfs and similar
,
dsu
,
graphs
,
sortings
1900
x6986
1245D
Shichikuji and Power Grid
dsu
,
graphs
,
greedy
,
shortest paths
,
trees
1900
x6928
723D
Lakes in Berland
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
1600
x6824
731C
Socks
dfs and similar
,
dsu
,
graphs
,
greedy
1600
x6797
1213G
Path Queries
divide and conquer
,
dsu
,
graphs
,
sortings
,
trees
1800
x6646
1873H
Mad City
dfs and similar
,
dsu
,
games
,
graphs
,
shortest paths
,
trees
1700
x6633
1859D
Andrey and Escape from Capygrad
binary search
,
data structures
,
dp
,
dsu
,
greedy
,
sortings
1800
x6573
1131F
Asya And Kittens
constructive algorithms
,
dsu
1700
x6404
1971G
XOUR
data structures
,
dsu
,
sortings
1400
x6283
920F
SUM and REPLACE
brute force
,
data structures
,
dsu
,
number theory
2000
x6256
490B
Queue
dsu
,
implementation
1500
x5901
1095F
Make It Connected
dsu
,
graphs
,
greedy
1900
x5874
1872F
Selling a Menagerie
dfs and similar
,
dsu
,
graphs
,
implementation
,
math
1800
x5830
920E
Connected Components?
data structures
,
dfs and similar
,
dsu
,
graphs
2100
x5819
1344B
Monopole Magnets
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2000
x5779
698B
Fix a Tree
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
trees
1700
x5617
1624G
MinOr Tree
bitmasks
,
dfs and similar
,
dsu
,
graphs
,
greedy
1900
x5566
843A
Sorting by Subsequences
dfs and similar
,
dsu
,
implementation
,
math
,
sortings
1400
x5559
886C
Petya and Catacombs
dsu
,
greedy
,
implementation
,
trees
1300
x5433
13E
Holes
data structures
,
dsu
2700
x5397
371D
Vessels
data structures
,
dsu
,
implementation
,
trees
1800
x5346
691D
Swaps in Permutation
dfs and similar
,
dsu
,
math
1700
x5309
1922D
Berserk Monsters
brute force
,
data structures
,
dsu
,
implementation
,
math
1900
x5250
455C
Civilization
dfs and similar
,
dp
,
dsu
,
ternary search
,
trees
2100
x5161
875B
Sorting the Coins
dsu
,
implementation
,
sortings
,
two pointers
1500
x5150
741B
Arpa's weak amphitheater and Mehrdad's valuable Hoses
dfs and similar
,
dp
,
dsu
1600
x5142
1920D
Array Repetition
binary search
,
brute force
,
dsu
,
implementation
,
math
1900
x5132
1009F
Dominant Indices
data structures
,
dsu
,
trees
2300
x5127
1513D
GCD and MST
constructive algorithms
,
dsu
,
graphs
,
greedy
,
number theory
,
sortings
2000
x5061
472D
Design Tutorial: Inverse the Problem
dfs and similar
,
dsu
,
shortest paths
,
trees
1900
x5039
1833G
Ksyusha and Chinchilla
constructive algorithms
,
dfs and similar
,
dp
,
dsu
,
greedy
,
implementation
,
trees
1800
x4964
1055B
Alice and Hairdresser
dsu
,
implementation
1300
x4899
776D
The Door Problem
2-sat
,
dfs and similar
,
dsu
,
graphs
2000
x4847
1276B
Two Fairs
combinatorics
,
dfs and similar
,
dsu
,
graphs
1900
x4674
17B
Hierarchy
dfs and similar
,
dsu
,
greedy
,
shortest paths
1500
x4488
60B
Serial Time!
dfs and similar
,
dsu
1400
x4449
28B
pSort
dfs and similar
,
dsu
,
graphs
1600
x4424
817D
Imbalanced Array
data structures
,
divide and conquer
,
dsu
,
sortings
1900
x4415
1442B
Identify the Operations
combinatorics
,
data structures
,
dsu
,
greedy
,
implementation
1800
x4315
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