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Before contest
Codeforces Round 941 (Div. 1)
41:28:39
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Before contest
Codeforces Round 941 (Div. 2)
41:28:40
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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
schedules
shortest paths
sortings
string suffix structures
strings
ternary search
trees
two pointers
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Problems
#
Name
1620A
Equal or Not Equal
constructive algorithms
,
dsu
,
implementation
800
x21173
217A
Ice Skating
brute force
,
dfs and similar
,
dsu
,
graphs
1200
x20326
1249B1
Books Exchange (easy version)
dsu
,
math
1000
x20077
977E
Cyclic Components
dfs and similar
,
dsu
,
graphs
1500
x19135
1829E
The Lakes
dfs and similar
,
dsu
,
graphs
,
implementation
1100
x18084
277A
Learning Languages
dfs and similar
,
dsu
1400
x18062
1927D
Find the Different Ones!
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
two pointers
1300
x18037
1167C
News Distribution
dfs and similar
,
dsu
,
graphs
1400
x16854
1249B2
Books Exchange (hard version)
dfs and similar
,
dsu
,
math
1300
x16221
1365D
Solve The Maze
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
shortest paths
1700
x16087
1332C
K-Complete Word
dfs and similar
,
dsu
,
greedy
,
implementation
,
strings
1500
x15566
501B
Misha and Changing Handles
data structures
,
dsu
,
strings
1100
x15555
1592B
Hemose Shopping
constructive algorithms
,
dsu
,
math
,
sortings
1200
x15554
771A
Bear and Friendship Condition
dfs and similar
,
dsu
,
graphs
1500
x14588
1638C
Inversion Graph
data structures
,
dsu
,
graphs
,
math
1300
x14338
1263D
Secret Passwords
dfs and similar
,
dsu
,
graphs
1500
x13206
1559D1
Mocha and Diana (Easy Version)
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
trees
1400
x13169
1292A
NEKO's Maze Game
data structures
,
dsu
,
implementation
1400
x12930
356A
Knight Tournament
data structures
,
dsu
1500
x12710
600E
Lomsat gelral
data structures
,
dfs and similar
,
dsu
,
trees
2300
x12586
1534C
Little Alawn's Puzzle
combinatorics
,
dp
,
dsu
,
graphs
,
math
1300
x12468
1702E
Split Into Two Sets
dfs and similar
,
dsu
,
graphs
1600
x12260
1800E1
Unforgivable Curse (easy version)
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
strings
1400
x12090
445B
DZY Loves Chemistry
dfs and similar
,
dsu
,
greedy
1400
x12066
505B
Mr. Kitayuta's Colorful Graph
dfs and similar
,
dp
,
dsu
,
graphs
1400
x12064
1800E2
Unforgivable Curse (hard version)
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
strings
1500
x11979
1139C
Edgy Trees
dfs and similar
,
dsu
,
graphs
,
math
,
trees
1500
x11951
1726C
Jatayu's Balanced Bracket Sequence
data structures
,
dsu
,
graphs
,
greedy
1300
x11844
755C
PolandBall and Forest
dfs and similar
,
dsu
,
graphs
,
interactive
,
trees
1300
x11396
902B
Coloring a Tree
dfs and similar
,
dsu
,
greedy
1200
x10447
1176E
Cover it!
dfs and similar
,
dsu
,
graphs
,
shortest paths
,
trees
1700
x10404
25D
Roads not only in Berland
dsu
,
graphs
,
trees
1900
x10282
1383A
String Transformation 1
dsu
,
graphs
,
greedy
,
sortings
,
strings
,
trees
,
two pointers
1700
x10225
1833E
Round Dance
dfs and similar
,
dsu
,
graphs
,
shortest paths
1600
x10188
763A
Timofey and a tree
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
trees
1600
x10080
1675E
Replace With the Previous, Minimize
dsu
,
greedy
,
strings
1500
x10059
1909C
Heavy Intervals
constructive algorithms
,
data structures
,
dsu
,
greedy
,
math
,
sortings
1400
x9864
1735C
Phase Shift
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
strings
1400
x9539
1670C
Where is the Pizza?
data structures
,
dfs and similar
,
dsu
,
graphs
,
implementation
,
math
1400
x9479
1370D
Odd-Even Subsequence
binary search
,
dp
,
dsu
,
greedy
,
implementation
2000
x9109
959B
Mahmoud and Ehab and the message
dsu
,
greedy
,
implementation
1200
x9072
1253D
Harmonious Graph
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
1700
x8820
722C
Destroying Array
data structures
,
dsu
1600
x8795
1209D
Cow and Snacks
dfs and similar
,
dsu
,
graphs
1700
x8792
500B
New Year Permutation
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
,
sortings
1600
x8682
409H
A + B Strikes Back
*special problem
,
brute force
,
constructive algorithms
,
dsu
,
implementation
1500
x8653
103B
Cthulhu
dfs and similar
,
dsu
,
graphs
1500
x8510
1476D
Journey
dfs and similar
,
dp
,
dsu
,
implementation
1700
x8375
1130C
Connect
brute force
,
dfs and similar
,
dsu
1400
x8301
547B
Mike and Feet
binary search
,
data structures
,
dp
,
dsu
1900
x8187
1411C
Peaceful Rooks
dfs and similar
,
dsu
,
graphs
1700
x7755
1620E
Replace the Numbers
constructive algorithms
,
data structures
,
dsu
,
implementation
1900
x7730
1779D
Boris and His Amazing Haircut
constructive algorithms
,
data structures
,
dp
,
dsu
,
greedy
,
sortings
1700
x7454
1850H
The Third Letter
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
1700
x7448
515B
Drazil and His Happy Friends
brute force
,
dsu
,
meet-in-the-middle
,
number theory
1300
x7357
659E
New Reform
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
1600
x7292
1845D
Rating System
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
math
,
two pointers
1800
x7280
939D
Love Rescue
dfs and similar
,
dsu
,
graphs
,
greedy
,
strings
1600
x7093
1594D
The Number of Imposters
constructive algorithms
,
dfs and similar
,
dp
,
dsu
,
graphs
1700
x7070
1242B
0-1 MST
dfs and similar
,
dsu
,
graphs
,
sortings
1900
x6953
609E
Minimum spanning tree for each edge
data structures
,
dfs and similar
,
dsu
,
graphs
,
trees
2100
x6907
1609D
Social Network
dsu
,
graphs
,
greedy
,
implementation
,
trees
1600
x6898
1245D
Shichikuji and Power Grid
dsu
,
graphs
,
greedy
,
shortest paths
,
trees
1900
x6865
723D
Lakes in Berland
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
1600
x6801
731C
Socks
dfs and similar
,
dsu
,
graphs
,
greedy
1600
x6766
1213G
Path Queries
divide and conquer
,
dsu
,
graphs
,
sortings
,
trees
1800
x6585
1873H
Mad City
dfs and similar
,
dsu
,
games
,
graphs
,
shortest paths
,
trees
1700
x6511
1859D
Andrey and Escape from Capygrad
binary search
,
data structures
,
dp
,
dsu
,
greedy
,
sortings
1800
x6501
1131F
Asya And Kittens
constructive algorithms
,
dsu
1700
x6199
920F
SUM and REPLACE
brute force
,
data structures
,
dsu
,
number theory
2000
x6191
490B
Queue
dsu
,
implementation
1500
x5896
1095F
Make It Connected
dsu
,
graphs
,
greedy
1900
x5826
1344B
Monopole Magnets
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2000
x5772
920E
Connected Components?
data structures
,
dfs and similar
,
dsu
,
graphs
2100
x5764
1872F
Selling a Menagerie
dfs and similar
,
dsu
,
graphs
,
implementation
,
math
1800
x5749
698B
Fix a Tree
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
trees
1700
x5601
843A
Sorting by Subsequences
dfs and similar
,
dsu
,
implementation
,
math
,
sortings
1400
x5522
1624G
MinOr Tree
bitmasks
,
dfs and similar
,
dsu
,
graphs
,
greedy
1900
x5515
886C
Petya and Catacombs
dsu
,
greedy
,
implementation
,
trees
1300
x5425
13E
Holes
data structures
,
dsu
2700
x5328
371D
Vessels
data structures
,
dsu
,
implementation
,
trees
1800
x5302
691D
Swaps in Permutation
dfs and similar
,
dsu
,
math
1700
x5280
1922D
Berserk Monsters
brute force
,
data structures
,
dsu
,
implementation
,
math
1900
x5140
741B
Arpa's weak amphitheater and Mehrdad's valuable Hoses
dfs and similar
,
dp
,
dsu
1600
x5136
455C
Civilization
dfs and similar
,
dp
,
dsu
,
ternary search
,
trees
2100
x5115
875B
Sorting the Coins
dsu
,
implementation
,
sortings
,
two pointers
1500
x5113
1009F
Dominant Indices
data structures
,
dsu
,
trees
2300
x5073
1920D
Array Repetition
binary search
,
brute force
,
dsu
,
implementation
,
math
1900
x5050
1513D
GCD and MST
constructive algorithms
,
dsu
,
graphs
,
greedy
,
number theory
,
sortings
2000
x5016
472D
Design Tutorial: Inverse the Problem
dfs and similar
,
dsu
,
shortest paths
,
trees
1900
x4987
1833G
Ksyusha and Chinchilla
constructive algorithms
,
dfs and similar
,
dp
,
dsu
,
greedy
,
implementation
,
trees
1800
x4905
1055B
Alice and Hairdresser
dsu
,
implementation
1300
x4892
776D
The Door Problem
2-sat
,
dfs and similar
,
dsu
,
graphs
2000
x4777
1276B
Two Fairs
combinatorics
,
dfs and similar
,
dsu
,
graphs
1900
x4663
17B
Hierarchy
dfs and similar
,
dsu
,
greedy
,
shortest paths
1500
x4457
60B
Serial Time!
dfs and similar
,
dsu
1400
x4432
28B
pSort
dfs and similar
,
dsu
,
graphs
1600
x4390
817D
Imbalanced Array
data structures
,
divide and conquer
,
dsu
,
sortings
1900
x4382
1442B
Identify the Operations
combinatorics
,
data structures
,
dsu
,
greedy
,
implementation
1800
x4295
1857G
Counting Graphs
combinatorics
,
divide and conquer
,
dsu
,
graphs
,
greedy
,
sortings
,
trees
2000
x4050
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