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Before contest
Codeforces Round 941 (Div. 1)
15:25:17
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*has extra registration
Before contest
Codeforces Round 941 (Div. 2)
15:25:17
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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
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
977E
Cyclic Components
dfs and similar
,
dsu
,
graphs
1500
x19142
962G
Visible Black Areas
data structures
,
dsu
,
geometry
,
trees
2800
x125
959B
Mahmoud and Ehab and the message
dsu
,
greedy
,
implementation
1200
x9073
939D
Love Rescue
dfs and similar
,
dsu
,
graphs
,
greedy
,
strings
1600
x7098
938G
Shortest Path Queries
bitmasks
,
data structures
,
dsu
,
graphs
2900
x857
936E
Iqea
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
shortest paths
,
trees
3400
x182
920F
SUM and REPLACE
brute force
,
data structures
,
dsu
,
number theory
2000
x6191
920E
Connected Components?
data structures
,
dfs and similar
,
dsu
,
graphs
2100
x5766
915F
Imbalance Value of a Tree
data structures
,
dsu
,
graphs
,
trees
2400
x2299
902B
Coloring a Tree
dfs and similar
,
dsu
,
greedy
1200
x10450
901C
Bipartite Segments
binary search
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
two pointers
2300
x1131
899E
Segments Removal
data structures
,
dsu
,
flows
,
implementation
,
two pointers
2000
x2732
896E
Welcome home, Chtholly
data structures
,
dsu
3100
x1960
891C
Envy
data structures
,
dsu
,
graphs
2300
x2212
886C
Petya and Catacombs
dsu
,
greedy
,
implementation
,
trees
1300
x5425
884E
Binary Matrix
dsu
2500
x668
875F
Royal Questions
dsu
,
graphs
,
greedy
2500
x1247
875B
Sorting the Coins
dsu
,
implementation
,
sortings
,
two pointers
1500
x5114
873F
Forbidden Indices
dsu
,
string suffix structures
,
strings
2400
x1287
870E
Points, Lines and Ready-made Titles
dfs and similar
,
dsu
,
graphs
,
trees
2300
x974
859E
Desk Disorder
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
trees
2100
x1640
843A
Sorting by Subsequences
dfs and similar
,
dsu
,
implementation
,
math
,
sortings
1400
x5522
817D
Imbalanced Array
data structures
,
divide and conquer
,
dsu
,
sortings
1900
x4383
813F
Bipartite Checking
data structures
,
dsu
,
graphs
2500
x1210
811E
Vladik and Entertaining Flags
data structures
,
dsu
,
graphs
2600
x835
788B
Weird journey
combinatorics
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2100
x2279
778C
Peterson Polyglot
brute force
,
dfs and similar
,
dsu
,
hashing
,
strings
,
trees
2500
x852
776D
The Door Problem
2-sat
,
dfs and similar
,
dsu
,
graphs
2000
x4779
771A
Bear and Friendship Condition
dfs and similar
,
dsu
,
graphs
1500
x14591
766D
Mahmoud and a Dictionary
data structures
,
dfs and similar
,
dp
,
dsu
,
graphs
2000
x3260
765D
Artsem and Saunders
constructive algorithms
,
dsu
,
math
1700
x2440
763E
Timofey and our friends animals
data structures
,
divide and conquer
,
dsu
2900
x475
763A
Timofey and a tree
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
trees
1600
x10080
755C
PolandBall and Forest
dfs and similar
,
dsu
,
graphs
,
interactive
,
trees
1300
x11401
750H
New Year and Snowy Grid
dfs and similar
,
dsu
,
graphs
,
interactive
3500
x187
741B
Arpa's weak amphitheater and Mehrdad's valuable Hoses
dfs and similar
,
dp
,
dsu
1600
x5136
733F
Drivers Dissatisfaction
data structures
,
dsu
,
graphs
,
trees
2200
x1088
731C
Socks
dfs and similar
,
dsu
,
graphs
,
greedy
1600
x6766
723F
st-Spanning Tree
dsu
,
graphs
,
greedy
,
implementation
2300
x1438
723D
Lakes in Berland
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
1600
x6802
722C
Destroying Array
data structures
,
dsu
1600
x8802
715C
Digit Tree
dfs and similar
,
divide and conquer
,
dsu
,
trees
2700
x1915
698B
Fix a Tree
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
trees
1700
x5601
696E
...Wait for it...
data structures
,
dsu
,
trees
3000
x476
691D
Swaps in Permutation
dfs and similar
,
dsu
,
math
1700
x5281
687D
Dividing Kingdom II
brute force
,
data structures
,
dsu
,
graphs
,
sortings
2500
x849
679C
Bear and Square Grid
dfs and similar
,
dsu
,
implementation
2400
x1129
670E
Correct Bracket Sequence Editor
data structures
,
dsu
,
strings
1700
x3139
659F
Polycarp and Hay
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
2000
x1748
659E
New Reform
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
1600
x7295
653E
Bear and Forgotten Tree 2
dfs and similar
,
dsu
,
graphs
,
trees
2400
x1376
652E
Pursuit For Artifacts
dfs and similar
,
dsu
,
graphs
,
trees
2300
x1946
650E
Clockwork Bomb
data structures
,
dfs and similar
,
dsu
,
greedy
,
trees
3200
x585
650C
Table Compression
dfs and similar
,
dp
,
dsu
,
graphs
,
greedy
2200
x1939
627F
Island Puzzle
dfs and similar
,
dsu
,
graphs
,
trees
3400
x231
609E
Minimum spanning tree for each edge
data structures
,
dfs and similar
,
dsu
,
graphs
,
trees
2100
x6910
603E
Pastoral Oddities
data structures
,
divide and conquer
,
dsu
,
math
,
trees
3000
x1150
603B
Moodular Arithmetic
combinatorics
,
dfs and similar
,
dsu
,
math
,
number theory
1800
x2533
601D
Acyclic Organic Compounds
data structures
,
dfs and similar
,
dsu
,
hashing
,
strings
,
trees
2400
x1088
600E
Lomsat gelral
data structures
,
dfs and similar
,
dsu
,
trees
2300
x12598
571D
Campus
binary search
,
data structures
,
dsu
,
trees
3100
x647
566D
Restructuring Company
data structures
,
dsu
1900
x3087
553C
Love Triangles
dfs and similar
,
dsu
,
graphs
2200
x1725
547B
Mike and Feet
binary search
,
data structures
,
dp
,
dsu
1900
x8189
516D
Drazil and Morning Exercise
dfs and similar
,
dp
,
dsu
,
trees
,
two pointers
2800
x1222
515B
Drazil and His Happy Friends
brute force
,
dsu
,
meet-in-the-middle
,
number theory
1300
x7357
506D
Mr. Kitayuta's Colorful Graph
brute force
,
dfs and similar
,
dsu
,
graphs
2400
x2023
505B
Mr. Kitayuta's Colorful Graph
dfs and similar
,
dp
,
dsu
,
graphs
1400
x12066
501B
Misha and Changing Handles
data structures
,
dsu
,
strings
1100
x15567
500E
New Year Domino
data structures
,
dp
,
dsu
2300
x1389
500B
New Year Permutation
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
,
sortings
1600
x8683
490B
Queue
dsu
,
implementation
1500
x5896
472D
Design Tutorial: Inverse the Problem
dfs and similar
,
dsu
,
shortest paths
,
trees
1900
x4989
471E
MUH and Lots and Lots of Segments
data structures
,
dsu
2700
x80
468B
Two Sets
2-sat
,
dfs and similar
,
dsu
,
graph matchings
,
greedy
2000
x3791
466E
Information Graph
dfs and similar
,
dsu
,
graphs
,
trees
2100
x2055
461D
Appleman and Complicated Task
dsu
,
math
2800
x355
455C
Civilization
dfs and similar
,
dp
,
dsu
,
ternary search
,
trees
2100
x5120
452E
Three strings
data structures
,
dsu
,
string suffix structures
,
strings
2400
x1025
445B
DZY Loves Chemistry
dfs and similar
,
dsu
,
greedy
1400
x12071
444E
DZY Loves Planting
binary search
,
dsu
,
trees
2700
x742
441D
Valera and Swaps
constructive algorithms
,
dsu
,
graphs
,
implementation
,
math
,
string suffix structures
2100
x1059
437D
The Child and Zoo
dsu
,
sortings
1900
x3132
436C
Dungeons and Candies
dsu
,
graphs
,
greedy
,
trees
1800
x2578
433D
Nanami's Digital Board
dsu
,
implementation
2000
x1036
409H
A + B Strikes Back
*special problem
,
brute force
,
constructive algorithms
,
dsu
,
implementation
1500
x8656
400D
Dima and Bacteria
dsu
,
graphs
,
shortest paths
2000
x2795
374E
Inna and Babies
binary search
,
data structures
,
dsu
,
geometry
,
implementation
2600
x178
371D
Vessels
data structures
,
dsu
,
implementation
,
trees
1800
x5302
366D
Dima and Trap Graph
binary search
,
data structures
,
dfs and similar
,
dsu
,
shortest paths
,
two pointers
2000
x1270
362D
Fools and Foolproof Roads
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
2100
x895
358E
Dima and Kicks
brute force
,
dsu
,
graphs
,
implementation
2300
x386
356A
Knight Tournament
data structures
,
dsu
1500
x12714
325E
The Red Button
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
greedy
2800
x745
325D
Reclamation
dsu
2900
x484
313E
Ilya and Two Numbers
constructive algorithms
,
data structures
,
dsu
,
greedy
2300
x540
292D
Connected Components
data structures
,
dfs and similar
,
dp
,
dsu
1900
x2303
277A
Learning Languages
dfs and similar
,
dsu
1400
x18070
260D
Black and White Tree
constructive algorithms
,
dsu
,
graphs
,
greedy
,
trees
2100
x1309
228E
The Road to Berland is Paved With Good Intentions
2-sat
,
dfs and similar
,
dsu
,
graphs
1900
x2331
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