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Before contest
Codeforces Round (Div. 3)
7 days
→ Filter Problems
Difficulty:
—
data structures
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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Custom test
Problems
#
Name
799F
Beautiful fountains rows
data structures
3500
x426
798E
Mike and code of a permutation
constructive algorithms
,
data structures
,
graphs
,
sortings
3000
x464
796F
Sequence Recovery
bitmasks
,
data structures
,
greedy
2800
x173
794F
Leha and security system
data structures
2800
x738
793G
Oleg and chess
data structures
,
divide and conquer
,
flows
,
graph matchings
3400
x364
793F
Julia the snail
data structures
,
divide and conquer
,
dp
3000
x523
792F
Mages and Monsters
data structures
,
geometry
3100
x201
788E
New task
data structures
2900
x332
786E
ALT
data structures
,
flows
,
graphs
,
trees
3200
x609
786D
Rap God
data structures
,
dfs and similar
,
hashing
,
strings
,
trees
3400
x138
780G
Andryusha and Nervous Barriers
data structures
,
dp
2700
x650
776F
Sherlock's bet to Moriarty
constructive algorithms
,
data structures
,
divide and conquer
,
geometry
,
graphs
,
implementation
,
trees
2800
x420
773E
Blog Post Rating
data structures
,
sortings
3000
x335
768G
The Winds of Winter
binary search
,
data structures
3300
x355
765F
Souvenirs
data structures
3100
x1889
763E
Timofey and our friends animals
data structures
,
divide and conquer
,
dsu
2900
x476
763D
Timofey and a flat tree
data structures
,
graphs
,
hashing
,
shortest paths
,
trees
2900
x523
757G
Can Bash Save the Day?
data structures
,
divide and conquer
,
graphs
,
trees
3400
x484
757F
Team Rocket Rises Again
data structures
,
graphs
,
shortest paths
2800
x1108
741E
Arpa’s abnormal DNA and Mehrdad’s deep interest
data structures
,
string suffix structures
3400
x176
741D
Arpa’s letter-marked tree and Mehrdad’s Dokhtar-kosh paths
data structures
,
dfs and similar
,
trees
2900
x2481
739E
Gosha is hunting
brute force
,
data structures
,
dp
,
flows
,
math
,
probabilities
,
sortings
3000
x2077
730L
Expression Queries
data structures
3200
x85
722F
Cyclic Cipher
chinese remainder theorem
,
data structures
,
implementation
,
number theory
,
two pointers
2800
x474
720F
Array Covering
data structures
3100
x145
720D
Slalom
data structures
,
dp
,
sortings
3100
x225
713D
Animals and Puzzle
binary search
,
data structures
2700
x1085
704E
Iron Man
data structures
,
geometry
,
trees
3300
x279
702F
T-Shirts
data structures
2800
x1206
700D
Huffman Coding on Segment
data structures
,
greedy
3100
x455
696E
...Wait for it...
data structures
,
dsu
,
trees
3000
x492
679E
Bear and Bad Powers of 42
data structures
3100
x671
671E
Organizing a Race
data structures
,
greedy
3300
x397
671D
Roads in Yusland
data structures
,
dp
,
greedy
2900
x1113
671C
Ultimate Weirdness of an Array
data structures
,
number theory
2800
x665
666E
Forensic Examination
data structures
,
string suffix structures
3100
x1340
650E
Clockwork Bomb
data structures
,
dfs and similar
,
dsu
,
greedy
,
trees
3200
x588
643G
Choosing Ads
data structures
3200
x925
639F
Bear and Chemistry
data structures
,
dfs and similar
,
graphs
,
trees
3300
x395
633H
Fibonacci-ish II
data structures
,
implementation
3100
x579
633G
Yash And Trees
bitmasks
,
data structures
,
dfs and similar
,
math
,
number theory
2800
x761
626G
Raffles
data structures
,
dp
,
greedy
,
math
3100
x520
625E
Frog Fights
data structures
,
greedy
2800
x324
620F
Xors on Segments
data structures
,
strings
,
trees
2800
x707
603E
Pastoral Oddities
data structures
,
divide and conquer
,
dsu
,
math
,
trees
3000
x1180
601E
A Museum Robbery
data structures
,
dp
2800
x813
587F
Duff is Mad
data structures
,
strings
3000
x1000
587E
Duff as a Queen
data structures
2900
x690
576E
Painting Edges
binary search
,
data structures
3300
x1131
575I
Robots protection
data structures
2800
x423
575A
Fibonotci
data structures
,
math
,
matrices
2700
x770
573E
Bear and Bowling
data structures
,
greedy
3200
x1435
573D
Bear and Cavalry
data structures
,
divide and conquer
,
dp
3000
x454
571D
Campus
binary search
,
data structures
,
dsu
,
trees
3100
x652
568E
Longest Increasing Subsequence
data structures
,
dp
3000
x579
549F
Yura and Developers
data structures
,
divide and conquer
2800
x853
547E
Mike and Friends
data structures
,
string suffix structures
,
strings
,
trees
2800
x1957
543E
Listening to Music
constructive algorithms
,
data structures
3200
x281
542B
Duck Hunt
data structures
3100
x190
538H
Summer Dichotomy
2-sat
,
data structures
,
dfs and similar
,
greedy
3200
x631
536E
Tavas on the Path
data structures
,
divide and conquer
,
trees
3100
x376
533D
Landmarks
data structures
,
dp
3000
x218
533A
Berland Miners
binary search
,
data structures
,
dfs and similar
,
greedy
,
trees
3000
x377
526F
Pudding Monsters
data structures
,
divide and conquer
3000
x2352
524F
And Yet Another Bracket Sequence
data structures
,
greedy
,
hashing
,
string suffix structures
,
strings
2700
x523
494E
Sharti
data structures
,
games
3200
x309
494D
Birthday
data structures
,
dfs and similar
,
dp
,
trees
2700
x518
487E
Tourists
data structures
,
dfs and similar
,
graphs
,
trees
3200
x2165
487D
Conveyor Belts
data structures
2700
x841
482E
ELCA
data structures
,
trees
3200
x176
480E
Parking Lot
data structures
,
divide and conquer
2800
x517
477E
Dreamoon and Notepad
data structures
3100
x132
475F
Meta-universe
data structures
2900
x227
472G
Design Tutorial: Increase the Constraints
bitmasks
,
data structures
,
fft
2800
x394
471E
MUH and Lots and Lots of Segments
data structures
,
dsu
2700
x81
464E
The Classic Problem
data structures
,
graphs
,
shortest paths
3000
x1349
455E
Function
data structures
2900
x662
455D
Serega and Fun
data structures
2700
x2838
453E
Little Pony and Lord Tirek
data structures
3100
x671
452F
Permutation
data structures
,
divide and conquer
,
hashing
2700
x1396
436F
Banners
brute force
,
data structures
,
dp
3000
x369
418E
Tricky Password
data structures
3100
x299
418D
Big Problems for Organizers
data structures
,
graphs
,
trees
2800
x470
414E
Mashmokh's Designed Problem
data structures
3200
x192
407E
k-d-sequence
data structures
3100
x692
403E
Two Rooted Trees
data structures
,
implementation
,
trees
2900
x203
351D
Jeff and Removing Periods
data structures
2700
x1019
331D3
Escaping on Beaveractor
data structures
,
implementation
,
trees
3000
x171
319E
Ping-Pong
data structures
3000
x634
297E
Mystic Carvings
data structures
3000
x354
293E
Close Vertices
data structures
,
divide and conquer
,
trees
2700
x1304
283E
Cow Tennis Tournament
combinatorics
,
data structures
,
math
2800
x721
280E
Sequence Transformation
brute force
,
data structures
,
dp
,
implementation
,
math
3000
x200
280D
k-Maximum Subsequence Sum
data structures
,
flows
,
graphs
,
implementation
2800
x1211
274E
Mirror Room
data structures
,
implementation
3000
x303
264E
Roadside Trees
data structures
,
dp
3000
x397
249D
Donkey and Stars
data structures
,
dp
,
geometry
,
math
,
sortings
2700
x399
243E
Matrix
data structures
3000
x172
243D
Cubes
data structures
,
dp
,
geometry
,
two pointers
2700
x211
241B
Friends
binary search
,
bitmasks
,
data structures
,
math
2700
x758
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