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Before contest
Codeforces Round 941 (Div. 1)
2 days
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*has extra registration
Before contest
Codeforces Round 941 (Div. 2)
2 days
Register now »
*has extra registration
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bitmasks
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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probabilities
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Problems
#
Name
895C
Square Subsets
bitmasks
,
combinatorics
,
dp
,
math
2000
x5102
888G
Xor-MST
bitmasks
,
constructive algorithms
,
data structures
2300
x3871
888E
Maximum Subsequence
bitmasks
,
divide and conquer
,
meet-in-the-middle
1800
x6572
878D
Magic Breeding
bitmasks
2900
x640
878A
Short Program
bitmasks
,
constructive algorithms
1600
x5257
877E
Danil and a Part-time Job
bitmasks
,
data structures
,
trees
2000
x4229
875D
High Cry
binary search
,
bitmasks
,
combinatorics
,
data structures
,
divide and conquer
2200
x1967
868D
Huge Strings
bitmasks
,
brute force
,
dp
,
implementation
,
strings
2200
x890
868C
Qualification Rounds
bitmasks
,
brute force
,
constructive algorithms
,
dp
1500
x4520
865F
Egg Roulette
bitmasks
,
brute force
,
divide and conquer
,
math
,
meet-in-the-middle
3300
x67
865E
Hex Dyslexia
bitmasks
,
brute force
,
dp
,
graphs
3300
x118
855E
Salazar Slytherin's Locket
bitmasks
,
dp
2200
x1606
850E
Random Elections
bitmasks
,
brute force
,
divide and conquer
,
fft
,
math
2800
x378
850C
Arpa and a game with Mojtaba
bitmasks
,
dp
,
games
2200
x1368
845F
Guards In The Storehouse
bitmasks
,
dp
2500
x415
817E
Choosing The Commander
bitmasks
,
data structures
,
trees
2000
x2680
812B
Sagheer, the Hausmeister
bitmasks
,
brute force
,
dp
1600
x5068
803F
Coprime Subsequences
bitmasks
,
combinatorics
,
number theory
2000
x2981
796F
Sequence Recovery
bitmasks
,
data structures
,
greedy
2800
x169
792D
Paths in a Complete Binary Tree
bitmasks
,
trees
1900
x2896
780F
Axel and Marston in Bitland
bitmasks
,
dp
,
graphs
,
matrices
2400
x1018
778B
Bitwise Formula
bitmasks
,
brute force
,
dfs and similar
,
expression parsing
,
implementation
1800
x2253
776G
Sherlock and the Encrypted Data
bitmasks
,
combinatorics
,
dp
2900
x327
772D
Varying Kibibits
bitmasks
,
dp
2700
x565
769D
k-Interesting Pairs Of Integers
*special problem
,
bitmasks
,
brute force
,
meet-in-the-middle
1700
x2208
768E
Game of Stones
bitmasks
,
dp
,
games
2100
x2626
766E
Mahmoud and a xor trip
bitmasks
,
constructive algorithms
,
data structures
,
dfs and similar
,
dp
,
math
,
trees
2100
x2802
757D
Felicity's Big Secret Revealed
bitmasks
,
dp
2200
x1267
755F
PolandBall and Gifts
bitmasks
,
dp
,
greedy
2600
x1267
754E
Dasha and cyclic table
bitmasks
,
brute force
,
fft
,
strings
,
trees
2600
x479
750G
New Year and Binary Tree Paths
bitmasks
,
brute force
,
combinatorics
,
dp
3200
x439
744C
Hongcow Buys a Deck of Cards
bitmasks
,
brute force
,
dp
2400
x1001
744B
Hongcow's Game
bitmasks
,
divide and conquer
,
interactive
1900
x1706
743E
Vladik and cards
binary search
,
bitmasks
,
brute force
,
dp
2200
x1468
743B
Chloe and the sequence
binary search
,
bitmasks
,
constructive algorithms
,
implementation
1200
x14200
734F
Anton and School
bitmasks
,
constructive algorithms
,
implementation
,
math
2500
x1277
724G
Xor-matic Number of the Graph
bitmasks
,
graphs
,
math
,
number theory
,
trees
2600
x992
718E
Matvey's Birthday
bitmasks
,
graphs
3300
x332
707D
Persistent Bookcase
bitmasks
,
data structures
,
dfs and similar
,
implementation
2200
x2592
706D
Vasiliy's Multiset
binary search
,
bitmasks
,
data structures
,
trees
1800
x9226
698C
LRU
bitmasks
,
dp
,
math
,
probabilities
2400
x1273
685E
Travelling Through the Snow Queen's Kingdom
bitmasks
,
brute force
,
divide and conquer
,
graphs
2800
x502
678E
Another Sith Tournament
bitmasks
,
dp
,
math
,
probabilities
2200
x1896
677C
Vanya and Label
bitmasks
,
combinatorics
,
implementation
,
strings
1500
x6270
662C
Binary Table
bitmasks
,
brute force
,
divide and conquer
,
dp
,
fft
,
math
2600
x1939
662A
Gambling Nim
bitmasks
,
math
,
matrices
,
probabilities
2400
x429
633G
Yash And Trees
bitmasks
,
data structures
,
dfs and similar
,
math
,
number theory
2800
x712
620E
New Year Tree
bitmasks
,
data structures
,
trees
2100
x5163
611B
New Year and Old Property
bitmasks
,
brute force
,
implementation
1300
x9755
599E
Sandy and Nuts
bitmasks
,
dp
,
trees
2600
x616
582E
Boolean Function
bitmasks
,
dp
,
expression parsing
3000
x475
581D
Three Logos
bitmasks
,
brute force
,
constructive algorithms
,
geometry
,
implementation
,
math
1700
x3411
580D
Kefa and Dishes
bitmasks
,
dp
1800
x9119
579A
Raising Bacteria
bitmasks
1000
x55797
575C
Party
bitmasks
,
brute force
,
graph matchings
2700
x211
570D
Tree Requests
binary search
,
bitmasks
,
constructive algorithms
,
dfs and similar
,
graphs
,
trees
2200
x6620
566E
Restoring Map
bitmasks
,
constructive algorithms
,
trees
3200
x600
550B
Preparing Olympiad
bitmasks
,
brute force
1400
x19371
547C
Mike and Foam
bitmasks
,
combinatorics
,
dp
,
math
,
number theory
2300
x2700
543C
Remembering Strings
bitmasks
,
dp
2500
x1346
535B
Tavas and SaDDas
bitmasks
,
brute force
,
combinatorics
,
implementation
1100
x21545
534F
Simplified Nonogram
bitmasks
,
dp
,
hashing
,
meet-in-the-middle
2400
x438
528D
Fuzzy Search
bitmasks
,
brute force
,
fft
2500
x2044
525E
Anya and Cubes
binary search
,
bitmasks
,
brute force
,
dp
,
math
,
meet-in-the-middle
2100
x2722
513C
Second price auction
bitmasks
,
probabilities
2000
x1516
513B2
Permutations
bitmasks
,
divide and conquer
,
math
1800
x2561
510D
Fox And Jumping
bitmasks
,
brute force
,
dp
,
math
1900
x5165
504D
Misha and XOR
bitmasks
2700
x297
484A
Bits
bitmasks
,
constructive algorithms
1700
x10654
482C
Game with Strings
bitmasks
,
dp
,
probabilities
2600
x870
476B
Dreamoon and WiFi
bitmasks
,
brute force
,
combinatorics
,
dp
,
math
,
probabilities
1300
x28932
472G
Design Tutorial: Increase the Constraints
bitmasks
,
data structures
,
fft
2800
x391
467B
Fedor and New Game
bitmasks
,
brute force
,
constructive algorithms
,
implementation
1100
x35665
453B
Little Pony and Harmony Chest
bitmasks
,
brute force
,
dp
2000
x4516
451E
Devu and Flowers
bitmasks
,
combinatorics
,
number theory
2300
x3212
449D
Jzzhu and Numbers
bitmasks
,
combinatorics
,
dp
2400
x4051
442A
Borya and Hanabi
bitmasks
,
brute force
,
implementation
1700
x2092
441E
Valera and Number
bitmasks
,
dp
,
math
,
probabilities
2400
x669
437B
The Child and Set
bitmasks
,
greedy
,
implementation
,
sortings
1500
x9131
431D
Random Task
binary search
,
bitmasks
,
combinatorics
,
dp
,
math
2100
x2103
429C
Guess the Tree
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
trees
2300
x900
425B
Sereja and Table
bitmasks
,
greedy
2200
x1280
417D
Cunning Gena
bitmasks
,
dp
,
greedy
,
sortings
1900
x2371
413D
2048
bitmasks
,
dp
2000
x749
401D
Roman and Numbers
bitmasks
,
brute force
,
combinatorics
,
dp
,
number theory
2000
x3963
400E
Inna and Binary Logic
binary search
,
bitmasks
,
data structures
2100
x931
388B
Fox and Minimal path
bitmasks
,
constructive algorithms
,
graphs
,
implementation
,
math
1900
x2431
385D
Bear and Floodlight
bitmasks
,
dp
,
geometry
2200
x794
379D
New Year Letter
bitmasks
,
brute force
,
dp
2000
x1482
377C
Captains Mode
bitmasks
,
dp
,
games
2200
x1102
375C
Circling Round Treasures
bitmasks
,
shortest paths
2600
x470
367D
Sereja and Sets
bitmasks
,
dfs and similar
2400
x616
356D
Bags and Coins
bitmasks
,
constructive algorithms
,
dp
,
greedy
2700
x936
354B
Game with Strings
bitmasks
,
dp
,
games
2400
x448
342D
Xenia and Dominoes
bitmasks
,
dfs and similar
,
dp
2100
x487
336E
Vasily the Bear and Painting Square
bitmasks
,
combinatorics
,
dp
,
implementation
2700
x109
333E
Summer Earnings
binary search
,
bitmasks
,
brute force
,
geometry
,
sortings
2500
x1066
333D
Characteristics of Rectangles
binary search
,
bitmasks
,
brute force
,
implementation
,
sortings
2100
x1844
327E
Axis Walking
bitmasks
,
combinatorics
,
constructive algorithms
,
dp
,
meet-in-the-middle
2300
x1340
309C
Memory for Arrays
binary search
,
bitmasks
,
greedy
1900
x1286
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