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Codeforces Round (Div. 2)
3 days
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Difficulty:
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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
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
938G
Shortest Path Queries
bitmasks
,
data structures
,
dsu
,
graphs
2900
x867
938F
Erasing Substrings
bitmasks
,
dp
,
greedy
2700
x474
920G
List Of Integers
binary search
,
bitmasks
,
brute force
,
combinatorics
,
math
,
number theory
2200
x1702
916B
Jamie and Binary Sequence (changed after round)
bitmasks
,
greedy
,
math
2000
x1733
914G
Sum the Fibonacci
bitmasks
,
divide and conquer
,
dp
,
fft
,
math
2600
x904
914F
Substrings in a String
bitmasks
,
brute force
,
data structures
,
string suffix structures
,
strings
3000
x1476
914E
Palindromes in a Tree
bitmasks
,
data structures
,
divide and conquer
,
trees
2400
x1427
913E
Logical Expression
bitmasks
,
dp
,
shortest paths
2400
x761
913C
Party Lemonade
bitmasks
,
dp
,
greedy
1600
x7783
912B
New Year's Eve
bitmasks
,
constructive algorithms
,
number theory
1300
x11664
908E
New Year and Entity Enumeration
bitmasks
,
combinatorics
,
dp
,
math
2500
x745
906C
Party
bitmasks
,
brute force
,
dp
,
graphs
2400
x1187
903F
Clear The Matrix
bitmasks
,
dp
2200
x627
900D
Unusual Sequences
bitmasks
,
combinatorics
,
dp
,
math
,
number theory
2000
x3043
895C
Square Subsets
bitmasks
,
combinatorics
,
dp
,
math
2000
x5225
888G
Xor-MST
bitmasks
,
constructive algorithms
,
data structures
2300
x4033
888E
Maximum Subsequence
bitmasks
,
divide and conquer
,
meet-in-the-middle
1800
x6826
878D
Magic Breeding
bitmasks
2900
x645
878A
Short Program
bitmasks
,
constructive algorithms
1600
x5340
877E
Danil and a Part-time Job
bitmasks
,
data structures
,
trees
2000
x4308
875D
High Cry
binary search
,
bitmasks
,
combinatorics
,
data structures
,
divide and conquer
2200
x2076
868D
Huge Strings
bitmasks
,
brute force
,
dp
,
implementation
,
strings
2200
x894
868C
Qualification Rounds
bitmasks
,
brute force
,
constructive algorithms
,
dp
1500
x4573
865F
Egg Roulette
bitmasks
,
brute force
,
divide and conquer
,
math
,
meet-in-the-middle
3300
x68
865E
Hex Dyslexia
bitmasks
,
brute force
,
dp
,
graphs
3300
x120
855E
Salazar Slytherin's Locket
bitmasks
,
dp
2200
x1673
850E
Random Elections
bitmasks
,
brute force
,
divide and conquer
,
fft
,
math
2800
x382
850C
Arpa and a game with Mojtaba
bitmasks
,
dp
,
games
2200
x1389
845F
Guards In The Storehouse
bitmasks
,
dp
2500
x427
817E
Choosing The Commander
bitmasks
,
data structures
,
trees
2000
x2754
812B
Sagheer, the Hausmeister
bitmasks
,
brute force
,
dp
1600
x5123
803F
Coprime Subsequences
bitmasks
,
combinatorics
,
number theory
2000
x3095
796F
Sequence Recovery
bitmasks
,
data structures
,
greedy
2800
x173
792D
Paths in a Complete Binary Tree
bitmasks
,
trees
1900
x2923
780F
Axel and Marston in Bitland
bitmasks
,
dp
,
graphs
,
matrices
2400
x1030
778B
Bitwise Formula
bitmasks
,
brute force
,
dfs and similar
,
expression parsing
,
implementation
1800
x2280
776G
Sherlock and the Encrypted Data
bitmasks
,
combinatorics
,
dp
2900
x335
772D
Varying Kibibits
bitmasks
,
dp
2700
x575
769D
k-Interesting Pairs Of Integers
*special problem
,
bitmasks
,
brute force
,
meet-in-the-middle
1700
x2259
768E
Game of Stones
bitmasks
,
dp
,
games
2100
x2713
766E
Mahmoud and a xor trip
bitmasks
,
constructive algorithms
,
data structures
,
dfs and similar
,
dp
,
math
,
trees
2100
x2901
757D
Felicity's Big Secret Revealed
bitmasks
,
dp
2200
x1279
755F
PolandBall and Gifts
bitmasks
,
dp
,
greedy
2600
x1292
754E
Dasha and cyclic table
bitmasks
,
brute force
,
fft
,
strings
,
trees
2600
x486
750G
New Year and Binary Tree Paths
bitmasks
,
brute force
,
combinatorics
,
dp
3200
x444
744C
Hongcow Buys a Deck of Cards
bitmasks
,
brute force
,
dp
2400
x1030
744B
Hongcow's Game
bitmasks
,
divide and conquer
,
interactive
1900
x1710
743E
Vladik and cards
binary search
,
bitmasks
,
brute force
,
dp
2200
x1484
743B
Chloe and the sequence
binary search
,
bitmasks
,
constructive algorithms
,
implementation
1200
x14394
734F
Anton and School
bitmasks
,
constructive algorithms
,
implementation
,
math
2500
x1283
724G
Xor-matic Number of the Graph
bitmasks
,
graphs
,
math
,
number theory
,
trees
2600
x1009
718E
Matvey's Birthday
bitmasks
,
graphs
3300
x350
707D
Persistent Bookcase
bitmasks
,
data structures
,
dfs and similar
,
implementation
2200
x2624
706D
Vasiliy's Multiset
binary search
,
bitmasks
,
data structures
,
trees
1800
x9651
698C
LRU
bitmasks
,
dp
,
math
,
probabilities
2400
x1284
685E
Travelling Through the Snow Queen's Kingdom
bitmasks
,
brute force
,
divide and conquer
,
graphs
2800
x506
678E
Another Sith Tournament
bitmasks
,
dp
,
math
,
probabilities
2200
x2010
677C
Vanya and Label
bitmasks
,
combinatorics
,
implementation
,
strings
1500
x6325
662C
Binary Table
bitmasks
,
brute force
,
divide and conquer
,
dp
,
fft
,
math
2600
x1977
662A
Gambling Nim
bitmasks
,
math
,
matrices
,
probabilities
2400
x430
633G
Yash And Trees
bitmasks
,
data structures
,
dfs and similar
,
math
,
number theory
2800
x763
620E
New Year Tree
bitmasks
,
data structures
,
trees
2100
x5341
611B
New Year and Old Property
bitmasks
,
brute force
,
implementation
1300
x9905
599E
Sandy and Nuts
bitmasks
,
dp
,
trees
2600
x626
582E
Boolean Function
bitmasks
,
dp
,
expression parsing
3000
x481
581D
Three Logos
bitmasks
,
brute force
,
constructive algorithms
,
geometry
,
implementation
,
math
1700
x3515
580D
Kefa and Dishes
bitmasks
,
dp
1800
x9360
579A
Raising Bacteria
bitmasks
1000
x58124
575C
Party
bitmasks
,
brute force
,
graph matchings
2700
x218
570D
Tree Requests
binary search
,
bitmasks
,
constructive algorithms
,
dfs and similar
,
graphs
,
trees
2200
x6801
566E
Restoring Map
bitmasks
,
constructive algorithms
,
trees
3200
x603
550B
Preparing Olympiad
bitmasks
,
brute force
1400
x20079
547C
Mike and Foam
bitmasks
,
combinatorics
,
dp
,
math
,
number theory
2300
x2749
543C
Remembering Strings
bitmasks
,
dp
2500
x1369
535B
Tavas and SaDDas
bitmasks
,
brute force
,
combinatorics
,
implementation
1100
x22002
534F
Simplified Nonogram
bitmasks
,
dp
,
hashing
,
meet-in-the-middle
2400
x445
528D
Fuzzy Search
bitmasks
,
brute force
,
fft
2500
x2102
525E
Anya and Cubes
binary search
,
bitmasks
,
brute force
,
dp
,
math
,
meet-in-the-middle
2100
x2961
513C
Second price auction
bitmasks
,
probabilities
2000
x1526
513B2
Permutations
bitmasks
,
divide and conquer
,
math
1800
x2571
510D
Fox And Jumping
bitmasks
,
brute force
,
dp
,
math
1900
x5237
504D
Misha and XOR
bitmasks
2700
x300
484A
Bits
bitmasks
,
constructive algorithms
1700
x10933
482C
Game with Strings
bitmasks
,
dp
,
probabilities
2600
x886
476B
Dreamoon and WiFi
bitmasks
,
brute force
,
combinatorics
,
dp
,
math
,
probabilities
1300
x29651
472G
Design Tutorial: Increase the Constraints
bitmasks
,
data structures
,
fft
2800
x394
467B
Fedor and New Game
bitmasks
,
brute force
,
constructive algorithms
,
implementation
1100
x36667
453B
Little Pony and Harmony Chest
bitmasks
,
brute force
,
dp
2000
x4591
451E
Devu and Flowers
bitmasks
,
combinatorics
,
number theory
2300
x3373
449D
Jzzhu and Numbers
bitmasks
,
combinatorics
,
dp
2400
x4172
442A
Borya and Hanabi
bitmasks
,
brute force
,
implementation
1700
x2098
441E
Valera and Number
bitmasks
,
dp
,
math
,
probabilities
2400
x682
437B
The Child and Set
bitmasks
,
greedy
,
implementation
,
sortings
1500
x9297
431D
Random Task
binary search
,
bitmasks
,
combinatorics
,
dp
,
math
2100
x2287
429C
Guess the Tree
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
trees
2300
x932
425B
Sereja and Table
bitmasks
,
greedy
2200
x1284
417D
Cunning Gena
bitmasks
,
dp
,
greedy
,
sortings
1900
x2392
413D
2048
bitmasks
,
dp
2000
x777
401D
Roman and Numbers
bitmasks
,
brute force
,
combinatorics
,
dp
,
number theory
2000
x4018
400E
Inna and Binary Logic
binary search
,
bitmasks
,
data structures
2100
x938
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