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Before contest
Codeforces Round 943 (Div. 3)
21:02:42
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Difficulty:
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matrices
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
166E
Tetrahedron
dp
,
math
,
matrices
1500
x19916
1699B
Almost Ternary Matrix
bitmasks
,
constructive algorithms
,
matrices
900
x19141
1513C
Add One
dp
,
matrices
1600
x13172
1648A
Weird Sum
combinatorics
,
data structures
,
geometry
,
math
,
matrices
,
sortings
1400
x11704
225C
Barcode
dp
,
matrices
1700
x8742
1557C
Moamen and XOR
bitmasks
,
combinatorics
,
dp
,
math
,
matrices
1700
x8316
485A
Factory
implementation
,
math
,
matrices
1400
x8087
1635D
Infinite Set
bitmasks
,
dp
,
math
,
matrices
,
number theory
,
strings
1800
x5990
337C
Quiz
binary search
,
greedy
,
math
,
matrices
,
number theory
1600
x4768
1188B
Count Pairs
math
,
matrices
,
number theory
,
two pointers
2300
x4210
1117D
Magic Gems
dp
,
math
,
matrices
2100
x4002
1012B
Chemical table
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
matrices
1900
x3647
1332E
Height All the Same
combinatorics
,
constructive algorithms
,
math
,
matrices
2100
x3553
718C
Sasha and Array
data structures
,
math
,
matrices
2300
x3364
582B
Once Again...
constructive algorithms
,
dp
,
matrices
1900
x3302
1538E
Funny Substrings
data structures
,
hashing
,
implementation
,
matrices
,
strings
2100
x2799
621E
Wet Shark and Blocks
dp
,
matrices
2000
x2717
222E
Decoding Genome
dp
,
matrices
1900
x2524
1182E
Product Oriented Recurrence
dp
,
math
,
matrices
,
number theory
2300
x2522
691E
Xor-sequences
matrices
1900
x2354
696C
PLEASE
combinatorics
,
dp
,
implementation
,
math
,
matrices
2000
x2047
1335F
Robots on a Grid
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
matrices
2200
x1961
1023E
Down or Right
constructive algorithms
,
interactive
,
matrices
2100
x1951
959F
Mahmoud and Ehab and yet another xor task
bitmasks
,
dp
,
math
,
matrices
2400
x1939
1609E
William The Oblivious
bitmasks
,
data structures
,
dp
,
matrices
2400
x1836
1252K
Addition Robot
data structures
,
math
,
matrices
2100
x1782
551D
GukiZ and Binary Operations
combinatorics
,
implementation
,
math
,
matrices
,
number theory
2100
x1723
1761E
Make It Connected
binary search
,
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
matrices
,
trees
,
two pointers
2400
x1720
1101G
(Zero XOR Subset)-less
math
,
matrices
2300
x1603
348D
Turtles
dp
,
matrices
2500
x1559
1713E
Cross Swapping
2-sat
,
data structures
,
dsu
,
greedy
,
matrices
2400
x1513
750E
New Year and Old Subsequence
data structures
,
divide and conquer
,
dp
,
matrices
2600
x1464
821E
Okabe and El Psy Kongroo
dp
,
matrices
2100
x1411
1743F
Intersection and Union
data structures
,
dp
,
matrices
,
probabilities
2300
x1407
852B
Neural Network country
dp
,
matrices
2000
x1369
514E
Darth Vader and Tree
dp
,
matrices
2200
x1366
717D
Dexterina’s Lab
games
,
matrices
,
probabilities
1900
x1356
576D
Flights for Regular Customers
dp
,
matrices
2700
x1306
1427E
Xum
bitmasks
,
constructive algorithms
,
math
,
matrices
,
number theory
2500
x1260
1814E
Chain Chips
data structures
,
dp
,
matrices
2300
x1241
696D
Legen...
data structures
,
dp
,
matrices
,
strings
2500
x1219
1458C
Latin Square
math
,
matrices
2700
x1198
1151F
Sonya and Informatics
combinatorics
,
dp
,
matrices
,
probabilities
2300
x1141
1924C
Fractal Origami
geometry
,
math
,
matrices
2400
x1028
632F
Magic Matrix
brute force
,
divide and conquer
,
graphs
,
matrices
,
trees
2400
x1021
780F
Axel and Marston in Bitland
bitmasks
,
dp
,
graphs
,
matrices
2400
x1019
917D
Stranger Trees
dp
,
math
,
matrices
,
trees
2600
x1004
954F
Runner's Problem
dp
,
matrices
,
sortings
2100
x975
1106F
Lunar New Year and a Recursive Sequence
math
,
matrices
,
number theory
2400
x947
1701F
Points
combinatorics
,
data structures
,
implementation
,
math
,
matrices
2500
x881
1967C
Fenwick Tree
combinatorics
,
data structures
,
dp
,
math
,
matrices
x856
891E
Lust
combinatorics
,
math
,
matrices
3000
x843
226C
Anniversary
data structures
,
implementation
,
math
,
matrices
,
number theory
2400
x842
575A
Fibonotci
data structures
,
math
,
matrices
2700
x756
1380F
Strange Addition
data structures
,
dp
,
matrices
2600
x753
147B
Smile House
binary search
,
graphs
,
matrices
2500
x741
837F
Prefix Sums
binary search
,
brute force
,
combinatorics
,
math
,
matrices
2400
x735
1919F2
Wine Factory (Hard Version)
data structures
,
dp
,
flows
,
greedy
,
matrices
2800
x734
1681E
Labyrinth Adventures
data structures
,
dp
,
matrices
,
shortest paths
2600
x698
506E
Mr. Kitayuta's Gift
combinatorics
,
dp
,
matrices
,
strings
3000
x683
113D
Museum
math
,
matrices
,
probabilities
2700
x649
1808E2
Minibuses on Venus (medium version)
combinatorics
,
divide and conquer
,
dp
,
matrices
2500
x645
1844G
Tree Weights
bitmasks
,
constructive algorithms
,
data structures
,
dfs and similar
,
implementation
,
math
,
matrices
,
number theory
,
trees
3000
x637
1895F
Fancy Arrays
combinatorics
,
dp
,
math
,
matrices
2600
x623
1152F2
Neko Rules the Catniverse (Large Version)
bitmasks
,
dp
,
matrices
3000
x591
1616F
Tricolor Triangles
brute force
,
graphs
,
math
,
matrices
2900
x584
1916H1
Matrix Rank (Easy Version)
brute force
,
combinatorics
,
dp
,
math
,
matrices
2700
x582
1411G
No Game No Life
bitmasks
,
games
,
math
,
matrices
2700
x578
392C
Yet Another Number Sequence
combinatorics
,
math
,
matrices
x576
385E
Bear in the Field
math
,
matrices
2300
x559
1286D
LCC
data structures
,
math
,
matrices
,
probabilities
3100
x556
1025E
Colored Cubes
constructive algorithms
,
implementation
,
matrices
2700
x547
167E
Wizards and Bets
dfs and similar
,
graphs
,
math
,
matrices
2900
x545
351C
Jeff and Brackets
dp
,
matrices
2500
x539
946F
Fibonacci String Subsequences
combinatorics
,
dp
,
matrices
2400
x529
578F
Mirror Box
matrices
,
trees
3200
x529
1152F1
Neko Rules the Catniverse (Small Version)
bitmasks
,
dp
,
matrices
2800
x512
1916H2
Matrix Rank (Hard Version)
combinatorics
,
dp
,
math
,
matrices
,
string suffix structures
2700
x500
193C
Hamming Distance
constructive algorithms
,
greedy
,
math
,
matrices
2400
x495
453D
Little Pony and Elements of Harmony
dp
,
matrices
3000
x459
736D
Permutations
math
,
matrices
2800
x450
498E
Stairs and Lines
dp
,
matrices
2700
x448
923E
Perpetual Subtraction
fft
,
math
,
matrices
3100
x435
662A
Gambling Nim
bitmasks
,
math
,
matrices
,
probabilities
2400
x429
1511F
Chainword
brute force
,
data structures
,
dp
,
matrices
,
string suffix structures
,
strings
2700
x417
107D
Crime Management
dp
,
graphs
,
matrices
2400
x400
593E
Strange Calculation and Cats
dp
,
matrices
2400
x399
446D
DZY Loves Games
math
,
matrices
,
probabilities
2800
x378
917C
Pollywog
combinatorics
,
dp
,
matrices
2900
x370
51E
Pentagon
combinatorics
,
graphs
,
matrices
2400
x363
93D
Flags
dp
,
math
,
matrices
2500
x333
193E
Fibonacci Number
brute force
,
math
,
matrices
2900
x321
60E
Mushroom Gnomes
math
,
matrices
2600
x316
1672G
Cross Xor
constructive algorithms
,
graphs
,
math
,
matrices
3200
x313
1698G
Long Binary String
bitmasks
,
math
,
matrices
,
meet-in-the-middle
,
number theory
2900
x300
1662C
European Trip
dp
,
graphs
,
math
,
matrices
x288
497E
Subsequences Return
dp
,
matrices
2900
x281
832E
Vasya and Shifts
matrices
2600
x278
1864H
Asterism Stream
dp
,
math
,
matrices
3200
x269
1344F
Piet's Palette
matrices
3200
x253
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