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Codeforces Round 940 (Div. 2)
3 days
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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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Custom test
Problems
#
Name
1599E
Two Arrays
data structures
,
matrices
3200
x65
1375I
Cubic Lattice
geometry
,
math
,
matrices
,
number theory
3500
x75
1540E
Tasty Dishes
math
,
matrices
3500
x97
1266H
Red-Blue Graph
dp
,
graphs
,
math
,
matrices
,
meet-in-the-middle
3400
x98
1184D2
Parallel Universes (Hard)
math
,
matrices
3100
x101
446E
DZY Loves Bridges
math
,
matrices
3100
x117
865G
Flowers and Chocolate
combinatorics
,
math
,
matrices
3300
x129
267C
Berland Traffic
math
,
matrices
2700
x156
177G2
Fibonacci Strings
matrices
,
strings
2600
x169
86E
Long sequence
brute force
,
math
,
matrices
2700
x177
1402C
Star Trek
*special problem
,
combinatorics
,
dfs and similar
,
dp
,
games
,
graphs
,
matrices
,
trees
2600
x195
618G
Combining Slimes
dp
,
math
,
matrices
,
probabilities
3300
x215
989E
A Trance of Nightfall
dp
,
geometry
,
matrices
,
probabilities
2700
x227
1474F
1 2 3 4 ...
dp
,
math
,
matrices
3000
x232
1197F
Coloring Game
dp
,
games
,
matrices
2700
x236
472F
Design Tutorial: Change the Goal
constructive algorithms
,
math
,
matrices
2700
x247
1344F
Piet's Palette
matrices
3200
x249
1864H
Asterism Stream
dp
,
math
,
matrices
3200
x264
832E
Vasya and Shifts
matrices
2600
x276
497E
Subsequences Return
dp
,
matrices
2900
x280
1662C
European Trip
dp
,
graphs
,
math
,
matrices
x288
1698G
Long Binary String
bitmasks
,
math
,
matrices
,
meet-in-the-middle
,
number theory
2900
x299
1672G
Cross Xor
constructive algorithms
,
graphs
,
math
,
matrices
3200
x310
60E
Mushroom Gnomes
math
,
matrices
2600
x314
193E
Fibonacci Number
brute force
,
math
,
matrices
2900
x319
93D
Flags
dp
,
math
,
matrices
2500
x331
51E
Pentagon
combinatorics
,
graphs
,
matrices
2400
x362
917C
Pollywog
combinatorics
,
dp
,
matrices
2900
x369
446D
DZY Loves Games
math
,
matrices
,
probabilities
2800
x376
593E
Strange Calculation and Cats
dp
,
matrices
2400
x397
107D
Crime Management
dp
,
graphs
,
matrices
2400
x398
1511F
Chainword
brute force
,
data structures
,
dp
,
matrices
,
string suffix structures
,
strings
2700
x414
662A
Gambling Nim
bitmasks
,
math
,
matrices
,
probabilities
2400
x427
923E
Perpetual Subtraction
fft
,
math
,
matrices
3100
x431
498E
Stairs and Lines
dp
,
matrices
2700
x447
736D
Permutations
math
,
matrices
2800
x448
453D
Little Pony and Elements of Harmony
dp
,
matrices
3000
x458
193C
Hamming Distance
constructive algorithms
,
greedy
,
math
,
matrices
2400
x493
1916H2
Matrix Rank (Hard Version)
combinatorics
,
dp
,
math
,
matrices
,
string suffix structures
2700
x495
1152F1
Neko Rules the Catniverse (Small Version)
bitmasks
,
dp
,
matrices
2800
x507
946F
Fibonacci String Subsequences
combinatorics
,
dp
,
matrices
2400
x527
578F
Mirror Box
matrices
,
trees
3200
x527
351C
Jeff and Brackets
dp
,
matrices
2500
x536
167E
Wizards and Bets
dfs and similar
,
graphs
,
math
,
matrices
2900
x538
1025E
Colored Cubes
constructive algorithms
,
implementation
,
matrices
2700
x545
1286D
LCC
data structures
,
math
,
matrices
,
probabilities
3100
x551
385E
Bear in the Field
math
,
matrices
2300
x552
1411G
No Game No Life
bitmasks
,
games
,
math
,
matrices
2700
x574
392C
Yet Another Number Sequence
combinatorics
,
math
,
matrices
x574
1916H1
Matrix Rank (Easy Version)
brute force
,
combinatorics
,
dp
,
math
,
matrices
2700
x578
1616F
Tricolor Triangles
brute force
,
graphs
,
math
,
matrices
2900
x580
1152F2
Neko Rules the Catniverse (Large Version)
bitmasks
,
dp
,
matrices
3000
x586
1895F
Fancy Arrays
combinatorics
,
dp
,
math
,
matrices
2600
x614
1844G
Tree Weights
bitmasks
,
constructive algorithms
,
data structures
,
dfs and similar
,
implementation
,
math
,
matrices
,
number theory
,
trees
3000
x632
1808E2
Minibuses on Venus (medium version)
combinatorics
,
divide and conquer
,
dp
,
matrices
2500
x639
113D
Museum
math
,
matrices
,
probabilities
2700
x647
506E
Mr. Kitayuta's Gift
combinatorics
,
dp
,
matrices
,
strings
3000
x678
1681E
Labyrinth Adventures
data structures
,
dp
,
matrices
,
shortest paths
2600
x696
1919F2
Wine Factory (Hard Version)
data structures
,
dp
,
flows
,
greedy
,
matrices
2800
x726
837F
Prefix Sums
binary search
,
brute force
,
combinatorics
,
math
,
matrices
2400
x731
147B
Smile House
binary search
,
graphs
,
matrices
2500
x740
1380F
Strange Addition
data structures
,
dp
,
matrices
2600
x751
575A
Fibonotci
data structures
,
math
,
matrices
2700
x754
891E
Lust
combinatorics
,
math
,
matrices
3000
x837
226C
Anniversary
data structures
,
implementation
,
math
,
matrices
,
number theory
2400
x840
1701F
Points
combinatorics
,
data structures
,
implementation
,
math
,
matrices
2500
x878
1106F
Lunar New Year and a Recursive Sequence
math
,
matrices
,
number theory
2400
x940
954F
Runner's Problem
dp
,
matrices
,
sortings
2100
x972
917D
Stranger Trees
dp
,
math
,
matrices
,
trees
2600
x996
632F
Magic Matrix
brute force
,
divide and conquer
,
graphs
,
matrices
,
trees
2400
x1011
780F
Axel and Marston in Bitland
bitmasks
,
dp
,
graphs
,
matrices
2400
x1017
1924C
Fractal Origami
geometry
,
math
,
matrices
2400
x1020
1151F
Sonya and Informatics
combinatorics
,
dp
,
matrices
,
probabilities
2300
x1134
1458C
Latin Square
math
,
matrices
2700
x1193
1814E
Chain Chips
data structures
,
dp
,
matrices
2300
x1212
696D
Legen...
data structures
,
dp
,
matrices
,
strings
2500
x1212
1427E
Xum
bitmasks
,
constructive algorithms
,
math
,
matrices
,
number theory
2500
x1256
576D
Flights for Regular Customers
dp
,
matrices
2700
x1301
717D
Dexterina’s Lab
games
,
matrices
,
probabilities
1900
x1353
514E
Darth Vader and Tree
dp
,
matrices
2200
x1354
852B
Neural Network country
dp
,
matrices
2000
x1366
1743F
Intersection and Union
data structures
,
dp
,
matrices
,
probabilities
2300
x1402
821E
Okabe and El Psy Kongroo
dp
,
matrices
2100
x1405
750E
New Year and Old Subsequence
data structures
,
divide and conquer
,
dp
,
matrices
2600
x1462
1713E
Cross Swapping
2-sat
,
data structures
,
dsu
,
greedy
,
matrices
2400
x1504
348D
Turtles
dp
,
matrices
2500
x1552
1101G
(Zero XOR Subset)-less
math
,
matrices
2300
x1596
1761E
Make It Connected
binary search
,
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
matrices
,
trees
,
two pointers
2400
x1715
551D
GukiZ and Binary Operations
combinatorics
,
implementation
,
math
,
matrices
,
number theory
2100
x1720
1252K
Addition Robot
data structures
,
math
,
matrices
2100
x1778
1609E
William The Oblivious
bitmasks
,
data structures
,
dp
,
matrices
2400
x1831
959F
Mahmoud and Ehab and yet another xor task
bitmasks
,
dp
,
math
,
matrices
2400
x1931
1023E
Down or Right
constructive algorithms
,
interactive
,
matrices
2100
x1947
1335F
Robots on a Grid
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
matrices
2200
x1954
696C
PLEASE
combinatorics
,
dp
,
implementation
,
math
,
matrices
2000
x2043
691E
Xor-sequences
matrices
1900
x2349
222E
Decoding Genome
dp
,
matrices
1900
x2515
1182E
Product Oriented Recurrence
dp
,
math
,
matrices
,
number theory
2300
x2516
621E
Wet Shark and Blocks
dp
,
matrices
2000
x2711
1538E
Funny Substrings
data structures
,
hashing
,
implementation
,
matrices
,
strings
2100
x2794
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