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Before contest
Codeforces Round 875 (Div. 1)
10:21:23
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Before contest
Codeforces Round 875 (Div. 2)
10:21:23
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matrices
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Name
1375I
Cubic Lattice
geometry
,
math
,
matrices
,
number theory
3500
x69
1540E
Tasty Dishes
math
,
matrices
3500
x74
1266H
Red-Blue Graph
dp
,
graphs
,
math
,
matrices
,
meet-in-the-middle
3400
x88
865G
Flowers and Chocolate
combinatorics
,
math
,
matrices
3300
x120
618G
Combining Slimes
dp
,
math
,
matrices
,
probabilities
3300
x198
1599E
Two Arrays
data structures
,
matrices
3200
x47
1344F
Piet's Palette
matrices
3200
x191
1672G
Cross Xor
constructive algorithms
,
graphs
,
math
,
matrices
3200
x233
578F
Mirror Box
matrices
,
trees
3200
x401
1184D2
Parallel Universes (Hard)
math
,
matrices
3100
x52
446E
DZY Loves Bridges
math
,
matrices
3100
x102
923E
Perpetual Subtraction
fft
,
math
,
matrices
3100
x387
1286D
LCC
data structures
,
math
,
matrices
,
probabilities
3100
x475
1474F
1 2 3 4 ...
dp
,
math
,
matrices
3000
x166
1152F2
Neko Rules the Catniverse (Large Version)
bitmasks
,
dp
,
matrices
3000
x408
453D
Little Pony and Elements of Harmony
dp
,
matrices
3000
x418
506E
Mr. Kitayuta's Gift
combinatorics
,
dp
,
matrices
,
strings
3000
x579
891E
Lust
combinatorics
,
math
,
matrices
3000
x725
497E
Subsequences Return
dp
,
matrices
2900
x249
1698G
Long Binary String
bitmasks
,
math
,
matrices
,
meet-in-the-middle
,
number theory
2900
x252
193E
Fibonacci Number
brute force
,
math
,
matrices
2900
x293
917C
Pollywog
combinatorics
,
dp
,
matrices
2900
x310
167E
Wizards and Bets
dfs and similar
,
graphs
,
math
,
matrices
2900
x458
1616F
Tricolor Triangles
brute force
,
graphs
,
math
,
matrices
2900
x500
446D
DZY Loves Games
math
,
matrices
,
probabilities
2800
x298
1152F1
Neko Rules the Catniverse (Small Version)
bitmasks
,
dp
,
matrices
2800
x371
736D
Permutations
math
,
matrices
2800
x392
267C
Berland Traffic
math
,
matrices
2700
x139
86E
Long sequence
brute force
,
math
,
matrices
2700
x163
1197F
Coloring Game
dp
,
games
,
matrices
2700
x204
989E
A Trance of Nightfall
dp
,
geometry
,
matrices
,
probabilities
2700
x217
472F
Design Tutorial: Change the Goal
constructive algorithms
,
math
,
matrices
2700
x239
1511F
Chainword
brute force
,
data structures
,
dp
,
matrices
,
string suffix structures
,
strings
2700
x323
498E
Stairs and Lines
dp
,
matrices
2700
x380
1025E
Colored Cubes
constructive algorithms
,
implementation
,
matrices
2700
x497
1411G
No Game No Life
bitmasks
,
games
,
math
,
matrices
2700
x504
113D
Museum
math
,
matrices
,
probabilities
2700
x564
575A
Fibonotci
data structures
,
math
,
matrices
2700
x596
1458C
Latin Square
math
,
matrices
2700
x1048
576D
Flights for Regular Customers
dp
,
matrices
2700
x1094
177G2
Fibonacci Strings
matrices
,
strings
2600
x130
1402C
Star Trek
*special problem
,
combinatorics
,
dfs and similar
,
dp
,
games
,
graphs
,
matrices
,
trees
2600
x180
832E
Vasya and Shifts
matrices
2600
x248
60E
Mushroom Gnomes
math
,
matrices
2600
x282
1681E
Labyrinth Adventures
data structures
,
dp
,
matrices
,
shortest paths
2600
x569
1380F
Strange Addition
data structures
,
dp
,
matrices
2600
x660
917D
Stranger Trees
dp
,
math
,
matrices
,
trees
2600
x802
750E
New Year and Old Subsequence
data structures
,
divide and conquer
,
dp
,
matrices
2600
x1327
93D
Flags
dp
,
math
,
matrices
2500
x298
1808E2
Minibuses on Venus (medium version)
combinatorics
,
divide and conquer
,
dp
,
matrices
2500
x432
351C
Jeff and Brackets
dp
,
matrices
2500
x509
147B
Smile House
binary search
,
graphs
,
matrices
2500
x680
1701F
Points
combinatorics
,
data structures
,
implementation
,
math
,
matrices
2500
x762
696D
Legen...
data structures
,
dp
,
matrices
,
strings
2500
x1054
1427E
Xum
bitmasks
,
constructive algorithms
,
math
,
matrices
,
number theory
2500
x1150
348D
Turtles
dp
,
matrices
2500
x1289
51E
Pentagon
combinatorics
,
graphs
,
matrices
2400
x325
662A
Gambling Nim
bitmasks
,
math
,
matrices
,
probabilities
2400
x353
593E
Strange Calculation and Cats
dp
,
matrices
2400
x371
107D
Crime Management
dp
,
graphs
,
matrices
2400
x371
193C
Hamming Distance
constructive algorithms
,
greedy
,
math
,
matrices
2400
x466
946F
Fibonacci String Subsequences
combinatorics
,
dp
,
matrices
2400
x481
837F
Prefix Sums
binary search
,
brute force
,
combinatorics
,
math
,
matrices
2400
x657
226C
Anniversary
data structures
,
implementation
,
math
,
matrices
,
number theory
2400
x737
632F
Magic Matrix
brute force
,
divide and conquer
,
graphs
,
matrices
,
trees
2400
x802
1106F
Lunar New Year and a Recursive Sequence
math
,
matrices
,
number theory
2400
x831
780F
Axel and Marston in Bitland
bitmasks
,
dp
,
graphs
,
matrices
2400
x942
1713E
Cross Swapping
2-sat
,
data structures
,
dsu
,
greedy
,
matrices
2400
x1342
1761E
Make It Connected
binary search
,
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
matrices
,
trees
,
two pointers
2400
x1416
959F
Mahmoud and Ehab and yet another xor task
bitmasks
,
dp
,
math
,
matrices
2400
x1548
1609E
William The Oblivious
bitmasks
,
data structures
,
dp
,
matrices
2400
x1621
385E
Bear in the Field
math
,
matrices
2300
x528
1814E
Chain Chips
data structures
,
dp
,
matrices
2300
x874
1151F
Sonya and Informatics
combinatorics
,
dp
,
matrices
,
probabilities
2300
x996
1743F
Intersection and Union
data structures
,
dp
,
matrices
,
probabilities
2300
x1223
1101G
(Zero XOR Subset)-less
math
,
matrices
2300
x1390
1182E
Product Oriented Recurrence
dp
,
math
,
matrices
,
number theory
2300
x2279
718C
Sasha and Array
data structures
,
math
,
matrices
2300
x2742
1188B
Count Pairs
math
,
matrices
,
number theory
,
two pointers
2300
x3790
514E
Darth Vader and Tree
dp
,
matrices
2200
x1215
1335F
Robots on a Grid
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
matrices
2200
x1845
954F
Runner's Problem
dp
,
matrices
,
sortings
2100
x886
821E
Okabe and El Psy Kongroo
dp
,
matrices
2100
x1311
1252K
Addition Robot
data structures
,
math
,
matrices
2100
x1610
551D
GukiZ and Binary Operations
combinatorics
,
implementation
,
math
,
matrices
,
number theory
2100
x1615
1023E
Down or Right
constructive algorithms
,
interactive
,
matrices
2100
x1843
1538E
Funny Substrings
data structures
,
hashing
,
implementation
,
matrices
,
strings
2100
x2570
1332E
Height All the Same
combinatorics
,
constructive algorithms
,
math
,
matrices
2100
x3259
1117D
Magic Gems
dp
,
math
,
matrices
2100
x3479
852B
Neural Network country
dp
,
matrices
2000
x1178
696C
PLEASE
combinatorics
,
dp
,
implementation
,
math
,
matrices
2000
x1950
621E
Wet Shark and Blocks
dp
,
matrices
2000
x2432
717D
Dexterina’s Lab
games
,
matrices
,
probabilities
1900
x1268
691E
Xor-sequences
matrices
1900
x2072
222E
Decoding Genome
dp
,
matrices
1900
x2081
582B
Once Again...
constructive algorithms
,
dp
,
matrices
1900
x3155
1012B
Chemical table
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
matrices
1900
x3416
1635D
Infinite Set
bitmasks
,
dp
,
math
,
matrices
,
number theory
,
strings
1800
x5293
1557C
Moamen and XOR
bitmasks
,
combinatorics
,
dp
,
math
,
matrices
1700
x7662
225C
Barcode
dp
,
matrices
1700
x7984
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