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Before contest
Codeforces Round 941 (Div. 1)
2 days
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Before contest
Codeforces Round 941 (Div. 2)
2 days
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matrices
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dfs and similar
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Name
1924C
Fractal Origami
geometry
,
math
,
matrices
2400
x1024
1919F2
Wine Factory (Hard Version)
data structures
,
dp
,
flows
,
greedy
,
matrices
2800
x729
1916H2
Matrix Rank (Hard Version)
combinatorics
,
dp
,
math
,
matrices
,
string suffix structures
2700
x499
1916H1
Matrix Rank (Easy Version)
brute force
,
combinatorics
,
dp
,
math
,
matrices
2700
x581
1895F
Fancy Arrays
combinatorics
,
dp
,
math
,
matrices
2600
x618
1864H
Asterism Stream
dp
,
math
,
matrices
3200
x267
1844G
Tree Weights
bitmasks
,
constructive algorithms
,
data structures
,
dfs and similar
,
implementation
,
math
,
matrices
,
number theory
,
trees
3000
x637
1814E
Chain Chips
data structures
,
dp
,
matrices
2300
x1231
1808E2
Minibuses on Venus (medium version)
combinatorics
,
divide and conquer
,
dp
,
matrices
2500
x641
1761E
Make It Connected
binary search
,
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
matrices
,
trees
,
two pointers
2400
x1717
1743F
Intersection and Union
data structures
,
dp
,
matrices
,
probabilities
2300
x1406
1713E
Cross Swapping
2-sat
,
data structures
,
dsu
,
greedy
,
matrices
2400
x1506
1701F
Points
combinatorics
,
data structures
,
implementation
,
math
,
matrices
2500
x880
1699B
Almost Ternary Matrix
bitmasks
,
constructive algorithms
,
matrices
900
x19135
1698G
Long Binary String
bitmasks
,
math
,
matrices
,
meet-in-the-middle
,
number theory
2900
x300
1681E
Labyrinth Adventures
data structures
,
dp
,
matrices
,
shortest paths
2600
x697
1672G
Cross Xor
constructive algorithms
,
graphs
,
math
,
matrices
3200
x313
1662C
European Trip
dp
,
graphs
,
math
,
matrices
x288
1648A
Weird Sum
combinatorics
,
data structures
,
geometry
,
math
,
matrices
,
sortings
1400
x11685
1635D
Infinite Set
bitmasks
,
dp
,
math
,
matrices
,
number theory
,
strings
1800
x5984
1616F
Tricolor Triangles
brute force
,
graphs
,
math
,
matrices
2900
x582
1609E
William The Oblivious
bitmasks
,
data structures
,
dp
,
matrices
2400
x1835
1599E
Two Arrays
data structures
,
matrices
3200
x66
1557C
Moamen and XOR
bitmasks
,
combinatorics
,
dp
,
math
,
matrices
1700
x8301
1540E
Tasty Dishes
math
,
matrices
3500
x98
1538E
Funny Substrings
data structures
,
hashing
,
implementation
,
matrices
,
strings
2100
x2798
1513C
Add One
dp
,
matrices
1600
x13144
1511F
Chainword
brute force
,
data structures
,
dp
,
matrices
,
string suffix structures
,
strings
2700
x417
1474F
1 2 3 4 ...
dp
,
math
,
matrices
3000
x239
1458C
Latin Square
math
,
matrices
2700
x1197
1427E
Xum
bitmasks
,
constructive algorithms
,
math
,
matrices
,
number theory
2500
x1258
1411G
No Game No Life
bitmasks
,
games
,
math
,
matrices
2700
x578
1402C
Star Trek
*special problem
,
combinatorics
,
dfs and similar
,
dp
,
games
,
graphs
,
matrices
,
trees
2600
x195
1380F
Strange Addition
data structures
,
dp
,
matrices
2600
x753
1375I
Cubic Lattice
geometry
,
math
,
matrices
,
number theory
3500
x76
1344F
Piet's Palette
matrices
3200
x252
1335F
Robots on a Grid
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
matrices
2200
x1958
1332E
Height All the Same
combinatorics
,
constructive algorithms
,
math
,
matrices
2100
x3551
1286D
LCC
data structures
,
math
,
matrices
,
probabilities
3100
x555
1266H
Red-Blue Graph
dp
,
graphs
,
math
,
matrices
,
meet-in-the-middle
3400
x99
1252K
Addition Robot
data structures
,
math
,
matrices
2100
x1780
1197F
Coloring Game
dp
,
games
,
matrices
2700
x237
1188B
Count Pairs
math
,
matrices
,
number theory
,
two pointers
2300
x4205
1184D2
Parallel Universes (Hard)
math
,
matrices
3100
x102
1182E
Product Oriented Recurrence
dp
,
math
,
matrices
,
number theory
2300
x2521
1152F2
Neko Rules the Catniverse (Large Version)
bitmasks
,
dp
,
matrices
3000
x591
1152F1
Neko Rules the Catniverse (Small Version)
bitmasks
,
dp
,
matrices
2800
x512
1151F
Sonya and Informatics
combinatorics
,
dp
,
matrices
,
probabilities
2300
x1138
1117D
Magic Gems
dp
,
math
,
matrices
2100
x3999
1106F
Lunar New Year and a Recursive Sequence
math
,
matrices
,
number theory
2400
x944
1101G
(Zero XOR Subset)-less
math
,
matrices
2300
x1602
1025E
Colored Cubes
constructive algorithms
,
implementation
,
matrices
2700
x547
1023E
Down or Right
constructive algorithms
,
interactive
,
matrices
2100
x1949
1012B
Chemical table
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
matrices
1900
x3645
989E
A Trance of Nightfall
dp
,
geometry
,
matrices
,
probabilities
2700
x228
959F
Mahmoud and Ehab and yet another xor task
bitmasks
,
dp
,
math
,
matrices
2400
x1936
954F
Runner's Problem
dp
,
matrices
,
sortings
2100
x975
946F
Fibonacci String Subsequences
combinatorics
,
dp
,
matrices
2400
x528
923E
Perpetual Subtraction
fft
,
math
,
matrices
3100
x435
917D
Stranger Trees
dp
,
math
,
matrices
,
trees
2600
x999
917C
Pollywog
combinatorics
,
dp
,
matrices
2900
x370
891E
Lust
combinatorics
,
math
,
matrices
3000
x840
865G
Flowers and Chocolate
combinatorics
,
math
,
matrices
3300
x130
852B
Neural Network country
dp
,
matrices
2000
x1369
837F
Prefix Sums
binary search
,
brute force
,
combinatorics
,
math
,
matrices
2400
x734
832E
Vasya and Shifts
matrices
2600
x277
821E
Okabe and El Psy Kongroo
dp
,
matrices
2100
x1409
780F
Axel and Marston in Bitland
bitmasks
,
dp
,
graphs
,
matrices
2400
x1018
750E
New Year and Old Subsequence
data structures
,
divide and conquer
,
dp
,
matrices
2600
x1464
736D
Permutations
math
,
matrices
2800
x450
718C
Sasha and Array
data structures
,
math
,
matrices
2300
x3358
717D
Dexterina’s Lab
games
,
matrices
,
probabilities
1900
x1356
696D
Legen...
data structures
,
dp
,
matrices
,
strings
2500
x1217
696C
PLEASE
combinatorics
,
dp
,
implementation
,
math
,
matrices
2000
x2045
691E
Xor-sequences
matrices
1900
x2353
662A
Gambling Nim
bitmasks
,
math
,
matrices
,
probabilities
2400
x429
632F
Magic Matrix
brute force
,
divide and conquer
,
graphs
,
matrices
,
trees
2400
x1015
621E
Wet Shark and Blocks
dp
,
matrices
2000
x2714
618G
Combining Slimes
dp
,
math
,
matrices
,
probabilities
3300
x216
593E
Strange Calculation and Cats
dp
,
matrices
2400
x399
582B
Once Again...
constructive algorithms
,
dp
,
matrices
1900
x3302
578F
Mirror Box
matrices
,
trees
3200
x529
576D
Flights for Regular Customers
dp
,
matrices
2700
x1304
575A
Fibonotci
data structures
,
math
,
matrices
2700
x756
551D
GukiZ and Binary Operations
combinatorics
,
implementation
,
math
,
matrices
,
number theory
2100
x1721
514E
Darth Vader and Tree
dp
,
matrices
2200
x1361
506E
Mr. Kitayuta's Gift
combinatorics
,
dp
,
matrices
,
strings
3000
x680
498E
Stairs and Lines
dp
,
matrices
2700
x448
497E
Subsequences Return
dp
,
matrices
2900
x281
485A
Factory
implementation
,
math
,
matrices
1400
x8083
472F
Design Tutorial: Change the Goal
constructive algorithms
,
math
,
matrices
2700
x248
453D
Little Pony and Elements of Harmony
dp
,
matrices
3000
x459
446E
DZY Loves Bridges
math
,
matrices
3100
x118
446D
DZY Loves Games
math
,
matrices
,
probabilities
2800
x378
392C
Yet Another Number Sequence
combinatorics
,
math
,
matrices
x574
385E
Bear in the Field
math
,
matrices
2300
x554
351C
Jeff and Brackets
dp
,
matrices
2500
x537
348D
Turtles
dp
,
matrices
2500
x1557
337C
Quiz
binary search
,
greedy
,
math
,
matrices
,
number theory
1600
x4763
267C
Berland Traffic
math
,
matrices
2700
x159
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