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Before contest
Codeforces Round 940 (Div. 2) and CodeCraft-23
37:40:09
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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
1699B
Almost Ternary Matrix
bitmasks
,
constructive algorithms
,
matrices
900
x19120
1648A
Weird Sum
combinatorics
,
data structures
,
geometry
,
math
,
matrices
,
sortings
1400
x11659
485A
Factory
implementation
,
math
,
matrices
1400
x8080
166E
Tetrahedron
dp
,
math
,
matrices
1500
x19843
1513C
Add One
dp
,
matrices
1600
x13119
337C
Quiz
binary search
,
greedy
,
math
,
matrices
,
number theory
1600
x4761
225C
Barcode
dp
,
matrices
1700
x8716
1557C
Moamen and XOR
bitmasks
,
combinatorics
,
dp
,
math
,
matrices
1700
x8294
1635D
Infinite Set
bitmasks
,
dp
,
math
,
matrices
,
number theory
,
strings
1800
x5973
1012B
Chemical table
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
matrices
1900
x3643
582B
Once Again...
constructive algorithms
,
dp
,
matrices
1900
x3301
222E
Decoding Genome
dp
,
matrices
1900
x2517
691E
Xor-sequences
matrices
1900
x2352
717D
Dexterina’s Lab
games
,
matrices
,
probabilities
1900
x1356
621E
Wet Shark and Blocks
dp
,
matrices
2000
x2713
696C
PLEASE
combinatorics
,
dp
,
implementation
,
math
,
matrices
2000
x2044
852B
Neural Network country
dp
,
matrices
2000
x1366
1117D
Magic Gems
dp
,
math
,
matrices
2100
x3997
1332E
Height All the Same
combinatorics
,
constructive algorithms
,
math
,
matrices
2100
x3549
1538E
Funny Substrings
data structures
,
hashing
,
implementation
,
matrices
,
strings
2100
x2795
1023E
Down or Right
constructive algorithms
,
interactive
,
matrices
2100
x1948
1252K
Addition Robot
data structures
,
math
,
matrices
2100
x1778
551D
GukiZ and Binary Operations
combinatorics
,
implementation
,
math
,
matrices
,
number theory
2100
x1721
821E
Okabe and El Psy Kongroo
dp
,
matrices
2100
x1407
954F
Runner's Problem
dp
,
matrices
,
sortings
2100
x974
1335F
Robots on a Grid
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
matrices
2200
x1955
514E
Darth Vader and Tree
dp
,
matrices
2200
x1355
1188B
Count Pairs
math
,
matrices
,
number theory
,
two pointers
2300
x4198
718C
Sasha and Array
data structures
,
math
,
matrices
2300
x3355
1182E
Product Oriented Recurrence
dp
,
math
,
matrices
,
number theory
2300
x2516
1101G
(Zero XOR Subset)-less
math
,
matrices
2300
x1597
1743F
Intersection and Union
data structures
,
dp
,
matrices
,
probabilities
2300
x1405
1814E
Chain Chips
data structures
,
dp
,
matrices
2300
x1223
1151F
Sonya and Informatics
combinatorics
,
dp
,
matrices
,
probabilities
2300
x1135
385E
Bear in the Field
math
,
matrices
2300
x553
959F
Mahmoud and Ehab and yet another xor task
bitmasks
,
dp
,
math
,
matrices
2400
x1931
1609E
William The Oblivious
bitmasks
,
data structures
,
dp
,
matrices
2400
x1831
1761E
Make It Connected
binary search
,
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
matrices
,
trees
,
two pointers
2400
x1715
1713E
Cross Swapping
2-sat
,
data structures
,
dsu
,
greedy
,
matrices
2400
x1505
1924C
Fractal Origami
geometry
,
math
,
matrices
2400
x1021
780F
Axel and Marston in Bitland
bitmasks
,
dp
,
graphs
,
matrices
2400
x1017
632F
Magic Matrix
brute force
,
divide and conquer
,
graphs
,
matrices
,
trees
2400
x1011
1106F
Lunar New Year and a Recursive Sequence
math
,
matrices
,
number theory
2400
x941
226C
Anniversary
data structures
,
implementation
,
math
,
matrices
,
number theory
2400
x840
837F
Prefix Sums
binary search
,
brute force
,
combinatorics
,
math
,
matrices
2400
x732
946F
Fibonacci String Subsequences
combinatorics
,
dp
,
matrices
2400
x527
193C
Hamming Distance
constructive algorithms
,
greedy
,
math
,
matrices
2400
x493
662A
Gambling Nim
bitmasks
,
math
,
matrices
,
probabilities
2400
x428
107D
Crime Management
dp
,
graphs
,
matrices
2400
x398
593E
Strange Calculation and Cats
dp
,
matrices
2400
x397
51E
Pentagon
combinatorics
,
graphs
,
matrices
2400
x362
348D
Turtles
dp
,
matrices
2500
x1554
1427E
Xum
bitmasks
,
constructive algorithms
,
math
,
matrices
,
number theory
2500
x1256
696D
Legen...
data structures
,
dp
,
matrices
,
strings
2500
x1212
1701F
Points
combinatorics
,
data structures
,
implementation
,
math
,
matrices
2500
x879
147B
Smile House
binary search
,
graphs
,
matrices
2500
x740
1808E2
Minibuses on Venus (medium version)
combinatorics
,
divide and conquer
,
dp
,
matrices
2500
x640
351C
Jeff and Brackets
dp
,
matrices
2500
x536
93D
Flags
dp
,
math
,
matrices
2500
x331
750E
New Year and Old Subsequence
data structures
,
divide and conquer
,
dp
,
matrices
2600
x1462
917D
Stranger Trees
dp
,
math
,
matrices
,
trees
2600
x996
1380F
Strange Addition
data structures
,
dp
,
matrices
2600
x752
1681E
Labyrinth Adventures
data structures
,
dp
,
matrices
,
shortest paths
2600
x696
1895F
Fancy Arrays
combinatorics
,
dp
,
math
,
matrices
2600
x615
60E
Mushroom Gnomes
math
,
matrices
2600
x314
832E
Vasya and Shifts
matrices
2600
x276
1402C
Star Trek
*special problem
,
combinatorics
,
dfs and similar
,
dp
,
games
,
graphs
,
matrices
,
trees
2600
x195
177G2
Fibonacci Strings
matrices
,
strings
2600
x169
576D
Flights for Regular Customers
dp
,
matrices
2700
x1302
1458C
Latin Square
math
,
matrices
2700
x1193
575A
Fibonotci
data structures
,
math
,
matrices
2700
x755
113D
Museum
math
,
matrices
,
probabilities
2700
x647
1916H1
Matrix Rank (Easy Version)
brute force
,
combinatorics
,
dp
,
math
,
matrices
2700
x579
1411G
No Game No Life
bitmasks
,
games
,
math
,
matrices
2700
x574
1025E
Colored Cubes
constructive algorithms
,
implementation
,
matrices
2700
x545
1916H2
Matrix Rank (Hard Version)
combinatorics
,
dp
,
math
,
matrices
,
string suffix structures
2700
x496
498E
Stairs and Lines
dp
,
matrices
2700
x447
1511F
Chainword
brute force
,
data structures
,
dp
,
matrices
,
string suffix structures
,
strings
2700
x414
472F
Design Tutorial: Change the Goal
constructive algorithms
,
math
,
matrices
2700
x247
1197F
Coloring Game
dp
,
games
,
matrices
2700
x236
989E
A Trance of Nightfall
dp
,
geometry
,
matrices
,
probabilities
2700
x227
86E
Long sequence
brute force
,
math
,
matrices
2700
x177
267C
Berland Traffic
math
,
matrices
2700
x158
1919F2
Wine Factory (Hard Version)
data structures
,
dp
,
flows
,
greedy
,
matrices
2800
x726
1152F1
Neko Rules the Catniverse (Small Version)
bitmasks
,
dp
,
matrices
2800
x507
736D
Permutations
math
,
matrices
2800
x448
446D
DZY Loves Games
math
,
matrices
,
probabilities
2800
x377
1616F
Tricolor Triangles
brute force
,
graphs
,
math
,
matrices
2900
x580
167E
Wizards and Bets
dfs and similar
,
graphs
,
math
,
matrices
2900
x541
917C
Pollywog
combinatorics
,
dp
,
matrices
2900
x369
193E
Fibonacci Number
brute force
,
math
,
matrices
2900
x319
1698G
Long Binary String
bitmasks
,
math
,
matrices
,
meet-in-the-middle
,
number theory
2900
x299
497E
Subsequences Return
dp
,
matrices
2900
x280
891E
Lust
combinatorics
,
math
,
matrices
3000
x837
506E
Mr. Kitayuta's Gift
combinatorics
,
dp
,
matrices
,
strings
3000
x678
1844G
Tree Weights
bitmasks
,
constructive algorithms
,
data structures
,
dfs and similar
,
implementation
,
math
,
matrices
,
number theory
,
trees
3000
x632
1152F2
Neko Rules the Catniverse (Large Version)
bitmasks
,
dp
,
matrices
3000
x586
453D
Little Pony and Elements of Harmony
dp
,
matrices
3000
x458
1474F
1 2 3 4 ...
dp
,
math
,
matrices
3000
x233
1286D
LCC
data structures
,
math
,
matrices
,
probabilities
3100
x551
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