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Codeforces Round 973 (Div. 2)
13:35:16
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Difficulty:
—
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
2004G
Substring Compression
data structures
,
dp
,
matrices
3200
x265
1995E2
Let Me Teach You a Lesson (Hard Version)
data structures
,
dp
,
matrices
,
two pointers
2900
x281
1995E1
Let Me Teach You a Lesson (Easy Version)
2-sat
,
data structures
,
dp
,
matrices
,
two pointers
2700
x354
1980E
Permutation of Rows and Columns
constructive algorithms
,
data structures
,
greedy
,
hashing
,
implementation
,
math
,
matrices
,
sortings
1600
x10055
1970E3
Trails (Hard)
dp
,
matrices
2200
x684
1970E2
Trails (Medium)
dp
,
matrices
2000
x1186
1924C
Fractal Origami
geometry
,
math
,
matrices
2400
x1133
1919F2
Wine Factory (Hard Version)
data structures
,
dp
,
flows
,
greedy
,
matrices
2800
x820
1916H2
Matrix Rank (Hard Version)
combinatorics
,
dp
,
math
,
matrices
,
string suffix structures
2700
x527
1916H1
Matrix Rank (Easy Version)
brute force
,
combinatorics
,
dp
,
math
,
matrices
2700
x607
1895F
Fancy Arrays
combinatorics
,
dp
,
math
,
matrices
2600
x751
1864H
Asterism Stream
dp
,
math
,
matrices
3200
x278
1844G
Tree Weights
bitmasks
,
constructive algorithms
,
data structures
,
dfs and similar
,
implementation
,
math
,
matrices
,
number theory
,
trees
3000
x716
1814E
Chain Chips
data structures
,
dp
,
matrices
2300
x1330
1808E2
Minibuses on Venus (medium version)
combinatorics
,
divide and conquer
,
dp
,
matrices
2500
x680
1761E
Make It Connected
binary search
,
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
matrices
,
trees
,
two pointers
2400
x1828
1743F
Intersection and Union
data structures
,
dp
,
matrices
,
probabilities
2300
x1482
1713E
Cross Swapping
2-sat
,
data structures
,
dsu
,
greedy
,
matrices
2400
x1646
1701F
Points
combinatorics
,
data structures
,
implementation
,
math
,
matrices
2500
x921
1699B
Almost Ternary Matrix
bitmasks
,
constructive algorithms
,
matrices
900
x19658
1698G
Long Binary String
bitmasks
,
math
,
matrices
,
meet-in-the-middle
,
number theory
2900
x315
1681E
Labyrinth Adventures
data structures
,
dp
,
matrices
,
shortest paths
2600
x794
1672G
Cross Xor
constructive algorithms
,
graphs
,
math
,
matrices
3200
x321
1662C
European Trip
dp
,
graphs
,
math
,
matrices
x318
1648A
Weird Sum
combinatorics
,
data structures
,
geometry
,
math
,
matrices
,
sortings
1400
x12694
1635D
Infinite Set
bitmasks
,
dp
,
math
,
matrices
,
number theory
,
strings
1800
x6234
1616F
Tricolor Triangles
brute force
,
graphs
,
math
,
matrices
2900
x592
1609E
William The Oblivious
bitmasks
,
data structures
,
dp
,
matrices
2400
x2068
1599E
Two Arrays
data structures
,
matrices
3200
x67
1557C
Moamen and XOR
bitmasks
,
combinatorics
,
dp
,
math
,
matrices
1700
x8576
1540E
Tasty Dishes
math
,
matrices
3500
x105
1538E
Funny Substrings
data structures
,
hashing
,
implementation
,
matrices
,
strings
2100
x2884
1513C
Add One
dp
,
matrices
1600
x13939
1511F
Chainword
brute force
,
data structures
,
dp
,
matrices
,
string suffix structures
,
strings
2700
x431
1474F
1 2 3 4 ...
dp
,
math
,
matrices
3000
x244
1458C
Latin Square
math
,
matrices
2700
x1306
1427E
Xum
bitmasks
,
constructive algorithms
,
math
,
matrices
,
number theory
2500
x1399
1411G
No Game No Life
bitmasks
,
games
,
math
,
matrices
2700
x660
1402C
Star Trek
*special problem
,
combinatorics
,
dfs and similar
,
dp
,
games
,
graphs
,
matrices
,
trees
2600
x203
1380F
Strange Addition
data structures
,
dp
,
matrices
2600
x782
1375I
Cubic Lattice
geometry
,
math
,
matrices
,
number theory
3500
x265
1344F
Piet's Palette
matrices
3200
x453
1335F
Robots on a Grid
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
matrices
2200
x2183
1332E
Height All the Same
combinatorics
,
constructive algorithms
,
math
,
matrices
2100
x3832
1286D
LCC
data structures
,
math
,
matrices
,
probabilities
3100
x582
1266H
Red-Blue Graph
dp
,
graphs
,
math
,
matrices
,
meet-in-the-middle
3400
x104
1252K
Addition Robot
data structures
,
math
,
matrices
2100
x1851
1197F
Coloring Game
dp
,
games
,
matrices
2700
x258
1188B
Count Pairs
math
,
matrices
,
number theory
,
two pointers
2300
x4494
1184D2
Parallel Universes (Hard)
math
,
matrices
3100
x106
1182E
Product Oriented Recurrence
dp
,
math
,
matrices
,
number theory
2300
x2803
1152F2
Neko Rules the Catniverse (Large Version)
bitmasks
,
dp
,
matrices
3000
x640
1152F1
Neko Rules the Catniverse (Small Version)
bitmasks
,
dp
,
matrices
2800
x558
1151F
Sonya and Informatics
combinatorics
,
dp
,
matrices
,
probabilities
2300
x1210
1117D
Magic Gems
dp
,
math
,
matrices
2100
x4216
1106F
Lunar New Year and a Recursive Sequence
math
,
matrices
,
number theory
2400
x974
1101G
(Zero XOR Subset)-less
math
,
matrices
2300
x1703
1025E
Colored Cubes
constructive algorithms
,
implementation
,
matrices
2700
x565
1023E
Down or Right
constructive algorithms
,
interactive
,
matrices
2100
x2017
1012B
Chemical table
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
matrices
1900
x3932
989E
A Trance of Nightfall
dp
,
geometry
,
matrices
,
probabilities
2700
x235
959F
Mahmoud and Ehab and yet another xor task
bitmasks
,
dp
,
math
,
matrices
2400
x2078
954F
Runner's Problem
dp
,
matrices
,
sortings
2100
x1208
946F
Fibonacci String Subsequences
combinatorics
,
dp
,
matrices
2400
x556
923E
Perpetual Subtraction
fft
,
math
,
matrices
3100
x452
917D
Stranger Trees
dp
,
math
,
matrices
,
trees
2600
x1133
917C
Pollywog
combinatorics
,
dp
,
matrices
2900
x390
891E
Lust
combinatorics
,
math
,
matrices
3000
x925
865G
Flowers and Chocolate
combinatorics
,
math
,
matrices
3300
x135
852B
Neural Network country
dp
,
matrices
2000
x1436
837F
Prefix Sums
binary search
,
brute force
,
combinatorics
,
math
,
matrices
2400
x956
832E
Vasya and Shifts
matrices
2600
x324
821E
Okabe and El Psy Kongroo
dp
,
matrices
2100
x1458
780F
Axel and Marston in Bitland
bitmasks
,
dp
,
graphs
,
matrices
2400
x1048
750E
New Year and Old Subsequence
data structures
,
divide and conquer
,
dp
,
matrices
2600
x1561
736D
Permutations
math
,
matrices
2800
x459
718C
Sasha and Array
data structures
,
math
,
matrices
2300
x3827
717D
Dexterina’s Lab
games
,
matrices
,
probabilities
1900
x1405
696D
Legen...
data structures
,
dp
,
matrices
,
strings
2500
x1295
696C
PLEASE
combinatorics
,
dp
,
implementation
,
math
,
matrices
2000
x2078
691E
Xor-sequences
matrices
1900
x2509
662A
Gambling Nim
bitmasks
,
math
,
matrices
,
probabilities
2400
x465
632F
Magic Matrix
brute force
,
divide and conquer
,
graphs
,
matrices
,
trees
2400
x1074
621E
Wet Shark and Blocks
dp
,
matrices
2000
x2800
618G
Combining Slimes
dp
,
math
,
matrices
,
probabilities
3300
x235
593E
Strange Calculation and Cats
dp
,
matrices
2400
x617
582B
Once Again...
constructive algorithms
,
dp
,
matrices
1900
x3426
578F
Mirror Box
matrices
,
trees
3200
x547
576D
Flights for Regular Customers
dp
,
matrices
2700
x1369
575A
Fibonotci
data structures
,
math
,
matrices
2700
x796
551D
GukiZ and Binary Operations
combinatorics
,
implementation
,
math
,
matrices
,
number theory
2100
x1956
514E
Darth Vader and Tree
dp
,
matrices
2200
x1421
506E
Mr. Kitayuta's Gift
combinatorics
,
dp
,
matrices
,
strings
3000
x731
498E
Stairs and Lines
dp
,
matrices
2700
x465
497E
Subsequences Return
dp
,
matrices
2900
x285
485A
Factory
implementation
,
math
,
matrices
1400
x8246
472F
Design Tutorial: Change the Goal
constructive algorithms
,
math
,
matrices
2700
x256
453D
Little Pony and Elements of Harmony
dp
,
matrices
3000
x469
446E
DZY Loves Bridges
math
,
matrices
3100
x133
446D
DZY Loves Games
math
,
matrices
,
probabilities
2800
x394
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