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Codeforces Round 986 (Div. 2)
11:46:27
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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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Problems
#
Name
2036D
I Love 1543
brute force
,
implementation
,
matrices
x10153
2023F
Hills and Pits
data structures
,
greedy
,
math
,
matrices
3500
x52
2018D
Max Plus Min Plus Size
data structures
,
dp
,
dsu
,
greedy
,
implementation
,
matrices
,
sortings
2200
x1560
2004G
Substring Compression
data structures
,
dp
,
matrices
3200
x300
1995E2
Let Me Teach You a Lesson (Hard Version)
data structures
,
dp
,
matrices
,
two pointers
2900
x300
1995E1
Let Me Teach You a Lesson (Easy Version)
2-sat
,
data structures
,
dp
,
matrices
,
two pointers
2700
x378
1980E
Permutation of Rows and Columns
constructive algorithms
,
data structures
,
greedy
,
hashing
,
implementation
,
math
,
matrices
,
sortings
1600
x10488
1970E3
Trails (Hard)
dp
,
matrices
2200
x740
1970E2
Trails (Medium)
dp
,
matrices
2000
x1290
1924C
Fractal Origami
geometry
,
math
,
matrices
2400
x1176
1919F2
Wine Factory (Hard Version)
data structures
,
dp
,
flows
,
greedy
,
matrices
2800
x865
1916H2
Matrix Rank (Hard Version)
combinatorics
,
dp
,
math
,
matrices
,
string suffix structures
2700
x539
1916H1
Matrix Rank (Easy Version)
brute force
,
combinatorics
,
dp
,
math
,
matrices
2700
x616
1895F
Fancy Arrays
combinatorics
,
dp
,
math
,
matrices
2600
x767
1864H
Asterism Stream
dp
,
math
,
matrices
3200
x285
1844G
Tree Weights
bitmasks
,
constructive algorithms
,
data structures
,
dfs and similar
,
implementation
,
math
,
matrices
,
number theory
,
trees
3000
x734
1814E
Chain Chips
data structures
,
dp
,
matrices
2300
x1371
1808E2
Minibuses on Venus (medium version)
combinatorics
,
divide and conquer
,
dp
,
matrices
2500
x696
1761E
Make It Connected
binary search
,
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
matrices
,
trees
,
two pointers
2400
x1859
1743F
Intersection and Union
data structures
,
dp
,
matrices
,
probabilities
2300
x1524
1713E
Cross Swapping
2-sat
,
data structures
,
dsu
,
greedy
,
matrices
2400
x1701
1701F
Points
combinatorics
,
data structures
,
implementation
,
math
,
matrices
2500
x950
1699B
Almost Ternary Matrix
bitmasks
,
constructive algorithms
,
matrices
900
x19876
1698G
Long Binary String
bitmasks
,
math
,
matrices
,
meet-in-the-middle
,
number theory
2900
x318
1681E
Labyrinth Adventures
data structures
,
dp
,
matrices
,
shortest paths
2600
x799
1672G
Cross Xor
constructive algorithms
,
graphs
,
math
,
matrices
3200
x323
1662C
European Trip
dp
,
graphs
,
math
,
matrices
x338
1648A
Weird Sum
combinatorics
,
data structures
,
geometry
,
math
,
matrices
,
sortings
1400
x13098
1635D
Infinite Set
bitmasks
,
dp
,
math
,
matrices
,
number theory
,
strings
1800
x6297
1616F
Tricolor Triangles
brute force
,
graphs
,
math
,
matrices
2900
x595
1609E
William The Oblivious
bitmasks
,
data structures
,
dp
,
matrices
2400
x2132
1599E
Two Arrays
data structures
,
matrices
3200
x67
1557C
Moamen and XOR
bitmasks
,
combinatorics
,
dp
,
math
,
matrices
1700
x8649
1540E
Tasty Dishes
math
,
matrices
3500
x107
1538E
Funny Substrings
data structures
,
hashing
,
implementation
,
matrices
,
strings
2100
x2912
1513C
Add One
dp
,
matrices
1600
x14131
1511F
Chainword
brute force
,
data structures
,
dp
,
matrices
,
string suffix structures
,
strings
2700
x446
1474F
1 2 3 4 ...
dp
,
math
,
matrices
3000
x248
1458C
Latin Square
math
,
matrices
2700
x1337
1427E
Xum
bitmasks
,
constructive algorithms
,
math
,
matrices
,
number theory
2500
x1426
1411G
No Game No Life
bitmasks
,
games
,
math
,
matrices
2700
x674
1402C
Star Trek
*special problem
,
combinatorics
,
dfs and similar
,
dp
,
games
,
graphs
,
matrices
,
trees
2600
x205
1380F
Strange Addition
data structures
,
dp
,
matrices
2600
x788
1375I
Cubic Lattice
geometry
,
math
,
matrices
,
number theory
3500
x265
1344F
Piet's Palette
matrices
3200
x455
1335F
Robots on a Grid
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
matrices
2200
x2194
1332E
Height All the Same
combinatorics
,
constructive algorithms
,
math
,
matrices
2100
x3865
1286D
LCC
data structures
,
math
,
matrices
,
probabilities
3100
x597
1266H
Red-Blue Graph
dp
,
graphs
,
math
,
matrices
,
meet-in-the-middle
3400
x104
1252K
Addition Robot
data structures
,
math
,
matrices
2100
x1868
1197F
Coloring Game
dp
,
games
,
matrices
2700
x260
1188B
Count Pairs
math
,
matrices
,
number theory
,
two pointers
2300
x4572
1184D2
Parallel Universes (Hard)
math
,
matrices
3100
x106
1182E
Product Oriented Recurrence
dp
,
math
,
matrices
,
number theory
2300
x2851
1152F2
Neko Rules the Catniverse (Large Version)
bitmasks
,
dp
,
matrices
3000
x654
1152F1
Neko Rules the Catniverse (Small Version)
bitmasks
,
dp
,
matrices
2800
x569
1151F
Sonya and Informatics
combinatorics
,
dp
,
matrices
,
probabilities
2300
x1237
1117D
Magic Gems
dp
,
math
,
matrices
2100
x4324
1106F
Lunar New Year and a Recursive Sequence
math
,
matrices
,
number theory
2400
x988
1101G
(Zero XOR Subset)-less
math
,
matrices
2300
x1732
1025E
Colored Cubes
constructive algorithms
,
implementation
,
matrices
2700
x571
1023E
Down or Right
constructive algorithms
,
interactive
,
matrices
2100
x2035
1012B
Chemical table
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
matrices
1900
x3993
989E
A Trance of Nightfall
dp
,
geometry
,
matrices
,
probabilities
2700
x252
959F
Mahmoud and Ehab and yet another xor task
bitmasks
,
dp
,
math
,
matrices
2400
x2142
954F
Runner's Problem
dp
,
matrices
,
sortings
2100
x1216
946F
Fibonacci String Subsequences
combinatorics
,
dp
,
matrices
2400
x572
923E
Perpetual Subtraction
fft
,
math
,
matrices
3100
x454
917D
Stranger Trees
dp
,
math
,
matrices
,
trees
2600
x1157
917C
Pollywog
combinatorics
,
dp
,
matrices
2900
x404
891E
Lust
combinatorics
,
math
,
matrices
3000
x939
865G
Flowers and Chocolate
combinatorics
,
math
,
matrices
3300
x136
852B
Neural Network country
dp
,
matrices
2000
x1463
837F
Prefix Sums
binary search
,
brute force
,
combinatorics
,
math
,
matrices
2400
x982
832E
Vasya and Shifts
matrices
2600
x332
821E
Okabe and El Psy Kongroo
dp
,
matrices
2100
x1501
780F
Axel and Marston in Bitland
bitmasks
,
dp
,
graphs
,
matrices
2400
x1052
750E
New Year and Old Subsequence
data structures
,
divide and conquer
,
dp
,
matrices
2600
x1590
736D
Permutations
math
,
matrices
2800
x464
718C
Sasha and Array
data structures
,
math
,
matrices
2300
x3895
717D
Dexterina’s Lab
games
,
matrices
,
probabilities
1900
x1419
696D
Legen...
data structures
,
dp
,
matrices
,
strings
2500
x1310
696C
PLEASE
combinatorics
,
dp
,
implementation
,
math
,
matrices
2000
x2086
691E
Xor-sequences
matrices
1900
x2543
662A
Gambling Nim
bitmasks
,
math
,
matrices
,
probabilities
2400
x480
632F
Magic Matrix
brute force
,
divide and conquer
,
graphs
,
matrices
,
trees
2400
x1097
621E
Wet Shark and Blocks
dp
,
matrices
2000
x2868
618G
Combining Slimes
dp
,
math
,
matrices
,
probabilities
3300
x241
593E
Strange Calculation and Cats
dp
,
matrices
2400
x643
582B
Once Again...
constructive algorithms
,
dp
,
matrices
1900
x3440
578F
Mirror Box
matrices
,
trees
3200
x551
576D
Flights for Regular Customers
dp
,
matrices
2700
x1415
575A
Fibonotci
data structures
,
math
,
matrices
2700
x807
551D
GukiZ and Binary Operations
combinatorics
,
implementation
,
math
,
matrices
,
number theory
2100
x1966
514E
Darth Vader and Tree
dp
,
matrices
2200
x1445
506E
Mr. Kitayuta's Gift
combinatorics
,
dp
,
matrices
,
strings
3000
x748
498E
Stairs and Lines
dp
,
matrices
2700
x477
497E
Subsequences Return
dp
,
matrices
2900
x285
485A
Factory
implementation
,
math
,
matrices
1400
x8300
472F
Design Tutorial: Change the Goal
constructive algorithms
,
math
,
matrices
2700
x258
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