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Codeforces Round 968 (Div. 2)
36:13:27
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math
combine-tags-by-or
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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
1661C
Water the Trees
binary search
,
greedy
,
math
1700
x9242
1661A
Array Balancing
greedy
,
math
800
x18314
1660F2
Promising String (hard version)
data structures
,
implementation
,
math
,
strings
2100
x2684
1660F1
Promising String (easy version)
brute force
,
implementation
,
math
,
strings
1700
x7180
1660D
Maximum Product Strikes Back
brute force
,
implementation
,
math
,
two pointers
1600
x8546
1660B
Vlad and Candies
math
800
x27956
1660A
Vasya and Coins
greedy
,
math
800
x35719
1659D
Reverse Sort Sum
constructive algorithms
,
data structures
,
greedy
,
implementation
,
math
,
two pointers
1900
x3971
1659C
Line Empire
binary search
,
brute force
,
dp
,
greedy
,
implementation
,
math
1500
x10281
1659A
Red Versus Blue
constructive algorithms
,
greedy
,
implementation
,
math
1000
x18170
1658F
Juju and Binary String
brute force
,
constructive algorithms
,
greedy
,
math
2700
x751
1658E
Gojou and Matrix Game
data structures
,
dp
,
games
,
hashing
,
implementation
,
math
,
number theory
,
sortings
2500
x1034
1658D2
388535 (Hard Version)
bitmasks
,
brute force
,
data structures
,
math
2300
x2497
1658D1
388535 (Easy Version)
bitmasks
,
math
1600
x8992
1658C
Shinju and the Lost Permutation
constructive algorithms
,
math
1700
x9243
1658B
Marin and Anti-coprime Permutation
combinatorics
,
math
,
number theory
800
x18526
1658A
Marin and Photoshoot
constructive algorithms
,
implementation
,
math
800
x20267
1657E
Star MST
combinatorics
,
dp
,
graph matchings
,
math
2200
x2052
1657D
For Gamers. By Gamers.
binary search
,
brute force
,
greedy
,
math
,
sortings
2000
x4805
1657A
Integer Moves
brute force
,
math
800
x23912
1656H
Equal LCM Subsets
data structures
,
math
,
number theory
3200
x565
1656G
Cycle Palindrome
constructive algorithms
,
graphs
,
math
3200
x380
1656F
Parametric MST
binary search
,
constructive algorithms
,
graphs
,
greedy
,
math
,
sortings
2600
x1024
1656E
Equal Tree Sums
constructive algorithms
,
dfs and similar
,
math
,
trees
2200
x3410
1656D
K-good
constructive algorithms
,
math
,
number theory
1900
x6806
1656C
Make Equal With Mod
constructive algorithms
,
math
,
number theory
,
sortings
1200
x18966
1656B
Subtract Operation
data structures
,
greedy
,
math
,
two pointers
1100
x18491
1656A
Good Pairs
math
,
sortings
800
x19540
1654H
Three Minimums
combinatorics
,
constructive algorithms
,
divide and conquer
,
dp
,
fft
,
math
3500
x75
1654E
Arithmetic Operations
brute force
,
data structures
,
graphs
,
math
2300
x2069
1654D
Potion Brewing Class
dfs and similar
,
math
,
number theory
,
trees
2100
x2823
1651E
Sum of Matchings
brute force
,
combinatorics
,
constructive algorithms
,
dfs and similar
,
graph matchings
,
greedy
,
math
2600
x511
1650E
Rescheduling the Exam
binary search
,
data structures
,
greedy
,
implementation
,
math
,
sortings
1900
x4111
1650D
Twist the Permutation
brute force
,
constructive algorithms
,
implementation
,
math
1300
x12922
1650B
DIV + MOD
math
900
x27451
1648B
Integral Array
brute force
,
constructive algorithms
,
data structures
,
math
1800
x6356
1648A
Weird Sum
combinatorics
,
data structures
,
geometry
,
math
,
matrices
,
sortings
1400
x12551
1647D
Madoka and the Best School in Russia
constructive algorithms
,
dp
,
math
,
number theory
1900
x5236
1647A
Madoka and Math Dad
implementation
,
math
800
x22690
1646E
Power Board
brute force
,
dp
,
math
,
number theory
2200
x2392
1646C
Factorials and Powers of Two
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
math
1500
x13884
1646A
Square Counting
math
800
x24185
1644F
Basis
combinatorics
,
fft
,
math
,
number theory
2900
x321
1644E
Expand the Path
brute force
,
combinatorics
,
data structures
,
implementation
,
math
1900
x3075
1644D
Cross Coloring
data structures
,
implementation
,
math
1700
x7181
1641E
Special Positions
combinatorics
,
divide and conquer
,
fft
,
math
3300
x205
1641D
Two Arrays
bitmasks
,
brute force
,
combinatorics
,
greedy
,
hashing
,
math
,
two pointers
2700
x1134
1638C
Inversion Graph
data structures
,
dsu
,
graphs
,
math
1300
x14607
1638B
Odd Swap Sort
data structures
,
math
,
sortings
1100
x20741
1638A
Reverse
constructive algorithms
,
greedy
,
math
800
x21394
1637H
Minimize Inversions Number
data structures
,
greedy
,
math
,
sortings
3500
x313
1637G
Birthday
constructive algorithms
,
greedy
,
math
3000
x500
1637D
Yet Another Minimization Problem
dp
,
greedy
,
math
1800
x7627
1637B
MEX and Array
brute force
,
dp
,
greedy
,
math
1100
x14763
1635D
Infinite Set
bitmasks
,
dp
,
math
,
matrices
,
number theory
,
strings
1800
x6193
1634F
Fibonacci Additions
brute force
,
data structures
,
hashing
,
implementation
,
math
2700
x1586
1634D
Finding Zero
constructive algorithms
,
interactive
,
math
2000
x4320
1634B
Fortune Telling
bitmasks
,
math
1400
x16335
1633E
Spanning Tree Queries
binary search
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
,
sortings
,
trees
2400
x1509
1633C
Kill the Monster
brute force
,
math
1100
x19930
1632D
New Year Concert
binary search
,
data structures
,
greedy
,
math
,
number theory
,
two pointers
2000
x4604
1632C
Strange Test
binary search
,
bitmasks
,
brute force
,
dp
,
math
1600
x12632
1630E
Expected Components
combinatorics
,
math
,
number theory
,
probabilities
2900
x435
1629B
GCD Arrays
greedy
,
math
,
number theory
800
x23292
1628D2
Game on Sum (Hard Version)
combinatorics
,
dp
,
games
,
math
2400
x2033
1628D1
Game on Sum (Easy Version)
combinatorics
,
dp
,
games
,
math
2100
x3106
1628C
Grid Xor
constructive algorithms
,
greedy
,
implementation
,
interactive
,
math
2300
x3141
1628A
Meximum Array
binary search
,
constructive algorithms
,
greedy
,
implementation
,
math
,
two pointers
1400
x15500
1627D
Not Adding
brute force
,
dp
,
math
,
number theory
1900
x8169
1626F
A Random Code Problem
combinatorics
,
dp
,
math
,
number theory
,
probabilities
2800
x726
1626D
Martial Arts Tournament
binary search
,
brute force
,
greedy
,
math
2100
x3885
1626C
Monsters And Spells
binary search
,
data structures
,
dp
,
greedy
,
implementation
,
math
,
two pointers
1700
x10845
1625D
Binary Spiders
bitmasks
,
data structures
,
implementation
,
math
,
sortings
,
trees
2300
x2027
1625A
Ancient Civilization
bitmasks
,
greedy
,
math
800
x17148
1624C
Division by Two and Permutation
constructive algorithms
,
flows
,
graph matchings
,
greedy
,
math
1100
x24678
1624B
Make AP
implementation
,
math
900
x36031
1624A
Plus One on the Subset
math
800
x51277
1623D
Robot Cleaner Revisit
implementation
,
math
,
probabilities
2300
x1362
1623A
Robot Cleaner
brute force
,
implementation
,
math
800
x20002
1622F
Quadratic Set
constructive algorithms
,
hashing
,
math
,
number theory
2900
x627
1622D
Shuffle
combinatorics
,
math
,
two pointers
2000
x3981
1622B
Berland Music
data structures
,
greedy
,
math
,
sortings
1000
x20839
1622A
Construct a Rectangle
geometry
,
math
800
x29883
1621G
Weighted Increasing Subsequences
data structures
,
dp
,
math
3200
x645
1621D
The Winter Hike
constructive algorithms
,
greedy
,
math
2100
x4026
1621C
Hidden Permutations
dfs and similar
,
interactive
,
math
1700
x6839
1620C
BA-String
brute force
,
dp
,
greedy
,
implementation
,
math
1800
x6508
1620B
Triangles on a Rectangle
geometry
,
greedy
,
math
1000
x20718
1619F
Let's Play the Hat?
brute force
,
constructive algorithms
,
greedy
,
math
2000
x2078
1619E
MEX and Increments
constructive algorithms
,
data structures
,
dp
,
greedy
,
implementation
,
math
,
sortings
1700
x9069
1619B
Squares and Cubes
implementation
,
math
800
x30604
1618F
Reverse
bitmasks
,
constructive algorithms
,
dfs and similar
,
implementation
,
math
,
strings
2000
x4165
1618E
Singers' Tour
constructive algorithms
,
math
1700
x7116
1618D
Array and Operations
dp
,
greedy
,
math
1300
x18769
1618C
Paint the Array
math
1100
x22619
1618A
Polycarp and Sums of Subsequences
math
,
sortings
800
x32132
1617E
Christmas Chocolates
dfs and similar
,
dp
,
games
,
graphs
,
implementation
,
math
,
number theory
,
shortest paths
,
trees
2700
x857
1617D2
Too Many Impostors (hard version)
constructive algorithms
,
implementation
,
interactive
,
math
2400
x1768
1617C
Paprika and Permutation
binary search
,
greedy
,
math
,
sortings
1300
x14880
1617B
GCD Problem
brute force
,
constructive algorithms
,
math
,
number theory
900
x23082
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