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Codeforces Round 959 sponsored by NEAR (Div. 1 + Div. 2)
00:19:22
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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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Problems
#
Name
926B
Add Points
math
,
number theory
1800
x1624
925F
Parametric Circulation
binary search
,
flows
3100
x108
925E
May Holidays
data structures
,
trees
2900
x378
925D
Aztec Catacombs
constructive algorithms
2600
x481
925C
Big Secret
constructive algorithms
,
math
2200
x1287
925B
Resource Distribution
binary search
,
implementation
,
sortings
1700
x2184
924F
Minimal Subset Difference
dp
3200
x164
924E
Wardrobe
dp
,
greedy
2700
x510
924D
Contact ATC
2500
x827
924C
Riverside Curio
data structures
,
dp
,
greedy
1700
x3735
923F
Public Service
constructive algorithms
,
graphs
,
trees
3200
x74
923E
Perpetual Subtraction
fft
,
math
,
matrices
3100
x444
923D
Picking Strings
constructive algorithms
,
implementation
,
strings
2500
x1176
923C
Perfect Security
data structures
,
greedy
,
strings
,
trees
1800
x4209
923A
Primal Sport
math
,
number theory
1700
x4995
922F
Divisibility
constructive algorithms
,
dp
,
greedy
,
number theory
2400
x628
922E
Birds
dp
2200
x2048
922D
Robot Vacuum Cleaner
greedy
,
sortings
1800
x4312
92114
Labyrinth-14
3200
92113
Labyrinth-13
3200
92112
Labyrinth-12
3200
92111
Labyrinth-11
3200
92110
Labyrinth-10
3200
92109
Labyrinth-9
3200
92108
Labyrinth-8
3200
92107
Labyrinth-7
3200
92106
Labyrinth-6
3200
92105
Labyrinth-5
3200
92104
Labyrinth-4
3200
92103
Labyrinth-3
3200
92102
Labyrinth-2
3200
92101
Labyrinth-1
3200
920G
List Of Integers
binary search
,
bitmasks
,
brute force
,
combinatorics
,
math
,
number theory
2200
x1709
920F
SUM and REPLACE
brute force
,
data structures
,
dsu
,
number theory
2000
x6460
920E
Connected Components?
data structures
,
dfs and similar
,
dsu
,
graphs
2100
x6110
920D
Tanks
dp
,
greedy
,
implementation
2400
x691
919F
A Game With Numbers
games
,
graphs
,
shortest paths
2600
x329
919E
Congruence Equation
chinese remainder theorem
,
math
,
number theory
2100
x2045
919D
Substring
dfs and similar
,
dp
,
graphs
1700
x9632
917E
Upside Down
data structures
,
string suffix structures
,
strings
,
trees
3400
x125
917D
Stranger Trees
dp
,
math
,
matrices
,
trees
2600
x1105
917C
Pollywog
combinatorics
,
dp
,
matrices
2900
x387
917B
MADMAX
dfs and similar
,
dp
,
games
,
graphs
1700
x3504
917A
The Monster
dp
,
greedy
,
implementation
,
math
1800
x3492
916E
Jamie and Tree
data structures
,
trees
2400
x1619
916D
Jamie and To-do List
data structures
,
interactive
,
trees
2200
x504
916B
Jamie and Binary Sequence (changed after round)
bitmasks
,
greedy
,
math
2000
x1734
915G
Coprime Arrays
math
,
number theory
2300
x1162
915F
Imbalance Value of a Tree
data structures
,
dsu
,
graphs
,
trees
2400
x2362
915E
Physical Education Lessons
data structures
,
implementation
,
sortings
2300
x4136
915D
Almost Acyclic Graph
dfs and similar
,
graphs
2200
x3354
915C
Permute Digits
dp
,
greedy
1700
x6953
914H
Ember and Storm's Tree Game
combinatorics
,
dp
,
games
,
trees
3400
x235
914G
Sum the Fibonacci
bitmasks
,
divide and conquer
,
dp
,
fft
,
math
2600
x907
914F
Substrings in a String
bitmasks
,
brute force
,
data structures
,
string suffix structures
,
strings
3000
x1552
914E
Palindromes in a Tree
bitmasks
,
data structures
,
divide and conquer
,
trees
2400
x1437
914D
Bash and a Tough Math Puzzle
data structures
,
number theory
1900
x5172
914C
Travelling Salesman and Special Numbers
brute force
,
combinatorics
,
dp
1800
x3674
913H
Don't Exceed
math
,
probabilities
3400
x124
913G
Power Substring
math
,
number theory
3200
x198
913F
Strongly Connected Tournament
dp
,
graphs
,
math
,
probabilities
2800
x632
913E
Logical Expression
bitmasks
,
dp
,
shortest paths
2400
x762
913D
Too Easy Problems
binary search
,
brute force
,
data structures
,
greedy
,
sortings
1800
x4653
912E
Prime Gift
binary search
,
dfs and similar
,
math
,
meet-in-the-middle
,
number theory
,
two pointers
2400
x1515
912D
Fishes
data structures
,
graphs
,
greedy
,
probabilities
,
shortest paths
2100
x1972
912C
Perun, Ult!
brute force
,
greedy
,
sortings
2500
x513
911G
Mass Change Queries
data structures
2500
x2725
911F
Tree Destruction
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
trees
2400
x1603
911E
Stack Sorting
constructive algorithms
,
data structures
,
greedy
,
implementation
2000
x2496
911D
Inversion Counting
brute force
,
math
1800
x4529
910C
Minimum Sum
constructive algorithms
,
greedy
,
math
1700
x1756
909F
AND-permutations
constructive algorithms
2500
x522
909E
Coprocessor
dfs and similar
,
dp
,
graphs
,
greedy
1900
x2022
909D
Colorful Points
data structures
,
greedy
,
implementation
2100
x1919
909C
Python Indentation
dp
1800
x4818
908H
New Year and Boolean Bridges
3100
x376
908G
New Year and Original Order
dp
,
math
2800
x1301
908F
New Year and Rainbow Roads
graphs
,
greedy
,
implementation
2400
x1384
908E
New Year and Entity Enumeration
bitmasks
,
combinatorics
,
dp
,
math
2500
x750
908D
New Year and Arbitrary Arrangement
dp
,
math
,
probabilities
2200
x2297
906E
Reverses
dp
,
string suffix structures
,
strings
3300
x437
906D
Power Tower
chinese remainder theorem
,
math
,
number theory
2700
x2030
906C
Party
bitmasks
,
brute force
,
dp
,
graphs
2400
x1233
906B
Seating of Students
brute force
,
constructive algorithms
,
math
2200
x1127
903G
Yet Another Maxflow Problem
data structures
,
flows
,
graphs
2700
x519
903F
Clear The Matrix
bitmasks
,
dp
2200
x628
903E
Swapping Characters
brute force
,
hashing
,
implementation
,
strings
2200
x1450
903D
Almost Difference
data structures
,
math
2200
x3730
901E
Cyclic Cipher
fft
,
math
3300
x85
901D
Weighting a Tree
constructive algorithms
,
dfs and similar
,
graphs
2700
x437
901C
Bipartite Segments
binary search
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
two pointers
2300
x1154
901B
GCD of Polynomials
constructive algorithms
,
math
2200
x1572
900E
Maximum Questions
data structures
,
dp
,
strings
2100
x1217
900D
Unusual Sequences
bitmasks
,
combinatorics
,
dp
,
math
,
number theory
2000
x3113
900C
Remove Extra One
brute force
,
data structures
,
math
1700
x4513
899F
Letters Removing
data structures
,
strings
2100
x1792
899E
Segments Removal
data structures
,
dsu
,
flows
,
implementation
,
two pointers
2000
x2882
899D
Shovel Sale
constructive algorithms
,
math
1800
x2725
898F
Restoring the Expression
brute force
,
hashing
,
math
2300
x1143
896E
Welcome home, Chtholly
data structures
,
dsu
3100
x2070
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