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Codeforces Round 959 sponsored by NEAR (Div. 1 + Div. 2)
03:59:49
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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
818F
Level Generation
binary search
,
math
,
ternary search
2100
x1504
818E
Card Game Again
binary search
,
data structures
,
number theory
,
two pointers
1900
x2099
818D
Multicolored Cars
data structures
,
implementation
1700
x3425
818C
Sofa Thief
brute force
,
implementation
2000
x1224
817F
MEX Queries
binary search
,
data structures
,
trees
2300
x2476
817E
Choosing The Commander
bitmasks
,
data structures
,
trees
2000
x2766
817D
Imbalanced Array
data structures
,
divide and conquer
,
dsu
,
sortings
1900
x4538
815E
Karen and Neighborhood
binary search
,
constructive algorithms
,
implementation
2900
x221
815D
Karen and Cards
binary search
,
combinatorics
,
data structures
,
geometry
2800
x599
815C
Karen and Supermarket
brute force
,
dp
,
trees
2400
x2544
815B
Karen and Test
brute force
,
combinatorics
,
constructive algorithms
,
math
2200
x1366
815A
Karen and Game
brute force
,
greedy
,
implementation
1700
x5591
814E
An unavoidable detour for home
combinatorics
,
dp
,
graphs
,
shortest paths
2600
x644
814D
An overnight dance in discotheque
dfs and similar
,
dp
,
geometry
,
greedy
,
trees
2000
x2188
813F
Bipartite Checking
data structures
,
dsu
,
graphs
2500
x1253
813E
Army Creation
binary search
,
data structures
2200
x2330
813D
Two Melodies
dp
,
flows
2600
x992
813C
The Tag Game
dfs and similar
,
graphs
1700
x5802
813B
The Golden Age
brute force
,
math
1800
x3870
812E
Sagheer and Apple Tree
games
,
trees
2300
x1044
812D
Sagheer and Kindergarten
dfs and similar
,
graphs
,
implementation
,
trees
2700
x329
811E
Vladik and Entertaining Flags
data structures
,
dsu
,
graphs
2600
x852
811D
Vladik and Favorite Game
constructive algorithms
,
dfs and similar
,
graphs
,
interactive
2100
x1749
811C
Vladik and Memorable Trip
dp
,
implementation
1900
x3217
809E
Surprise me!
divide and conquer
,
math
,
number theory
,
trees
3100
x725
809D
Hitchhiking in the Baltic States
data structures
,
dp
2900
x812
809C
Find a car
combinatorics
,
divide and conquer
,
dp
2600
x734
809B
Glad to see you!
binary search
,
interactive
2200
x1643
808G
Anthem of Berland
dp
,
strings
2300
x2512
808F
Card Game
binary search
,
flows
,
graphs
2400
x1134
808E
Selling Souvenirs
binary search
,
dp
,
greedy
,
ternary search
2300
x1787
808D
Array Division
binary search
,
data structures
,
implementation
1900
x6871
804F
Fake bullions
combinatorics
,
dfs and similar
,
dp
,
graphs
,
number theory
3400
x161
804E
The same permutation
constructive algorithms
3100
x412
804D
Expected diameter of a tree
binary search
,
brute force
,
dfs and similar
,
dp
,
sortings
,
trees
2500
x1265
804C
Ice cream coloring
constructive algorithms
,
dfs and similar
,
greedy
2200
x1831
803G
Periodic RMQ Problem
data structures
2300
x1373
803F
Coprime Subsequences
bitmasks
,
combinatorics
,
number theory
2000
x3112
803E
Roma and Poker
dp
,
graphs
2000
x2138
803D
Magazine Ad
binary search
,
greedy
1900
x3167
803C
Maximal GCD
constructive algorithms
,
greedy
,
math
1900
x5005
802O
April Fools' Problem (hard)
binary search
,
data structures
,
flows
2900
x888
802N
April Fools' Problem (medium)
binary search
,
flows
,
graphs
2400
x1149
802L
Send the Fool Further! (hard)
dfs and similar
,
dp
,
math
,
trees
2400
x293
802K
Send the Fool Further! (medium)
dp
,
trees
2100
x609
802I
Fake News (hard)
string suffix structures
2300
x1458
802H
Fake News (medium)
constructive algorithms
,
strings
2200
x436
802F
Marmots (hard)
math
,
probabilities
2800
x121
802E
Marmots (medium)
math
2200
x240
802D
Marmots (easy)
math
2100
x442
802C
Heidi and Library (hard)
flows
2600
x549
802B
Heidi and Library (medium)
data structures
,
greedy
1800
x1103
802A
Heidi and Library (easy)
greedy
1800
x1351
799G
Cut the pie
binary search
,
data structures
,
geometry
3500
x111
799F
Beautiful fountains rows
data structures
3500
x428
799E
Aquarium decoration
data structures
,
greedy
,
two pointers
2500
x927
799D
Field expansion
brute force
,
dp
,
meet-in-the-middle
2100
x2006
799C
Fountains
binary search
,
data structures
,
implementation
1800
x3688
798E
Mike and code of a permutation
constructive algorithms
,
data structures
,
graphs
,
sortings
3000
x466
798D
Mike and distribution
constructive algorithms
,
sortings
2400
x1867
798C
Mike and gcd problem
dp
,
greedy
,
number theory
1700
x5685
797F
Mice and Holes
data structures
,
dp
,
greedy
,
sortings
2600
x1148
797E
Array Queries
brute force
,
data structures
,
dp
2000
x4187
797D
Broken BST
data structures
,
dfs and similar
2100
x1781
797C
Minimal string
data structures
,
greedy
,
strings
1700
x6447
796F
Sequence Recovery
bitmasks
,
data structures
,
greedy
2800
x176
796E
Exam Cheating
binary search
,
dp
2400
x644
796D
Police Stations
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
shortest paths
,
trees
2100
x5467
796C
Bank Hacking
constructive algorithms
,
data structures
,
dp
,
trees
1900
x2999
794G
Replace All
combinatorics
,
dp
,
math
3400
x329
794F
Leha and security system
data structures
2800
x790
794E
Choosing Carrot
games
,
math
2800
x712
794D
Labelling Cities
dfs and similar
,
graphs
,
hashing
2400
x774
794C
Naming Company
games
,
greedy
,
sortings
1800
x3073
793G
Oleg and chess
data structures
,
divide and conquer
,
flows
,
graph matchings
3400
x371
793F
Julia the snail
data structures
,
divide and conquer
,
dp
3000
x536
793E
Problem of offices
constructive algorithms
,
dfs and similar
,
dp
,
trees
2900
x245
793D
Presents in Bankopolis
dp
,
graphs
,
shortest paths
2100
x1587
793C
Mice problem
geometry
,
implementation
,
math
,
sortings
2300
x1241
792F
Mages and Monsters
data structures
,
geometry
3100
x201
792E
Colored Balls
greedy
,
math
,
number theory
2500
x1055
792D
Paths in a Complete Binary Tree
bitmasks
,
trees
1900
x2931
792C
Divide by Three
dp
,
greedy
,
math
,
number theory
2000
x4298
789B
Masha and geometric depression
brute force
,
implementation
,
math
1700
x4361
788E
New task
data structures
2900
x333
788D
Finding lines
constructive algorithms
,
divide and conquer
,
interactive
3000
x361
788C
The Great Mixing
dfs and similar
,
graphs
,
shortest paths
2300
x2081
788B
Weird journey
combinatorics
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2100
x2499
786E
ALT
data structures
,
flows
,
graphs
,
trees
3200
x610
786D
Rap God
data structures
,
dfs and similar
,
hashing
,
strings
,
trees
3400
x139
786C
Till I Collapse
data structures
,
divide and conquer
2400
x2632
786B
Legacy
data structures
,
graphs
,
shortest paths
2300
x5648
786A
Berzerk
dfs and similar
,
dp
,
games
2000
x2391
785E
Anton and Permutation
brute force
,
data structures
2200
x1847
785D
Anton and School - 2
combinatorics
,
dp
,
math
,
number theory
2300
x2724
784G
BF Calculator
*special problem
2000
x736
784F
Crunching Numbers Just for You
*special problem
,
implementation
1900
x1019
784E
Twisted Circuit
*special problem
,
brute force
,
implementation
2000
x1910
784D
Touchy-Feely Palindromes
*special problem
,
implementation
1900
x435
784C
INTERCALC
*special problem
,
implementation
1800
x697
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