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Codeforces Round 974 (Div. 3)
02:13:35
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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
1168B
Good Triple
brute force
,
two pointers
1900
x3555
1168A
Increasing by Modulo
binary search
,
greedy
1700
x6781
1167G
Low Budget Inception
brute force
,
geometry
3100
x149
1167F
Scalar Queries
combinatorics
,
data structures
,
math
,
sortings
2300
x1620
1167E
Range Deleting
binary search
,
combinatorics
,
data structures
,
two pointers
2100
x2655
1166F
Vicky's Delivery Service
data structures
,
dsu
,
graphs
,
hashing
2400
x701
1166E
The LCMs Must be Large
bitmasks
,
brute force
,
constructive algorithms
,
math
,
number theory
2100
x2820
1166D
Cute Sequences
binary search
,
brute force
,
greedy
,
math
2200
x2159
1165F2
Microtransactions (hard version)
binary search
,
greedy
,
implementation
2000
x2171
1165F1
Microtransactions (easy version)
binary search
,
greedy
2000
x1887
1165E
Two Arrays and Sum of Functions
greedy
,
math
,
sortings
1600
x8275
1165D
Almost All Divisors
math
,
number theory
1600
x15932
1163F
Indecisive Taxi Fee
data structures
,
graphs
,
shortest paths
3000
x874
1163E
Magical Permutation
bitmasks
,
brute force
,
constructive algorithms
,
data structures
,
graphs
,
math
2400
x665
1163D
Mysterious Code
dp
,
strings
2100
x1266
1163C2
Power Transmission (Hard Edition)
data structures
,
geometry
,
implementation
,
math
1900
x3619
1163C1
Power Transmission (Easy Edition)
brute force
,
geometry
1900
x3310
1163B2
Cat Party (Hard Edition)
data structures
,
implementation
1600
x7202
1158F
Density of subarrays
dp
,
math
3500
x409
1158E
Strange device
binary search
,
interactive
,
math
,
trees
3400
x151
1158D
Winding polygonal line
constructive algorithms
,
geometry
,
greedy
,
math
2600
x836
1158C
Permutation recovery
constructive algorithms
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
math
,
sortings
2100
x1936
1158B
The minimal unique substring
constructive algorithms
,
math
,
strings
2200
x2224
1157G
Inverse of Rows and Columns
brute force
,
constructive algorithms
2200
x913
1157F
Maximum Balanced Circle
constructive algorithms
,
dp
,
greedy
,
two pointers
2000
x2629
1157E
Minimum Array
binary search
,
data structures
,
greedy
1700
x8357
1157D
N Problems During K Days
constructive algorithms
,
greedy
,
math
1900
x3740
1157C2
Increasing Subsequence (hard version)
greedy
1700
x7974
1156G
Optimizer
graphs
,
greedy
,
hashing
,
implementation
2700
x129
1156F
Card Bag
dp
,
math
,
probabilities
2300
x1394
1156E
Special Segments of Permutation
data structures
,
divide and conquer
,
dsu
,
two pointers
2200
x3000
1156D
0-1-Tree
dfs and similar
,
divide and conquer
,
dp
,
dsu
,
trees
2200
x3875
1156C
Match Points
binary search
,
greedy
,
sortings
,
ternary search
,
two pointers
2000
x6071
1156B
Ugly Pairs
dfs and similar
,
greedy
,
implementation
,
sortings
,
strings
1800
x6210
1155F
Delivery Oligopoly
brute force
,
dp
,
graphs
2800
x416
1155E
Guess the Root
brute force
,
interactive
,
math
2200
x1424
1155D
Beautiful Array
brute force
,
data structures
,
divide and conquer
,
dp
,
greedy
1900
x6900
1154G
Minimum Possible LCM
brute force
,
greedy
,
math
,
number theory
2200
x2727
1154F
Shovels Shop
dp
,
greedy
,
sortings
2100
x2833
1154E
Two Teams
data structures
,
implementation
,
sortings
1800
x6253
1153F
Serval and Bonus Problem
combinatorics
,
dp
,
math
,
probabilities
2600
x793
1153E
Serval and Snake
binary search
,
brute force
,
interactive
2200
x1496
1153D
Serval and Rooted Tree
binary search
,
dfs and similar
,
dp
,
greedy
,
trees
1900
x4962
1153C
Serval and Parenthesis Sequence
greedy
,
strings
1700
x7390
1152F2
Neko Rules the Catniverse (Large Version)
bitmasks
,
dp
,
matrices
3000
x640
1152F1
Neko Rules the Catniverse (Small Version)
bitmasks
,
dp
,
matrices
2800
x558
1152E
Neko and Flashback
constructive algorithms
,
dfs and similar
,
graphs
2400
x971
1152D
Neko and Aki's Prank
dp
,
greedy
,
trees
2100
x2415
1152C
Neko does Maths
brute force
,
math
,
number theory
1800
x6653
1151F
Sonya and Informatics
combinatorics
,
dp
,
matrices
,
probabilities
2300
x1212
1151E
Number of Components
combinatorics
,
data structures
,
dp
,
math
2100
x3322
1151D
Stas and the Queue at the Buffet
greedy
,
math
,
sortings
1600
x8390
1151C
Problem for Nazar
constructive algorithms
,
math
1800
x5333
1151B
Dima and a Bad XOR
bitmasks
,
brute force
,
constructive algorithms
,
dp
1600
x11132
1149E
Election Promises
games
,
graphs
3200
x523
1149D
Abandoning Roads
brute force
,
dp
,
graphs
,
greedy
3000
x780
1149C
Tree Generator™
data structures
,
implementation
,
trees
2700
x1253
1149B
Three Religions
dp
,
implementation
,
strings
2200
x1894
1148H
Holy Diver
data structures
3500
x257
1148G
Gold Experience
constructive algorithms
,
graphs
,
math
,
number theory
,
probabilities
3300
x320
1148F
Foo Fighters
bitmasks
,
constructive algorithms
2700
x1008
1148E
Earth Wind and Fire
constructive algorithms
,
greedy
,
math
,
sortings
,
two pointers
2300
x1672
1148D
Dirty Deeds Done Dirt Cheap
greedy
,
sortings
1800
x4965
1148C
Crazy Diamond
constructive algorithms
,
sortings
1700
x5292
1148B
Born This Way
binary search
,
brute force
,
two pointers
1600
x7379
1147F
Zigzag Game
games
,
interactive
3500
x263
1147E
Rainbow Coins
interactive
3000
x338
1147D
Palindrome XOR
dfs and similar
,
graphs
2400
x747
1147C
Thanos Nim
games
2000
x3248
1147B
Chladni Figure
brute force
,
strings
1900
x2872
1146H
Satanic Panic
dp
,
geometry
2900
x607
1146G
Zoning Restrictions
dp
,
flows
,
graphs
2700
x820
1146F
Leaf Partition
dp
,
trees
2500
x1171
1146E
Hot is Cold
bitmasks
,
data structures
,
divide and conquer
,
implementation
2400
x887
1146D
Frog Jumping
dfs and similar
,
math
,
number theory
2100
x1098
1146C
Tree Diameter
bitmasks
,
graphs
,
interactive
1700
x3677
1144G
Two Merged Sequences
dp
,
greedy
2400
x1968
1144F
Graph Without Long Directed Paths
dfs and similar
,
graphs
1700
x11554
1144E
Median String
bitmasks
,
math
,
number theory
,
strings
1900
x4144
1142E
Pink Floyd
graphs
,
interactive
3200
x509
1142D
Foreigner
dp
2800
x500
1142C
U2
geometry
2400
x1347
1142B
Lynyrd Skynyrd
data structures
,
dfs and similar
,
dp
,
math
,
trees
2000
x2935
1142A
The Beatles
brute force
,
math
1700
x3416
1141G
Privatization of Roads in Treeland
binary search
,
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
trees
1900
x2264
1141F2
Same Sum Blocks (Hard)
data structures
,
greedy
1900
x4183
1141F1
Same Sum Blocks (Easy)
greedy
1900
x3847
1141E
Superhero Battle
math
1700
x6728
1140G
Double Tree
data structures
,
divide and conquer
,
shortest paths
,
trees
2700
x493
1140F
Extending Set of Points
data structures
,
divide and conquer
,
dsu
2600
x1204
1140E
Palindrome-less Arrays
combinatorics
,
divide and conquer
,
dp
2200
x1928
1140C
Playlist
brute force
,
data structures
,
sortings
1600
x9535
1139F
Dish Shopping
data structures
,
divide and conquer
2500
x432
1139E
Maximize Mex
flows
,
graph matchings
,
graphs
2400
x1804
1139D
Steps to One
dp
,
math
,
number theory
,
probabilities
2300
x2293
1138B
Circus
brute force
,
greedy
,
math
,
strings
1800
x4019
1137F
Matches Are Not a Child's Play
data structures
,
trees
3400
x466
1137E
Train Car Selection
data structures
,
greedy
2700
x509
1137D
Cooperative Game
constructive algorithms
,
interactive
,
number theory
2400
x1583
1137C
Museums Tour
dp
,
graphs
,
implementation
2500
x1200
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