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Codeforces Round 974 (Div. 3)
10:06:03
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Difficulty:
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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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Custom test
Problems
#
Name
1491C
Pekora and Trampoline
brute force
,
data structures
,
dp
,
greedy
,
implementation
1700
x7890
1490G
Old Floppy Drive
binary search
,
data structures
,
math
1900
x5634
1488J
Flower Shop
*special problem
,
data structures
,
fft
,
math
3100
x35
1488I
Demonic Invasion
*special problem
,
flows
3100
x37
1488H
Build From Suffixes
*special problem
,
combinatorics
,
data structures
2800
x58
1488G
Painting Numbers
*special problem
,
data structures
,
greedy
,
number theory
2500
x123
1488F
Dogecoin
*special problem
,
*special problem
,
binary search
,
data structures
2300
x176
1488E
Palindromic Doubles
*special problem
,
data structures
,
dp
2200
x212
1488D
Problemsolving Marathon
*special problem
,
binary search
,
greedy
1900
x337
1488C
Two Policemen
*special problem
,
binary search
,
brute force
,
math
1900
x405
1488B
RBS Deletion
*special problem
,
greedy
1800
x558
1487G
String Counting
combinatorics
,
dp
,
fft
,
math
2700
x595
1487F
Ones
dp
,
greedy
,
shortest paths
2900
x377
1487E
Cheap Dinner
brute force
,
data structures
,
graphs
,
greedy
,
implementation
,
sortings
,
two pointers
2000
x4532
1486F
Pairs of Paths
combinatorics
,
data structures
,
dfs and similar
,
dp
,
trees
2600
x654
1486E
Paired Payment
binary search
,
brute force
,
constructive algorithms
,
dp
,
flows
,
graphs
,
shortest paths
2200
x2893
1486D
Max Median
binary search
,
data structures
,
dp
2100
x7192
1486C2
Guessing the Greatest (hard version)
binary search
,
interactive
1900
x8428
1486C1
Guessing the Greatest (easy version)
binary search
,
interactive
1600
x12122
1485F
Copy or Prefix Sum
combinatorics
,
data structures
,
dp
,
sortings
2400
x1937
1485E
Move and Swap
dfs and similar
,
dp
,
greedy
,
trees
2500
x1290
1485D
Multiples and Power Differences
constructive algorithms
,
graphs
,
math
,
number theory
2200
x5139
1485C
Floor and Mod
binary search
,
brute force
,
math
,
number theory
1700
x9907
1482H
Exam
data structures
,
string suffix structures
,
trees
3400
x476
1482G
Vabank
binary search
,
interactive
3200
x280
1482F
Useful Edges
graphs
,
shortest paths
2400
x1527
1482E
Skyline Photo
data structures
,
divide and conquer
,
dp
2100
x3162
1482D
Playlist
data structures
,
dsu
,
implementation
,
shortest paths
1900
x3840
1482C
Basic Diplomacy
brute force
,
constructive algorithms
,
greedy
,
implementation
1600
x9369
1481F
AB Tree
dp
,
greedy
,
trees
3100
x482
1481E
Sorting Books
data structures
,
dp
,
greedy
2500
x2065
1481D
AB Graph
brute force
,
constructive algorithms
,
graphs
,
greedy
,
implementation
2000
x4526
1481C
Fence Painting
brute force
,
constructive algorithms
,
greedy
1600
x11602
1479E
School Clubs
dp
,
fft
,
math
,
number theory
,
probabilities
3500
x206
1479D
Odd Mineral Resource
binary search
,
bitmasks
,
brute force
,
data structures
,
probabilities
,
trees
2900
x1013
1479C
Continuous City
bitmasks
,
constructive algorithms
2500
x1322
1479B2
Painting the Array II
constructive algorithms
,
data structures
,
dp
,
greedy
,
implementation
2100
x4036
1479B1
Painting the Array I
constructive algorithms
,
data structures
,
dp
,
greedy
,
implementation
1900
x6946
1479A
Searching Local Minimum
binary search
,
interactive
,
ternary search
1700
x11598
1478C
Nezzar and Symmetric Array
implementation
,
math
,
sortings
1700
x9745
1477F
Nezzar and Chocolate Bars
combinatorics
,
fft
,
math
,
probabilities
3500
x132
1477E
Nezzar and Tournaments
data structures
,
greedy
3300
x121
1477D
Nezzar and Hidden Permutations
constructive algorithms
,
dfs and similar
,
graphs
2800
x548
1477C
Nezzar and Nice Beatmap
constructive algorithms
,
geometry
,
greedy
,
math
,
sortings
2200
x2303
1477B
Nezzar and Binary String
data structures
,
greedy
1900
x3191
1477A
Nezzar and Board
constructive algorithms
,
math
,
number theory
1800
x5897
1476G
Minimum Difference
data structures
,
hashing
,
sortings
,
two pointers
3100
x574
1476F
Lanterns
binary search
,
data structures
,
dp
3000
x727
1476E
Pattern Matching
bitmasks
,
data structures
,
dfs and similar
,
graphs
,
hashing
,
sortings
,
strings
2300
x2338
1476D
Journey
dfs and similar
,
dp
,
dsu
,
implementation
1700
x8614
1476C
Longest Simple Cycle
dp
,
graphs
,
greedy
1600
x11343
1475G
Strange Beauty
dp
,
math
,
number theory
,
sortings
1900
x6777
1475F
Unusual Matrix
2-sat
,
brute force
,
constructive algorithms
1900
x5294
1475E
Advertising Agency
combinatorics
,
math
,
sortings
1600
x13566
1475D
Cleaning the Phone
binary search
,
dp
,
sortings
,
two pointers
1800
x10112
1474F
1 2 3 4 ...
dp
,
math
,
matrices
3000
x244
1474E
What Is It?
constructive algorithms
,
greedy
2500
x1325
1474D
Cleaning
data structures
,
dp
,
greedy
,
math
2200
x3973
1474C
Array Destruction
brute force
,
constructive algorithms
,
data structures
,
greedy
,
implementation
,
sortings
1700
x12632
1473G
Tiles
combinatorics
,
dp
,
fft
,
math
2800
x391
1473F
Strange Set
flows
,
math
2700
x952
1473E
Minimum Path
graphs
,
shortest paths
2400
x3605
1473D
Program
data structures
,
dp
,
implementation
,
strings
1700
x9604
1472G
Moving to the Capital
dfs and similar
,
dp
,
graphs
,
shortest paths
2100
x4650
1472F
New Year's Puzzle
brute force
,
dp
,
graph matchings
,
greedy
,
sortings
2100
x3052
1472E
Correct Placement
binary search
,
data structures
,
dp
,
sortings
,
two pointers
1700
x8001
1470F
Strange Covering
divide and conquer
3500
x120
1470E
Strange Permutation
binary search
,
combinatorics
,
data structures
,
dp
,
graphs
,
implementation
,
two pointers
3200
x298
1470D
Strange Housing
constructive algorithms
,
dfs and similar
,
graph matchings
,
graphs
,
greedy
2200
x3708
1470C
Strange Shuffle
binary search
,
brute force
,
constructive algorithms
,
interactive
2500
x1328
1470B
Strange Definition
bitmasks
,
graphs
,
hashing
,
math
,
number theory
1900
x6305
1469F
Power Sockets
binary search
,
data structures
,
greedy
2600
x897
1469E
A Bit Similar
bitmasks
,
brute force
,
hashing
,
string suffix structures
,
strings
,
two pointers
2400
x1958
1469D
Ceil Divisions
brute force
,
constructive algorithms
,
math
,
number theory
1700
x9411
1469C
Building a Fence
dp
,
greedy
,
implementation
,
two pointers
1600
x10729
1468M
Similar Sets
data structures
,
graphs
,
implementation
2300
x940
1468L
Prime Divisors Selection
binary search
,
greedy
,
math
,
number theory
2700
x321
1468K
The Robot
brute force
,
implementation
1600
x5084
1468J
Road Reform
dsu
,
graphs
,
greedy
1800
x4254
1468I
Plane Tiling
geometry
,
implementation
,
math
2500
x496
1468H
K and Medians
constructive algorithms
,
greedy
,
math
2200
x1786
1468G
Hobbits
binary search
,
geometry
2500
x815
1468F
Full Turn
geometry
,
hashing
,
number theory
1700
x3705
1468D
Firecrackers
binary search
,
sortings
1700
x4641
1468B
Bakery
data structures
,
dsu
2900
x212
1468A
LaIS
data structures
,
dp
,
greedy
2200
x1656
1467E
Distinctive Roots in a Tree
data structures
,
dfs and similar
,
dp
,
trees
2500
x1433
1467D
Sum of Paths
combinatorics
,
dp
,
math
2200
x3668
1467C
Three Bags
constructive algorithms
,
greedy
1900
x6380
1467B
Hills And Valleys
brute force
,
implementation
1700
x10919
1466I
The Riddle of the Sphinx
binary search
,
data structures
,
data structures
,
interactive
3400
x190
1466H
Finding satisfactory solutions
combinatorics
,
dp
,
graphs
,
greedy
,
math
3300
x272
1466G
Song of the Sirens
combinatorics
,
divide and conquer
,
hashing
,
math
,
string suffix structures
,
strings
2600
x920
1466F
Euclid's nightmare
bitmasks
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
,
sortings
2100
x2866
1466E
Apollo versus Pan
bitmasks
,
brute force
,
math
1800
x7285
1464F
My Beautiful Madness
data structures
,
trees
3500
x305
1463F
Max Correct Set
bitmasks
,
dp
,
math
3100
x582
1463E
Plan of Lectures
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
2400
x1505
1463D
Pairs
binary search
,
constructive algorithms
,
greedy
,
two pointers
1900
x4414
1463C
Busy Robot
implementation
1800
x5645
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