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Due to scheduled maintenance, Codeforces may be unavailable starting from
October 8, 20:00 (UTC)
for a duration of 30 to 120 minutes.
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Codeforces Round 978 (Div. 2)
5 days
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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
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sortings
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strings
ternary search
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Custom test
Problems
#
Name
1032D
Barcelonian Distance
geometry
,
implementation
1900
x2813
1032C
Playing Piano
constructive algorithms
,
dp
1700
x3964
1032B
Personalized Cup
1200
x4995
1032A
Kitchen Utensils
900
x6857
1031F
Familiar Operations
brute force
,
graphs
,
math
2800
x277
1031E
Triple Flips
constructive algorithms
2600
x530
1031D
Minimum path
greedy
1900
x2804
1031C
Cram Time
greedy
1600
x5321
1031B
Curiosity Has No Limits
1500
x3911
1031A
Golden Plate
implementation
,
math
800
x12854
1030G
Linear Congruential Generator
number theory
2900
x359
1030F
Putting Boxes Together
data structures
2500
x808
1030E
Vasya and Good Sequences
bitmasks
,
dp
2000
x3093
1030D
Vasya and Triangle
geometry
,
number theory
1800
x5944
1030C
Vasya and Golden Ticket
implementation
1300
x9437
1030B
Vasya and Cornfield
geometry
1100
x12328
1030A
In Search of an Easy Problem
implementation
800
x130316
1029F
Multicolored Markers
binary search
,
brute force
,
math
,
number theory
2000
x2574
1029E
Tree with Small Distances
dp
,
graphs
,
greedy
2100
x2928
1029D
Concatenated Multiples
implementation
,
math
1900
x3872
1029C
Maximal Intersection
greedy
,
math
,
sortings
1600
x7547
1029B
Creating the Contest
dp
,
greedy
,
math
1200
x16891
1029A
Many Equal Substrings
implementation
,
strings
1300
x12309
1028H
Make Square
math
2900
x487
1028G
Guess the number
dp
,
interactive
3000
x555
1028F
Make Symmetrical
brute force
2900
x524
1028E
Restore Array
constructive algorithms
2400
x1141
1028D
Order book
combinatorics
,
data structures
,
greedy
2100
x1743
1028C
Rectangles
geometry
,
implementation
,
sortings
1600
x4582
1028B
Unnatural Conditions
constructive algorithms
,
math
1200
x9059
1028A
Find Square
implementation
800
x10796
1027G
X-mouse in the Campus
bitmasks
,
math
,
number theory
2600
x307
1027F
Session in BSU
binary search
,
dfs and similar
,
dsu
,
graph matchings
,
graphs
2400
x1547
1027E
Inverse Coloring
combinatorics
,
dp
,
math
2100
x2131
1027D
Mouse Hunt
dfs and similar
,
graphs
1700
x7449
1027C
Minimum Value Rectangle
greedy
1600
x6842
1027B
Numbers on the Chessboard
implementation
,
math
1200
x8354
1027A
Palindromic Twist
implementation
,
strings
1000
x16288
1025G
Company Acquisitions
constructive algorithms
,
math
3200
x730
1025F
Disjoint Triangles
geometry
2700
x655
1025E
Colored Cubes
constructive algorithms
,
implementation
,
matrices
2700
x568
1025D
Recovering BST
brute force
,
dp
,
math
,
number theory
,
trees
2100
x3647
1025C
Plasticine zebra
constructive algorithms
,
implementation
1600
x6125
1025B
Weakened Common Divisor
brute force
,
greedy
,
number theory
1600
x7884
1025A
Doggo Recoloring
implementation
,
sortings
900
x15126
1023G
Pisces
data structures
,
flows
,
trees
3400
x126
1023F
Mobile Phone Network
dfs and similar
,
dsu
,
graphs
,
trees
2600
x882
1023E
Down or Right
constructive algorithms
,
interactive
,
matrices
2100
x2031
1023D
Array Restoration
constructive algorithms
,
data structures
1700
x4035
1023C
Bracket Subsequence
greedy
1200
x9900
1023B
Pair of Toys
math
1000
x10832
1023A
Single Wildcard Pattern Matching
brute force
,
implementation
,
strings
1200
x8679
1020B
Badge
brute force
,
dfs and similar
,
graphs
1000
x21120
1020A
New Building for SIS
math
1000
x8991
1019E
Raining season
data structures
,
divide and conquer
,
trees
3200
x336
1019D
Large Triangle
binary search
,
geometry
,
sortings
2700
x639
1019C
Sergey's problem
constructive algorithms
,
graphs
3000
x1110
1019B
The hat
binary search
,
interactive
2000
x1949
1019A
Elections
brute force
,
greedy
1700
x4635
1017H
The Films
brute force
3300
x147
1017G
The Tree
data structures
3200
x893
1017F
The Neutral Zone
brute force
,
math
2500
x816
1017E
The Supersonic Rocket
geometry
,
hashing
,
strings
2400
x1026
1017D
The Wu
bitmasks
,
brute force
,
data structures
1900
x3499
1017C
The Phone Number
constructive algorithms
,
greedy
1600
x6008
1017B
The Bits
implementation
,
math
1200
x9138
1017A
The Rank
implementation
800
x20420
1016G
Appropriate Team
bitmasks
,
math
,
number theory
2700
x265
1016F
Road Projects
dfs and similar
,
dp
,
trees
2600
x813
1016E
Rest In The Shades
binary search
,
geometry
2400
x1156
1016D
Vasya And The Matrix
constructive algorithms
,
flows
,
math
1800
x4693
1016C
Vasya And The Mushrooms
dp
,
implementation
1800
x3709
1016B
Segment Occurrences
brute force
,
implementation
1300
x9461
1016A
Death Note
greedy
,
implementation
,
math
900
x14904
1015F
Bracket Substring
dp
,
strings
2300
x1115
1015E2
Stars Drawing (Hard Edition)
binary search
,
dp
,
greedy
1900
x3601
1015E1
Stars Drawing (Easy Edition)
brute force
,
dp
,
greedy
1700
x5782
1015D
Walking Between Houses
constructive algorithms
,
greedy
1600
x8200
1015C
Songs Compression
sortings
1100
x17989
1015B
Obtaining the String
implementation
1200
x11579
1015A
Points in Segments
implementation
800
x20936
1013B
And
greedy
1200
x7644
1013A
Piles With Stones
math
800
x10953
1012F
Passports
dp
,
implementation
3400
x158
1012E
Cycle sort
dsu
,
math
3100
x324
1012D
AB-Strings
constructive algorithms
,
strings
2800
x371
1012C
Hills
dp
1900
x3489
1012B
Chemical table
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
matrices
1900
x3955
1012A
Photo of The Sky
brute force
,
implementation
,
math
,
sortings
1500
x6427
1011B
Planning The Expedition
binary search
,
brute force
,
implementation
1200
x10095
1011A
Stages
greedy
,
implementation
,
sortings
900
x12180
1010F
Tree
fft
,
graphs
,
trees
3400
x218
1010E
Store
data structures
2700
x335
1010D
Mars rover
dfs and similar
,
graphs
,
implementation
,
trees
2000
x2379
1010C
Border
number theory
1800
x4845
1010B
Rocket
binary search
,
interactive
1800
x5188
1010A
Fly
binary search
,
math
1500
x8061
1009G
Allowed Letters
bitmasks
,
flows
,
graph matchings
,
graphs
,
greedy
2400
x824
1009F
Dominant Indices
data structures
,
dsu
,
trees
2300
x5632
1009E
Intercity Travelling
combinatorics
,
math
,
probabilities
2000
x2976
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