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Please read
the new rule regarding the restriction on the use of AI tools
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Before contest
Codeforces Round 978 (Div. 2)
6 days
→ Filter Problems
Difficulty:
—
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
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Status
Standings
Custom test
Problems
#
Name
1076A
Minimizing the String
greedy
,
strings
1200
x13119
1075B
Taxi drivers and Lyft
implementation
,
sortings
1200
x4248
1075A
The King's Race
implementation
,
math
800
x8530
1073G
Yet Another LCP Problem
data structures
,
string suffix structures
2600
x915
1073F
Choosing Two Paths
dfs and similar
,
dp
,
greedy
,
trees
2500
x544
1073E
Segment Sum
bitmasks
,
combinatorics
,
dp
,
math
2300
x2612
1073D
Berland Fair
binary search
,
brute force
,
data structures
,
greedy
1700
x6413
1073C
Vasya and Robot
binary search
,
two pointers
1800
x4779
1073B
Vasya and Books
implementation
,
math
1000
x10565
1073A
Diverse Substring
implementation
,
strings
1000
x15482
1071E
Rain Protection
binary search
,
geometry
3500
x144
1070M
Algoland and Berland
constructive algorithms
,
divide and conquer
,
geometry
3000
x68
1070L
Odd Federalization
constructive algorithms
2600
x298
1070K
Video Posts
implementation
1100
x4888
1070J
Streets and Avenues in Berhattan
dp
2300
x694
1070I
Privatization of Roads in Berland
flows
,
graph matchings
,
graphs
2400
x725
1070H
BerOS File Suggestion
brute force
,
implementation
1500
x3651
1070G
Monsters and Potions
brute force
,
dp
,
greedy
,
implementation
2300
x840
1070F
Debate
greedy
1500
x3602
1070E
Getting Deals Done
binary search
,
data structures
2100
x1384
1070D
Garbage Disposal
greedy
1300
x4903
1070C
Cloud Computing
data structures
,
greedy
2000
x2038
1070B
Berkomnadzor
data structures
,
greedy
2400
x651
1070A
Find a Number
dp
,
graphs
,
number theory
,
shortest paths
2200
x2353
1068C
Colored Rooks
constructive algorithms
,
graphs
1700
x3159
1068B
LCM
math
,
number theory
1200
x11543
1068A
Birthday
math
1400
x6813
1067E
Random Forest Rank
dp
,
graph matchings
,
math
,
trees
2800
x439
1067D
Computer Game
dp
,
greedy
,
math
,
probabilities
3100
x386
1067C
Knights
constructive algorithms
2600
x647
1067B
Multihedgehog
dfs and similar
,
graphs
,
shortest paths
1800
x2668
1067A
Array Without Local Maximums
dp
1900
x2869
1066F
Yet another 2D Walking
dp
2100
x2049
1066E
Binary Numbers AND Sum
data structures
,
implementation
,
math
1700
x6160
1066D
Boxes Packing
binary search
,
implementation
1800
x5469
1066C
Books Queries
implementation
1400
x9646
1066B
Heaters
greedy
,
two pointers
1500
x8327
1066A
Vova and Train
math
1100
x14544
1065G
Fibonacci Suffix
strings
2700
x255
1065F
Up and Down the Tree
dfs and similar
,
dp
,
trees
2500
x1176
1065E
Side Transmutations
combinatorics
,
strings
2300
x1077
1065D
Three Pieces
dfs and similar
,
dp
,
shortest paths
2200
x1309
1065C
Make It Equal
greedy
1600
x7814
1065B
Vasya and Isolated Vertices
constructive algorithms
,
graphs
1300
x10903
1065A
Vasya and Chocolate
implementation
,
math
800
x14630
1064B
Equations of Mathematical Magic
math
1200
x7532
1064A
Make a triangle!
brute force
,
geometry
,
math
800
x22456
1063F
String Journey
data structures
,
dp
,
string suffix structures
3300
x885
1063E
Lasers and Mirrors
constructive algorithms
,
math
3000
x352
1063D
Candies for Children
brute force
,
math
2600
x433
1063C
Dwarves, Hats and Extrasensory Abilities
binary search
,
constructive algorithms
,
geometry
,
interactive
1900
x3045
1063B
Labyrinth
graphs
,
shortest paths
1800
x7461
1063A
Oh Those Palindromes
constructive algorithms
,
strings
1300
x10351
1062F
Upgrading Cities
dfs and similar
,
graphs
2900
x645
1062E
Company
binary search
,
data structures
,
dfs and similar
,
greedy
,
trees
2300
x1783
1062D
Fun with Integers
dfs and similar
,
graphs
,
implementation
,
math
1800
x3952
1062C
Banh-mi
greedy
,
implementation
,
math
1600
x5417
1062B
Math
greedy
,
math
,
number theory
1500
x8742
1062A
A Prank
greedy
,
implementation
1300
x8800
1061F
Lost Root
interactive
,
probabilities
2400
x745
1061E
Politics
flows
,
graphs
2600
x531
1061D
TV Shows
data structures
,
greedy
,
implementation
,
sortings
2000
x2365
1061C
Multiplicity
data structures
,
dp
,
implementation
,
math
,
number theory
1700
x8831
1061B
Views Matter
greedy
,
implementation
,
sortings
1400
x7298
1061A
Coins
greedy
,
implementation
,
math
800
x21894
1060H
Sophisticated Device
constructive algorithms
3300
x213
1060G
Balls and Pockets
data structures
3400
x157
1060F
Shrinking Tree
combinatorics
,
dp
2900
x601
1060E
Sergey and Subway
dfs and similar
,
dp
,
trees
2000
x3142
1060D
Social Circles
greedy
,
math
1900
x3630
1060C
Maximum Subrectangle
binary search
,
implementation
,
two pointers
1600
x4889
1060B
Maximum Sum of Digits
greedy
1100
x8916
1060A
Phone Numbers
brute force
800
x14137
1059E
Split the Tree
binary search
,
data structures
,
dp
,
greedy
,
trees
2400
x1410
1059D
Nature Reserve
binary search
,
geometry
,
ternary search
2200
x2762
1059C
Sequence Transformation
constructive algorithms
,
math
1600
x7116
1059B
Forgery
implementation
1300
x7024
1059A
Cashier
implementation
1000
x12841
1057C
Tanya and Colored Candies
*special problem
,
dp
2000
x922
1057B
DDoS
*special problem
,
brute force
1400
x1831
1057A
Bmail Computer Network
*special problem
,
dfs and similar
,
trees
900
x6031
1056H
Detect Robots
data structures
,
strings
3200
x158
1056G
Take Metro
brute force
,
data structures
,
graphs
2900
x255
1056F
Write The Contest
binary search
,
dp
,
math
2500
x654
1056E
Check Transcription
brute force
,
data structures
,
hashing
,
strings
2100
x2254
1056D
Decorate Apple Tree
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
greedy
,
sortings
,
trees
1600
x5886
1056C
Pick Heroes
greedy
,
implementation
,
interactive
,
sortings
1700
x2369
1056B
Divide Candies
math
,
number theory
1600
x4214
1056A
Determine Line
implementation
800
x6634
1055G
Jellyfish Nightmare
3500
x81
1055F
Tree and XOR
strings
,
trees
2900
x476
1055E
Segments on the Line
binary search
,
dp
2500
x730
1055D
Refactoring
greedy
,
implementation
,
strings
2400
x627
1055C
Lucky Days
math
,
number theory
1900
x1913
1055B
Alice and Hairdresser
dsu
,
implementation
1300
x4997
1055A
Metro
graphs
900
x10715
1054H
Epic Convolution
chinese remainder theorem
,
fft
,
math
,
number theory
3500
x177
1054G
New Road Network
constructive algorithms
,
greedy
,
math
3300
x290
1054F
Electric Scheme
flows
,
graph matchings
2700
x314
1054E
Chips Puzzle
constructive algorithms
,
implementation
,
math
2400
x484
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