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Before contest
Codeforces Round 988 (Div. 3)
21:02:02
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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
1073E
Segment Sum
bitmasks
,
combinatorics
,
dp
,
math
2300
x2651
1073D
Berland Fair
binary search
,
brute force
,
data structures
,
greedy
1700
x6434
1073C
Vasya and Robot
binary search
,
two pointers
1800
x4807
1073B
Vasya and Books
implementation
,
math
1000
x10600
1073A
Diverse Substring
implementation
,
strings
1000
x15600
1071E
Rain Protection
binary search
,
geometry
3500
x146
1070M
Algoland and Berland
constructive algorithms
,
divide and conquer
,
geometry
3000
x69
1070L
Odd Federalization
constructive algorithms
2600
x302
1070K
Video Posts
implementation
1100
x4955
1070J
Streets and Avenues in Berhattan
dp
2300
x700
1070I
Privatization of Roads in Berland
flows
,
graph matchings
,
graphs
2400
x726
1070H
BerOS File Suggestion
brute force
,
implementation
1500
x3666
1070G
Monsters and Potions
brute force
,
dp
,
greedy
,
implementation
2300
x843
1070F
Debate
greedy
1500
x3658
1070E
Getting Deals Done
binary search
,
data structures
2100
x1388
1070D
Garbage Disposal
greedy
1300
x4924
1070C
Cloud Computing
data structures
,
greedy
2000
x2061
1070B
Berkomnadzor
data structures
,
greedy
2400
x652
1070A
Find a Number
dp
,
graphs
,
number theory
,
shortest paths
2200
x2370
1068C
Colored Rooks
constructive algorithms
,
graphs
1700
x3163
1068B
LCM
math
,
number theory
1200
x11681
1068A
Birthday
math
1400
x6851
1067E
Random Forest Rank
dp
,
graph matchings
,
math
,
trees
2800
x454
1067D
Computer Game
dp
,
greedy
,
math
,
probabilities
3100
x406
1067C
Knights
constructive algorithms
2600
x657
1067B
Multihedgehog
dfs and similar
,
graphs
,
shortest paths
1800
x2710
1067A
Array Without Local Maximums
dp
1900
x2892
1066F
Yet another 2D Walking
dp
2100
x2072
1066E
Binary Numbers AND Sum
data structures
,
implementation
,
math
1700
x6188
1066D
Boxes Packing
binary search
,
implementation
1800
x5504
1066C
Books Queries
implementation
1400
x9708
1066B
Heaters
greedy
,
two pointers
1500
x8372
1066A
Vova and Train
math
1100
x14604
1065G
Fibonacci Suffix
strings
2700
x256
1065F
Up and Down the Tree
dfs and similar
,
dp
,
trees
2500
x1189
1065E
Side Transmutations
combinatorics
,
strings
2300
x1081
1065D
Three Pieces
dfs and similar
,
dp
,
shortest paths
2200
x1324
1065C
Make It Equal
greedy
1600
x7856
1065B
Vasya and Isolated Vertices
constructive algorithms
,
graphs
1300
x10956
1065A
Vasya and Chocolate
implementation
,
math
800
x14689
1064B
Equations of Mathematical Magic
math
1200
x7557
1064A
Make a triangle!
brute force
,
geometry
,
math
800
x22618
1063F
String Journey
data structures
,
dp
,
string suffix structures
3300
x888
1063E
Lasers and Mirrors
constructive algorithms
,
math
3000
x356
1063D
Candies for Children
brute force
,
math
2600
x435
1063C
Dwarves, Hats and Extrasensory Abilities
binary search
,
constructive algorithms
,
geometry
,
interactive
1900
x3069
1063B
Labyrinth
graphs
,
shortest paths
1800
x7583
1063A
Oh Those Palindromes
constructive algorithms
,
strings
1300
x10386
1062F
Upgrading Cities
dfs and similar
,
graphs
2900
x652
1062E
Company
binary search
,
data structures
,
dfs and similar
,
greedy
,
trees
2300
x1799
1062D
Fun with Integers
dfs and similar
,
graphs
,
implementation
,
math
1800
x3966
1062C
Banh-mi
greedy
,
implementation
,
math
1600
x5468
1062B
Math
greedy
,
math
,
number theory
1500
x8860
1062A
A Prank
greedy
,
implementation
1300
x8829
1061F
Lost Root
interactive
,
probabilities
2400
x754
1061E
Politics
flows
,
graphs
2600
x535
1061D
TV Shows
data structures
,
greedy
,
implementation
,
sortings
2000
x2375
1061C
Multiplicity
data structures
,
dp
,
implementation
,
math
,
number theory
1700
x9004
1061B
Views Matter
greedy
,
implementation
,
sortings
1400
x7315
1061A
Coins
greedy
,
implementation
,
math
800
x22073
1060H
Sophisticated Device
constructive algorithms
3300
x213
1060G
Balls and Pockets
data structures
3400
x159
1060F
Shrinking Tree
combinatorics
,
dp
2900
x604
1060E
Sergey and Subway
dfs and similar
,
dp
,
trees
2000
x3180
1060D
Social Circles
greedy
,
math
1900
x3640
1060C
Maximum Subrectangle
binary search
,
implementation
,
two pointers
1600
x4906
1060B
Maximum Sum of Digits
greedy
1100
x8981
1060A
Phone Numbers
brute force
800
x14253
1059E
Split the Tree
binary search
,
data structures
,
dp
,
greedy
,
trees
2400
x1447
1059D
Nature Reserve
binary search
,
geometry
,
ternary search
2200
x2777
1059C
Sequence Transformation
constructive algorithms
,
math
1600
x7169
1059B
Forgery
implementation
1300
x7093
1059A
Cashier
implementation
1000
x12891
1057C
Tanya and Colored Candies
*special problem
,
dp
2000
x939
1057B
DDoS
*special problem
,
brute force
1400
x1838
1057A
Bmail Computer Network
*special problem
,
dfs and similar
,
trees
900
x6175
1056H
Detect Robots
data structures
,
strings
3200
x159
1056G
Take Metro
brute force
,
data structures
,
graphs
2900
x257
1056F
Write The Contest
binary search
,
dp
,
math
2500
x663
1056E
Check Transcription
brute force
,
data structures
,
hashing
,
strings
2100
x2281
1056D
Decorate Apple Tree
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
greedy
,
sortings
,
trees
1600
x5944
1056C
Pick Heroes
greedy
,
implementation
,
interactive
,
sortings
1700
x2383
1056B
Divide Candies
math
,
number theory
1600
x4230
1056A
Determine Line
implementation
800
x6677
1055G
Jellyfish Nightmare
3500
x82
1055F
Tree and XOR
strings
,
trees
2900
x479
1055E
Segments on the Line
binary search
,
dp
2500
x734
1055D
Refactoring
greedy
,
implementation
,
strings
2400
x628
1055C
Lucky Days
math
,
number theory
1900
x1917
1055B
Alice and Hairdresser
dsu
,
implementation
1300
x5018
1055A
Metro
graphs
900
x10771
1054H
Epic Convolution
chinese remainder theorem
,
fft
,
math
,
number theory
3500
x179
1054G
New Road Network
constructive algorithms
,
greedy
,
math
3300
x296
1054F
Electric Scheme
flows
,
graph matchings
2700
x316
1054E
Chips Puzzle
constructive algorithms
,
implementation
,
math
2400
x487
1054D
Changing Array
greedy
,
implementation
1900
x2254
1054C
Candies Distribution
constructive algorithms
,
implementation
1500
x4292
1054B
Appending Mex
implementation
1000
x6608
1054A
Elevator or Stairs?
implementation
800
x9102
1053E
Euler tour
constructive algorithms
,
trees
3500
x203
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