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Rayan
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Before contest
Rayan Programming Contest 2024 - Selection (Codeforces Round 989, Div. 1 + Div. 2)
3 days
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Difficulty:
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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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Custom test
Problems
#
Name
1039C
Network Safety
dfs and similar
,
dsu
,
graphs
,
math
,
sortings
2200
x1368
1039B
Subway Pursuit
binary search
,
interactive
,
probabilities
2100
x2377
1039A
Timetable
constructive algorithms
,
data structures
,
greedy
,
math
2300
x790
1038F
Wrap Around
dp
,
strings
2900
x348
1038E
Maximum Matching
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
2400
x992
1038D
Slime
dp
,
greedy
,
implementation
1800
x8424
1038C
Gambling
greedy
,
sortings
1300
x9444
1038B
Non-Coprime Partition
constructive algorithms
,
math
1100
x13662
1038A
Equality
implementation
,
strings
800
x14988
1037H
Security
data structures
,
string suffix structures
3200
x1041
1037G
A Game on Strings
games
3200
x310
1037F
Maximum Reduction
combinatorics
,
data structures
,
math
2500
x1150
1037E
Trips
graphs
2200
x2917
1037D
Valid BFS?
dfs and similar
,
graphs
,
shortest paths
,
trees
1700
x15053
1037C
Equalize
dp
,
greedy
,
strings
1300
x18957
1037B
Reach Median
greedy
1300
x10423
1037A
Packets
constructive algorithms
,
greedy
,
math
1300
x11224
1036G
Sources and Sinks
bitmasks
,
brute force
,
dfs and similar
2700
x382
1036F
Relatively Prime Powers
combinatorics
,
math
,
number theory
2400
x1619
1036E
Covered Points
fft
,
geometry
,
number theory
2400
x1660
1036D
Vasya and Arrays
greedy
,
two pointers
1600
x9363
1036C
Classy Numbers
combinatorics
,
dp
1900
x9833
1036B
Diagonal Walking v.2
math
1600
x5723
1036A
Function Height
math
1000
x10183
1034E
Little C Loves 3 III
bitmasks
,
dp
,
math
3200
x644
1034D
Intervals of Intervals
binary search
,
data structures
,
two pointers
3500
x457
1034C
Region Separation
combinatorics
,
dp
,
number theory
,
trees
2700
x888
1034B
Little C Loves 3 II
brute force
,
constructive algorithms
,
flows
,
graph matchings
2200
x2157
1034A
Enlarge GCD
number theory
1800
x8811
1033G
Chip Game
games
3500
x388
1033F
Boolean Computer
bitmasks
,
brute force
,
fft
,
math
2800
x393
1033E
Hidden Bipartite Graph
binary search
,
constructive algorithms
,
dfs and similar
,
graphs
,
interactive
2800
x657
1033D
Divisors
interactive
,
math
,
number theory
2000
x2408
1033C
Permutation Game
brute force
,
dp
,
games
1600
x5624
1033B
Square Difference
math
,
number theory
1100
x9945
1033A
King Escape
dfs and similar
,
graphs
,
implementation
1000
x13829
1032G
Chattering
2900
x466
1032F
Vasya and Maximum Matching
dp
,
trees
2400
x969
1032E
The Unbearable Lightness of Weights
dp
,
math
2100
x1695
1032D
Barcelonian Distance
geometry
,
implementation
1900
x2842
1032C
Playing Piano
constructive algorithms
,
dp
1700
x4001
1032B
Personalized Cup
1200
x5005
1032A
Kitchen Utensils
900
x6874
1031F
Familiar Operations
brute force
,
graphs
,
math
2800
x280
1031E
Triple Flips
constructive algorithms
2600
x533
1031D
Minimum path
greedy
1900
x2819
1031C
Cram Time
greedy
1600
x5330
1031B
Curiosity Has No Limits
1500
x3936
1031A
Golden Plate
implementation
,
math
800
x12922
1030G
Linear Congruential Generator
number theory
2900
x370
1030F
Putting Boxes Together
data structures
2500
x820
1030E
Vasya and Good Sequences
bitmasks
,
dp
2000
x3123
1030D
Vasya and Triangle
geometry
,
number theory
1800
x5978
1030C
Vasya and Golden Ticket
implementation
1300
x9470
1030B
Vasya and Cornfield
geometry
1100
x12403
1030A
In Search of an Easy Problem
implementation
800
x134955
1029F
Multicolored Markers
binary search
,
brute force
,
math
,
number theory
2000
x2588
1029E
Tree with Small Distances
dp
,
graphs
,
greedy
2100
x2961
1029D
Concatenated Multiples
implementation
,
math
1900
x3894
1029C
Maximal Intersection
greedy
,
math
,
sortings
1600
x7605
1029B
Creating the Contest
dp
,
greedy
,
math
1200
x17067
1029A
Many Equal Substrings
implementation
,
strings
1300
x12392
1028H
Make Square
math
2900
x496
1028G
Guess the number
dp
,
interactive
3000
x575
1028F
Make Symmetrical
brute force
2900
x525
1028E
Restore Array
constructive algorithms
2400
x1147
1028D
Order book
combinatorics
,
data structures
,
greedy
2100
x1747
1028C
Rectangles
geometry
,
implementation
,
sortings
1600
x4616
1028B
Unnatural Conditions
constructive algorithms
,
math
1200
x9133
1028A
Find Square
implementation
800
x10915
1027G
X-mouse in the Campus
bitmasks
,
math
,
number theory
2600
x310
1027F
Session in BSU
binary search
,
dfs and similar
,
dsu
,
graph matchings
,
graphs
2400
x1565
1027E
Inverse Coloring
combinatorics
,
dp
,
math
2100
x2142
1027D
Mouse Hunt
dfs and similar
,
graphs
1700
x7562
1027C
Minimum Value Rectangle
greedy
1600
x6920
1027B
Numbers on the Chessboard
implementation
,
math
1200
x8405
1027A
Palindromic Twist
implementation
,
strings
1000
x16440
1025G
Company Acquisitions
constructive algorithms
,
math
3200
x737
1025F
Disjoint Triangles
geometry
2700
x698
1025E
Colored Cubes
constructive algorithms
,
implementation
,
matrices
2700
x571
1025D
Recovering BST
brute force
,
dp
,
math
,
number theory
,
trees
2100
x3675
1025C
Plasticine zebra
constructive algorithms
,
implementation
1600
x6147
1025B
Weakened Common Divisor
brute force
,
greedy
,
number theory
1600
x7923
1025A
Doggo Recoloring
implementation
,
sortings
900
x15224
1023G
Pisces
data structures
,
flows
,
trees
3400
x129
1023F
Mobile Phone Network
dfs and similar
,
dsu
,
graphs
,
trees
2600
x889
1023E
Down or Right
constructive algorithms
,
interactive
,
matrices
2100
x2039
1023D
Array Restoration
constructive algorithms
,
data structures
1700
x4049
1023C
Bracket Subsequence
greedy
1200
x10000
1023B
Pair of Toys
math
1000
x10919
1023A
Single Wildcard Pattern Matching
brute force
,
implementation
,
strings
1200
x8724
1020B
Badge
brute force
,
dfs and similar
,
graphs
1000
x21536
1020A
New Building for SIS
math
1000
x9037
1019E
Raining season
data structures
,
divide and conquer
,
trees
3200
x340
1019D
Large Triangle
binary search
,
geometry
,
sortings
2700
x653
1019C
Sergey's problem
constructive algorithms
,
graphs
3000
x1127
1019B
The hat
binary search
,
interactive
2000
x1965
1019A
Elections
brute force
,
greedy
1700
x4654
1017H
The Films
brute force
3300
x147
1017G
The Tree
data structures
3200
x915
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