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Rayan
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Rayan Programming Contest 2024 - Selection (Codeforces Round 989, Div. 1 + Div. 2)
3 days
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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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Problems
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Status
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Custom test
Problems
#
Name
138B
Digits Permutations
greedy
1900
x1039
138A
Literature Lesson
implementation
1600
x2395
137E
Last Chance
data structures
,
implementation
,
strings
2000
x1243
137D
Palindromes
dp
,
strings
1900
x1524
135E
Weak Subsequence
combinatorics
3000
x306
135D
Cycle
brute force
,
dfs and similar
,
implementation
2500
x301
135C
Zero-One
constructive algorithms
,
games
,
greedy
1900
x1349
135B
Rectangle and Square
brute force
,
geometry
,
math
1600
x2364
134C
Swaps
constructive algorithms
,
graphs
,
greedy
2200
x475
134B
Pairs of Numbers
brute force
,
dfs and similar
,
math
,
number theory
1900
x2052
132E
Bits of merry old England
flows
,
graphs
2700
x533
132D
Constants in the language of Shakespeare
constructive algorithms
,
dp
,
greedy
2100
x618
132C
Logo Turtle
dp
1800
x2355
132B
Piet
implementation
2100
x663
131F
Present to Mom
binary search
,
two pointers
2000
x649
131E
Yet Another Task with Queens
sortings
1700
x1856
131D
Subway
dfs and similar
,
graphs
1600
x4701
130J
Date calculation
*special problem
1800
x341
130I
Array sorting
*special problem
,
sortings
2300
x167
130H
Balanced brackets
*special problem
1600
x607
130G
CAPS LOCK ON
*special problem
1700
x284
130F
Prime factorization
*special problem
1600
x278
130E
Tribonacci numbers
*special problem
1600
x296
128E
Birthday
geometry
,
math
2900
x99
128D
Numbers
constructive algorithms
,
implementation
2000
x1147
128C
Games with Rectangle
combinatorics
,
dp
2000
x2971
128B
String
brute force
,
constructive algorithms
,
hashing
,
implementation
,
string suffix structures
,
strings
2100
x2603
126E
Pills
brute force
,
flows
2900
x83
126D
Fibonacci Sums
dp
,
math
2300
x839
126C
E-reader Display
constructive algorithms
,
greedy
2000
x724
126B
Password
binary search
,
dp
,
hashing
,
string suffix structures
,
strings
1700
x19746
126A
Hot Bath
binary search
,
brute force
,
math
1900
x1437
125E
MST Company
binary search
,
graphs
2400
x1095
125D
Two progressions
constructive algorithms
,
greedy
2200
x416
125C
Hobbits' Party
constructive algorithms
,
greedy
1600
x932
123E
Maze
dfs and similar
,
dp
,
probabilities
,
trees
2500
x725
123D
String
string suffix structures
2300
x1232
123C
Brackets
combinatorics
,
dp
,
greedy
2300
x617
123B
Squares
math
1800
x1134
121E
Lucky Array
data structures
2400
x1740
121D
Lucky Segments
binary search
,
implementation
,
two pointers
2500
x277
121C
Lucky Permutation
brute force
,
combinatorics
,
number theory
1900
x1288
120J
Minimum Sum
divide and conquer
,
geometry
,
sortings
1900
x939
120I
Luck is in Numbers
greedy
2200
x304
120H
Brevity is Soul of Wit
graph matchings
1800
x1415
120G
Boom
implementation
1800
x690
119E
Alternative Reality
geometry
2400
x96
119D
String Transformation
hashing
,
strings
2500
x501
119C
Education Reform
dp
2000
x947
119B
Before Exam
constructive algorithms
,
implementation
,
sortings
1900
x1079
118E
Bertown roads
dfs and similar
,
graphs
2000
x6762
118D
Caesar's Legions
dp
1700
x17616
118C
Fancy Number
brute force
,
greedy
,
sortings
,
strings
1900
x2603
117E
Tree or not Tree
data structures
,
divide and conquer
,
implementation
,
trees
2900
x349
117D
Not Quick Transformation
divide and conquer
,
math
2500
x340
117C
Cycle
dfs and similar
,
graphs
2000
x2653
117B
Very Interesting Game
brute force
,
number theory
1800
x1614
115E
Linear Kingdom Races
data structures
,
dp
2400
x1632
115D
Unambiguous Arithmetic Expression
dp
,
expression parsing
2600
x400
115C
Plumber
math
2200
x600
113E
Sleeping
combinatorics
,
implementation
,
math
2700
x119
113D
Museum
math
,
matrices
,
probabilities
2700
x686
113C
Double Happiness
brute force
,
math
,
number theory
2200
x1243
113B
Petr#
brute force
,
data structures
,
hashing
,
strings
2000
x2836
113A
Grammar Lessons
implementation
,
strings
1600
x2305
111E
Petya and Rectangle
2900
x66
111D
Petya and Coloring
combinatorics
,
dp
2300
x776
111C
Petya and Spiders
bitmasks
,
dp
,
dsu
2100
x1393
111B
Petya and Divisors
binary search
,
data structures
,
number theory
1900
x3697
109E
Lucky Interval
brute force
,
math
2700
x102
109D
Lucky Sorting
constructive algorithms
,
sortings
2000
x814
109C
Lucky Tree
dp
,
dsu
,
trees
1900
x3626
109B
Lucky Probability
brute force
,
probabilities
1900
x1556
107E
Darts
geometry
,
probabilities
2700
x138
107D
Crime Management
dp
,
graphs
,
matrices
2400
x428
107C
Arrangement
bitmasks
,
dp
2400
x390
107B
Basketball Team
combinatorics
,
dp
,
math
,
probabilities
1600
x3522
106E
Space Rescuers
geometry
,
ternary search
2100
x874
106D
Treasure Island
brute force
,
implementation
1700
x1366
106C
Buns
dp
1700
x6042
105E
Lift and Throw
brute force
2500
x192
105D
Entertaining Geodetics
brute force
,
dsu
,
implementation
2700
x139
105C
Item World
brute force
,
implementation
,
sortings
2200
x344
105B
Dark Assembly
brute force
,
probabilities
1800
x820
105A
Transmigration
implementation
1700
x1844
103E
Buying Sets
flows
,
graph matchings
2900
x883
103D
Time to Raid Cowavans
brute force
,
data structures
,
sortings
2100
x2131
103C
Russian Roulette
constructive algorithms
,
greedy
1900
x961
101E
Candies and Stones
divide and conquer
,
dp
2500
x517
101D
Castle
dp
,
greedy
,
probabilities
,
sortings
,
trees
2300
x693
101C
Vectors
implementation
,
math
2000
x703
101B
Buses
binary search
,
data structures
,
dp
1700
x2640
100J
Interval Coloring
*special problem
,
greedy
,
math
2400
x63
100H
Battleship
*special problem
,
dfs and similar
,
implementation
2100
x80
100G
Name the album
*special problem
,
data structures
,
implementation
1800
x125
100F
Polynom
*special problem
,
implementation
1800
x136
100E
Lamps in a Line
*special problem
,
math
1600
x274
98E
Help Shrek and Donkey
dp
,
games
,
math
,
probabilities
2700
x479
98D
Help Monks
constructive algorithms
2500
x185
98C
Help Greg the Dwarf
geometry
,
ternary search
2500
x310
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