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Rayan
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Before contest
Rayan Programming Contest 2024 - Selection (Codeforces Round 989, Div. 1 + Div. 2)
4 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
Standings
Custom test
Problems
#
Name
1873C
Target Practice
implementation
,
math
800
x42084
1873B
Good Kid
brute force
,
greedy
,
math
800
x49919
1873A
Short Sort
brute force
,
implementation
800
x55596
1872D
Plus Minus Permutation
math
1200
x24688
1872C
Non-coprime Split
math
,
number theory
1100
x23668
1872B
The Corridor or There and Back Again
greedy
,
implementation
900
x28136
1872A
Two Vessels
brute force
,
greedy
,
math
800
x39507
1870B
Friendly Arrays
bitmasks
,
greedy
,
math
1200
x14325
1870A
MEXanized Array
constructive algorithms
,
greedy
,
math
800
x19144
1869B
2D Traveling
geometry
,
math
,
shortest paths
,
sortings
1100
x16529
1869A
Make It Zero
constructive algorithms
900
x22445
1867B
XOR Palindromes
bitmasks
,
constructive algorithms
,
strings
1100
x16886
1867A
green_gold_dog, array and permutation
constructive algorithms
,
sortings
800
x20062
1866A
Ambitious Kid
math
800
x23380
1864B
Swap and Reverse
constructive algorithms
,
greedy
,
sortings
,
strings
1100
x15478
1864A
Increasing and Decreasing
constructive algorithms
,
greedy
,
implementation
,
math
800
x20418
1863C
MEX Repetition
implementation
,
math
1100
x14151
1863B
Split Sort
greedy
,
math
,
sortings
1100
x15408
1863A
Channel
greedy
,
implementation
800
x17981
1862C
Flower City Fence
binary search
,
data structures
,
implementation
,
sortings
1100
x21033
1862B
Sequence Game
constructive algorithms
800
x33127
1862A
Gift Carpet
dp
,
greedy
,
implementation
,
strings
800
x32766
1861B
Two Binary Strings
constructive algorithms
,
dp
,
greedy
1000
x21602
1861A
Prime Deletion
constructive algorithms
,
math
800
x24036
1860B
Fancy Coins
binary search
,
brute force
,
greedy
,
math
1200
x17118
1860A
Not a Substring
constructive algorithms
,
strings
900
x21867
1859C
Another Permutation Problem
brute force
,
dp
,
greedy
,
math
1200
x17146
1859B
Olya and Game with Arrays
constructive algorithms
,
greedy
,
math
,
sortings
1000
x27967
1859A
United We Stand
constructive algorithms
,
math
,
number theory
800
x33583
1858C
Yet Another Permutation Problem
constructive algorithms
,
greedy
,
math
,
number theory
1000
x23306
1858A
Buttons
games
,
greedy
,
math
800
x39923
1857C
Assembly via Minimums
greedy
,
sortings
1200
x26855
1857B
Maximum Rounding
greedy
,
implementation
,
math
1100
x23211
1857A
Array Coloring
greedy
,
math
800
x49743
1856B
Good Arrays
implementation
,
math
900
x24583
1856A
Tales of a Sort
implementation
800
x26714
1855B
Longest Divisors Interval
brute force
,
combinatorics
,
greedy
,
math
,
number theory
900
x27540
1855A
Dalton the Teacher
greedy
,
math
800
x28270
1853B
Fibonaccharsis
binary search
,
brute force
,
math
1200
x17589
1853A
Desorting
brute force
,
greedy
,
math
800
x32945
1851C
Tiles Comeback
greedy
1000
x23585
1851B
Parity Sort
greedy
,
sortings
,
two pointers
800
x29570
1851A
Escalator Conversations
brute force
,
constructive algorithms
,
math
800
x29670
1850E
Cardboard for Pictures
binary search
,
geometry
,
implementation
,
math
1100
x23880
1850D
Balanced Round
brute force
,
greedy
,
implementation
,
sortings
900
x38144
1850C
Word on the Paper
implementation
,
strings
800
x45035
1850B
Ten Words of Wisdom
implementation
,
sortings
800
x43458
1850A
To My Critics
implementation
,
sortings
800
x57817
1849B
Monsters
greedy
,
math
,
sortings
1000
x26655
1849A
Morning Sandwich
implementation
,
math
800
x29884
1848B
Vika and the Bridge
binary search
,
data structures
,
greedy
,
implementation
,
math
,
sortings
1200
x15501
1848A
Vika and Her Friends
games
,
math
900
x16966
1847B
Hamon Odyssey
bitmasks
,
greedy
,
two pointers
1000
x20184
1847A
The Man who became a God
greedy
,
sortings
800
x22077
1846D
Rudolph and Christmas Tree
constructive algorithms
,
geometry
,
math
1200
x19696
1846C
Rudolf and the Another Competition
constructive algorithms
,
data structures
,
dp
,
greedy
,
sortings
1200
x19319
1846B
Rudolph and Tic-Tac-Toe
brute force
,
implementation
,
strings
800
x27027
1846A
Rudolph and Cut the Rope
implementation
,
math
800
x32633
1845B
Come Together
geometry
,
implementation
,
math
900
x21771
1845A
Forbidden Integer
constructive algorithms
,
implementation
,
math
,
number theory
800
x28375
1844B
Permutations & Primes
constructive algorithms
,
math
1000
x18350
1844A
Subtraction Game
constructive algorithms
,
games
800
x24691
1843D
Apple Tree
combinatorics
,
dfs and similar
,
dp
,
math
,
trees
1200
x18330
1843C
Sum in Binary Tree
bitmasks
,
combinatorics
,
math
,
trees
800
x33719
1843B
Long Long
greedy
,
math
,
two pointers
800
x29318
1843A
Sasha and Array Coloring
greedy
,
sortings
,
two pointers
800
x34485
1842B
Tenzing and Books
bitmasks
,
greedy
,
math
1100
x17432
1842A
Tenzing and Tsondu
games
,
math
800
x19911
1841B
Keep it Beautiful
implementation
1000
x21654
1841A
Game with Board
constructive algorithms
,
games
800
x24798
1840C
Ski Resort
combinatorics
,
math
,
two pointers
1000
x28640
1840B
Binary Cafe
bitmasks
,
combinatorics
,
math
1100
x22622
1840A
Cipher Shifer
implementation
,
strings
,
two pointers
800
x34417
1839B
Lamps
greedy
,
sortings
1100
x15251
1839A
The Good Array
greedy
,
implementation
,
math
800
x17550
1838B
Minimize Permutation Subarrays
constructive algorithms
,
math
1100
x16537
1838A
Blackboard List
constructive algorithms
,
math
800
x21629
1837C
Best Binary String
constructive algorithms
,
greedy
1000
x22235
1837B
Comparison String
greedy
900
x30712
1837A
Grasshopper on a Line
constructive algorithms
,
math
800
x33507
1836B
Astrophysicists
greedy
,
math
1100
x12714
1836A
Destroyer
implementation
,
sortings
800
x20425
1834C
Game with Reversing
games
,
greedy
,
math
,
strings
1200
x13462
1834B
Maximum Strength
greedy
,
math
1000
x15396
1834A
Unit Array
greedy
,
math
800
x25352
1833C
Vlad Building Beautiful Array
greedy
,
math
800
x26260
1833B
Restore the Weather
greedy
,
sortings
900
x26847
1833A
Musical Puzzle
implementation
,
strings
800
x32846
1832C
Contrast Value
greedy
,
implementation
1200
x21424
1832B
Maximum Sum
brute force
,
sortings
,
two pointers
1100
x22666
1832A
New Palindrome
strings
800
x25938
1831B
Array merging
constructive algorithms
,
greedy
1000
x21473
1831A
Twin Permutations
constructive algorithms
800
x27754
1829E
The Lakes
dfs and similar
,
dsu
,
graphs
,
implementation
1100
x20441
1829D
Gold Rush
brute force
,
dfs and similar
,
dp
,
implementation
1000
x26981
1829C
Mr. Perfectly Fine
bitmasks
,
greedy
,
implementation
800
x28934
1829B
Blank Space
implementation
800
x47691
1829A
Love Story
implementation
,
strings
800
x52532
1828B
Permutation Swap
math
,
number theory
900
x23835
1828A
Divisible Array
constructive algorithms
,
math
800
x23809
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