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Rayan
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Rayan Programming Contest 2024 - Selection (Codeforces Round 989, Div. 1 + Div. 2)
4 days
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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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Problems
#
Name
2041E
Beautiful Array
constructive algorithms
1200
x1863
2041B
Bowling Frame
binary search
,
brute force
,
math
1200
x1810
2039C1
Shohag Loves XOR (Easy Version)
bitmasks
,
brute force
,
math
,
number theory
1200
x7385
2039B
Shohag Loves Strings
constructive algorithms
,
greedy
,
implementation
,
strings
1000
x9275
2039A
Shohag Loves Mod
constructive algorithms
,
number theory
800
x11532
2038N
Fixing the Expression
implementation
800
x6368
2038J
Waiting for...
greedy
,
implementation
800
x4815
2037C
Superultra's Favorite Permutation
constructive algorithms
,
greedy
,
math
,
number theory
1000
x15474
2037B
Intercepted Inputs
brute force
,
implementation
800
x17849
2037A
Twice
implementation
800
x23118
2036C
Anya and 1100
brute force
,
implementation
1100
x16376
2036B
Startup
greedy
,
sortings
800
x22972
2036A
Quintomania
implementation
800
x30486
2035B
Everyone Loves Tres
constructive algorithms
,
greedy
,
math
,
number theory
900
x14705
2035A
Sliding
implementation
,
math
800
x14850
2033B
Sakurako and Water
brute force
,
constructive algorithms
,
greedy
900
x22961
2033A
Sakurako and Kosuke
constructive algorithms
,
implementation
,
math
800
x32894
2032B
Medians
constructive algorithms
,
greedy
,
implementation
,
math
1100
x15559
2032A
Circuit
greedy
,
implementation
,
math
,
number theory
800
x20298
2031B
Penchick and Satay Sticks
brute force
,
greedy
,
sortings
900
x13689
2031A
Penchick and Modern Monument
constructive algorithms
,
dp
,
greedy
,
math
800
x14884
2030C
A TRUE Battle
brute force
,
games
,
greedy
1100
x15767
2030B
Minimise Oneness
combinatorics
,
constructive algorithms
,
games
,
math
800
x20062
2030A
A Gift From Orangutan
constructive algorithms
,
greedy
,
math
,
sortings
800
x23456
2029B
Replacement
constructive algorithms
,
games
,
strings
1100
x8268
2029A
Set
greedy
,
math
800
x10979
2028A
Alice's Adventures in ''Chess''
brute force
,
implementation
,
math
900
x13871
2027B
Stalin Sort
brute force
,
greedy
1100
x13622
2027A
Rectangle Arrangement
geometry
,
implementation
,
math
800
x18571
2026A
Perpendicular Segments
constructive algorithms
,
geometry
,
greedy
,
math
900
x15927
2025B
Binomial Coefficients, Kind Of
combinatorics
,
dp
,
math
1100
x16424
2025A
Two Screens
binary search
,
greedy
,
strings
,
two pointers
800
x23482
2024B
Buying Lemonade
binary search
,
constructive algorithms
,
sortings
1100
x13137
2024A
Profitable Interest Rate
greedy
,
math
800
x18850
2022A
Bus to Pénjamo
constructive algorithms
,
greedy
,
implementation
,
math
800
x13758
2021B
Maximize Mex
brute force
,
greedy
,
math
,
number theory
1200
x14313
2021A
Meaning Mean
data structures
,
greedy
,
math
,
sortings
800
x18573
2020B
Brightness Begins
binary search
,
math
1200
x16400
2020A
Find Minimum Operations
bitmasks
,
brute force
,
greedy
,
math
,
number theory
800
x21882
2019B
All Pairs Segments
implementation
,
math
1200
x13851
2019A
Max Plus Size
brute force
,
dp
,
greedy
800
x22850
2014C
Robin Hood in Town
binary search
,
greedy
,
math
1100
x21579
2014B
Robin Hood and the Major Oak
math
800
x28282
2014A
Robin Helps
greedy
,
implementation
800
x37043
2013B
Battle for Survive
constructive algorithms
,
greedy
,
math
900
x22982
2013A
Zhan's Blender
constructive algorithms
,
math
800
x27113
2010B
Three Brothers
brute force
,
implementation
,
math
800
x19914
2010A
Alternating Sum of Numbers
brute force
,
implementation
,
math
800
x16828
2009C
The Legend of Freya the Frog
implementation
,
math
1100
x25957
2009B
osu!mania
brute force
,
implementation
800
x41907
2009A
Minimize!
brute force
,
math
800
x51658
2008D
Sakurako's Hobby
dp
,
dsu
,
graphs
,
math
1100
x19160
2008C
Longest Good Array
binary search
,
brute force
,
math
800
x30371
2008B
Square or Not
brute force
,
math
,
strings
800
x28531
2008A
Sakurako's Exam
brute force
,
constructive algorithms
,
greedy
,
math
800
x35224
2007B
Index and Maximum Value
data structures
,
greedy
900
x21220
2007A
Dora's Set
greedy
,
math
,
number theory
800
x22666
2005B2
The Strict Teacher (Hard Version)
binary search
,
greedy
,
math
,
sortings
1200
x17290
2005B1
The Strict Teacher (Easy Version)
greedy
,
math
,
sortings
1000
x19999
2005A
Simple Palindrome
combinatorics
,
constructive algorithms
,
greedy
,
math
900
x21686
2004C
Splitting Items
games
,
greedy
,
sortings
1100
x23333
2004B
Game with Doors
brute force
,
greedy
1000
x26107
2004A
Closest Point
implementation
,
math
800
x30303
2003C
Turtle and Good Pairs
constructive algorithms
,
greedy
,
sortings
,
strings
1200
x18153
2003B
Turtle and Piggy Are Playing a Game 2
games
,
greedy
,
sortings
800
x25136
2003A
Turtle and Good Strings
greedy
,
strings
800
x28975
2002C
Black Circles
brute force
,
geometry
,
greedy
,
math
1200
x15085
2002B
Removals Game
constructive algorithms
,
games
1000
x18892
2002A
Distanced Coloring
constructive algorithms
,
implementation
,
math
800
x19470
2001B
Generate Permutation
constructive algorithms
800
x24029
2001A
Make All Equal
greedy
,
implementation
800
x29576
2000D
Right Left Wrong
greedy
,
implementation
,
two pointers
1200
x23089
2000C
Numeric String Template
data structures
,
strings
1000
x25467
2000B
Seating in a Bus
two pointers
800
x33843
2000A
Primary Task
implementation
,
math
,
strings
800
x37402
1999D
Slavic's Exam
greedy
,
implementation
,
strings
1100
x27052
1999C
Showering
greedy
,
implementation
800
x35153
1999B
Card Game
brute force
,
constructive algorithms
,
implementation
1000
x32528
1999A
A+B Again?
implementation
,
math
800
x56367
1998B
Minimize Equal Sum Subarrays
constructive algorithms
,
math
,
number theory
1000
x23857
1998A
Find K Distinct Points with Fixed Center
constructive algorithms
,
implementation
,
math
800
x23974
1997C
Even Positions
constructive algorithms
,
data structures
,
greedy
1100
x22051
1997B
Make Three Regions
constructive algorithms
,
two pointers
1100
x20671
1997A
Strong Password
brute force
,
implementation
,
strings
800
x29285
1996C
Sort
dp
,
greedy
,
sortings
,
strings
1200
x22989
1996B
Scale
greedy
,
implementation
800
x32638
1996A
Legs
binary search
,
math
,
ternary search
800
x43408
1995B1
Bouquet (Easy Version)
binary search
,
brute force
,
greedy
,
sortings
,
two pointers
1100
x18035
1995A
Diagonals
brute force
,
greedy
,
implementation
,
math
800
x24272
1994B
Fun Game
bitmasks
,
constructive algorithms
,
greedy
,
math
1100
x16594
1994A
Diverse Game
constructive algorithms
,
greedy
,
implementation
800
x20284
1993B
Parity and Sum
constructive algorithms
,
greedy
1100
x22815
1993A
Question Marks
greedy
,
implementation
800
x29476
1992D
Test of Love
dp
,
greedy
,
implementation
1200
x20479
1992C
Gorilla and Permutation
constructive algorithms
,
math
900
x29194
1992B
Angry Monk
greedy
,
math
,
sortings
800
x34354
1992A
Only Pluses
brute force
,
constructive algorithms
,
greedy
,
math
,
sortings
800
x41464
1991B
AND Reconstruction
bitmasks
,
constructive algorithms
,
greedy
1100
x16417
1991A
Maximize the Last Element
greedy
,
implementation
800
x21899
1990B
Array Craft
constructive algorithms
,
greedy
1200
x16574
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