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Rayan
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Rayan Programming Contest 2024 - Selection (Codeforces Round, Div. 1 + Div. 2)
6 days
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*has extra registration
→ Filter Problems
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
281A
Word Capitalization
implementation
,
strings
800
x215773
278A
Circle Line
implementation
800
x11748
276A
Lunch Rush
implementation
900
x27823
275A
Lights Out
implementation
900
x30486
272A
Dima and Friends
implementation
,
math
1000
x24784
271A
Beautiful Year
brute force
800
x140849
270A
Fancy Fence
geometry
,
implementation
,
math
1100
x45821
268B
Buttons
implementation
,
math
1000
x32674
268A
Games
brute force
800
x87656
267A
Subtractions
math
,
number theory
900
x7583
266B
Queue at the School
constructive algorithms
,
graph matchings
,
implementation
,
shortest paths
800
x137184
266A
Stones on the Table
implementation
800
x194463
265B
Roadside Trees (Simplified Edition)
greedy
,
implementation
1000
x17265
265A
Colorful Stones (Simplified Edition)
implementation
800
x37119
264A
Escape from Stones
constructive algorithms
,
data structures
,
implementation
,
two pointers
1200
x10823
263B
Squares
greedy
,
implementation
,
sortings
900
x9010
263A
Beautiful Matrix
implementation
800
x249186
262B
Roma and Changing Signs
greedy
1200
x11440
262A
Roma and Lucky Numbers
implementation
800
x20068
259B
Little Elephant and Magic Square
brute force
,
implementation
1100
x13994
259A
Little Elephant and Chess
brute force
,
strings
1000
x9193
258A
Little Elephant and Bits
greedy
,
math
1100
x23111
257A
Sockets
greedy
,
implementation
,
sortings
1100
x6498
255B
Code Parsing
implementation
1200
x4995
255A
Greg's Workout
implementation
800
x28987
254A
Cards with Numbers
constructive algorithms
,
sortings
1200
x7110
253A
Boys and Girls
greedy
1100
x11296
252A
Little Xor
brute force
,
implementation
1100
x5330
250A
Paper Work
greedy
1000
x4146
248A
Cupboards
implementation
800
x22565
246A
Buggy Sorting
constructive algorithms
,
greedy
,
sortings
900
x9311
245B
Internet Address
implementation
,
strings
1100
x5242
245A
System Administrator
implementation
800
x8499
244A
Dividing Orange
implementation
900
x7965
242B
Big Segment
implementation
,
sortings
1100
x15852
242A
Heads or Tails
brute force
,
implementation
1100
x6393
239A
Two Bags of Potatoes
greedy
,
implementation
,
math
1200
x19036
237A
Free Cash
implementation
1000
x26970
236A
Boy or Girl
brute force
,
implementation
,
strings
800
x215330
234B
Reading
sortings
1000
x7135
234A
Lefthanders and Righthanders
implementation
1200
x4476
233A
Perfect Permutation
implementation
,
math
800
x43025
231A
Team
brute force
,
greedy
800
x333120
230A
Dragons
greedy
,
sortings
1000
x80331
228A
Is your horseshoe on the other hoof?
implementation
800
x112072
227B
Effective Approach
implementation
1100
x28313
225A
Dice Tower
constructive algorithms
,
greedy
1100
x11802
224A
Parallelepiped
brute force
,
geometry
,
math
1100
x26987
222A
Shooshuns and Sequence
brute force
,
implementation
1200
x10844
221A
Little Elephant and Function
implementation
,
math
1000
x15309
219A
k-String
implementation
,
strings
1000
x28089
218B
Airport
implementation
1100
x16586
218A
Mountain Scenery
brute force
,
constructive algorithms
,
implementation
1100
x9515
217A
Ice Skating
brute force
,
dfs and similar
,
dsu
,
graphs
1200
x21273
216A
Tiling with Hexagons
implementation
,
math
1200
x5025
215A
Bicycle Chain
brute force
,
implementation
900
x14606
214A
System of Equations
brute force
800
x35857
208D
Prizes, Prizes, more Prizes
implementation
1200
x7600
208A
Dubstep
strings
900
x89400
205A
Little Elephant and Rozdil
brute force
,
implementation
900
x22553
203A
Two Problems
brute force
,
implementation
1200
x4184
202A
LLPS
binary search
,
bitmasks
,
brute force
,
greedy
,
implementation
,
strings
800
x17019
200B
Drinks
implementation
,
math
800
x118439
199A
Hexadecimal's theorem
brute force
,
constructive algorithms
,
implementation
,
number theory
900
x26769
196A
Lexicographically Maximum Subsequence
greedy
,
strings
1100
x5412
195A
Let's Watch Football
binary search
,
brute force
,
math
1000
x9091
194B
Square
math
1200
x3553
194A
Exams
implementation
,
math
900
x9917
192B
Walking in the Rain
brute force
,
implementation
1100
x6288
190A
Vasya and the Bus
greedy
,
math
1100
x5896
188D
Asterisks
*special problem
,
implementation
1100
x682
188A
Hexagonal Numbers
*special problem
1100
x781
186B
Growing Mushrooms
greedy
,
sortings
1200
x5613
186A
Comparing Strings
implementation
,
strings
1100
x17148
182B
Vasya's Calendar
implementation
1000
x6950
181A
Series of Crimes
brute force
,
geometry
,
implementation
800
x7222
180F
Mathematical Analysis Rocks!
constructive algorithms
,
implementation
,
math
1200
x2531
178A3
Educational Game
greedy
1100
x1457
178A2
Educational Game
greedy
1000
x1641
178A1
Educational Game
1000
x1619
177D1
Encrypting Messages
brute force
1200
x2183
177B2
Rectangular Game
number theory
1200
x3033
177B1
Rectangular Game
number theory
1000
x4195
177A2
Good Matrix Elements
implementation
800
x7378
177A1
Good Matrix Elements
implementation
800
x8789
176A
Trading Business
greedy
,
sortings
1200
x1514
174A
Problem About Equation
math
1100
x2907
172B
Pseudorandom Sequence Period
*special problem
,
implementation
,
number theory
1200
x2791
172A
Phone Code
*special problem
,
brute force
,
implementation
800
x6170
171A
Mysterious numbers - 1
*special problem
,
constructive algorithms
1200
x4487
169B
Replacing Digits
greedy
1100
x3319
169A
Chores
sortings
800
x6990
168A
Wizards and Demonstration
implementation
,
math
900
x10638
166A
Rank List
binary search
,
implementation
,
sortings
1100
x17880
165A
Supercentral Point
implementation
1000
x23706
162A
Pentagonal numbers
*special problem
,
implementation
1100
x805
160B
Unlucky Ticket
greedy
,
sortings
1100
x14133
160A
Twins
greedy
,
sortings
900
x119481
159B
Matchmaker
*special problem
,
greedy
,
sortings
1100
x3809
158B
Taxi
*special problem
,
greedy
,
implementation
1100
x87939
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