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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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*has extra registration
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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
347A
Difference Row
constructive algorithms
,
implementation
,
sortings
1300
x9010
344B
Simple Molecules
brute force
,
graphs
,
math
1200
x8895
342A
Xenia and Divisors
greedy
,
implementation
1200
x12685
340A
The Wall
math
1200
x7690
332A
Down the Hatch!
implementation
1300
x3572
331C1
The Great Julya Calendar
dp
1100
x6234
330B
Road Construction
constructive algorithms
,
graphs
1300
x17235
327B
Hungry Sequence
math
1200
x19871
327A
Flipping Game
brute force
,
dp
,
implementation
1200
x42490
318B
Strings of Power
implementation
,
strings
,
two pointers
1300
x7695
316A1
Special Task
greedy
1100
x2675
315B
Sereja and Array
implementation
1200
x7039
313B
Ilya and Queries
dp
,
implementation
1100
x45105
312B
Archer
math
,
probabilities
1300
x11705
312A
Whose sentence is it?
implementation
,
strings
1100
x4993
311A
The Closest Pair
constructive algorithms
,
implementation
1300
x4037
304B
Calendar
brute force
,
implementation
1300
x2987
304A
Pythagorean Theorem II
brute force
,
math
1200
x10722
303A
Lucky Permutation Triple
constructive algorithms
,
implementation
,
math
1300
x7976
302B
Eugeny and Play List
binary search
,
implementation
,
two pointers
1200
x8249
300A
Array
brute force
,
constructive algorithms
,
implementation
1100
x23207
298B
Sail
brute force
,
greedy
,
implementation
1200
x14287
298A
Snow Footprints
greedy
,
implementation
1300
x10993
296A
Yaroslav and Permutations
greedy
,
math
1100
x23329
292B
Network Topology
graphs
,
implementation
1200
x8529
292A
SMSC
implementation
1100
x2707
291B
Command Line Arguments
*special problem
,
implementation
,
strings
1300
x3032
289A
Polo the Penguin and Segments
brute force
,
implementation
1100
x9313
288A
Polo the Penguin and Strings
greedy
1300
x6516
287A
IQ Test
brute force
,
implementation
1100
x19979
285C
Building Permutation
greedy
,
implementation
,
sortings
1200
x23425
285B
Find Marble
implementation
1200
x15078
285A
Slightly Decreasing Permutations
greedy
,
implementation
1100
x13395
276B
Little Girl and Game
games
,
greedy
1300
x28828
271B
Prime Matrix
binary search
,
brute force
,
math
,
number theory
1300
x13234
270A
Fancy Fence
geometry
,
implementation
,
math
1100
x45845
264A
Escape from Stones
constructive algorithms
,
data structures
,
implementation
,
two pointers
1200
x10826
262B
Roma and Changing Signs
greedy
1200
x11442
259B
Little Elephant and Magic Square
brute force
,
implementation
1100
x14000
258A
Little Elephant and Bits
greedy
,
math
1100
x23117
257B
Playing Cubes
games
,
greedy
,
implementation
1300
x7129
257A
Sockets
greedy
,
implementation
,
sortings
1100
x6500
255B
Code Parsing
implementation
1200
x4996
254A
Cards with Numbers
constructive algorithms
,
sortings
1200
x7113
253A
Boys and Girls
greedy
1100
x11296
252A
Little Xor
brute force
,
implementation
1100
x5331
251A
Points on Line
binary search
,
combinatorics
,
two pointers
1300
x17908
246B
Increase and Decrease
greedy
,
math
1300
x11368
245B
Internet Address
implementation
,
strings
1100
x5243
242B
Big Segment
implementation
,
sortings
1100
x15859
242A
Heads or Tails
brute force
,
implementation
1100
x6393
241A
Old Peykan
greedy
1300
x2244
239A
Two Bags of Potatoes
greedy
,
implementation
,
math
1200
x19045
238A
Not Wool Sequences
constructive algorithms
,
math
1300
x2049
236B
Easy Number Challenge
implementation
,
number theory
1300
x14442
234C
Weather
dp
,
implementation
1300
x5569
234A
Lefthanders and Righthanders
implementation
1200
x4478
230B
T-primes
binary search
,
implementation
,
math
,
number theory
1300
x76813
227B
Effective Approach
implementation
1100
x28336
227A
Where do I Turn?
geometry
1300
x4227
225A
Dice Tower
constructive algorithms
,
greedy
1100
x11808
224A
Parallelepiped
brute force
,
geometry
,
math
1100
x27000
222B
Cosmic Tables
data structures
,
implementation
1300
x6138
222A
Shooshuns and Sequence
brute force
,
implementation
1200
x10844
221B
Little Elephant and Numbers
implementation
1300
x4589
220A
Little Elephant and Problem
implementation
,
sortings
1300
x12024
218B
Airport
implementation
1100
x16592
218A
Mountain Scenery
brute force
,
constructive algorithms
,
implementation
1100
x9519
217A
Ice Skating
brute force
,
dfs and similar
,
dsu
,
graphs
1200
x21280
216A
Tiling with Hexagons
implementation
,
math
1200
x5025
215B
Olympic Medal
greedy
,
math
1300
x5606
208D
Prizes, Prizes, more Prizes
implementation
1200
x7601
203B
Game on Paper
brute force
,
implementation
1300
x2613
203A
Two Problems
brute force
,
implementation
1200
x4185
196A
Lexicographically Maximum Subsequence
greedy
,
strings
1100
x5412
195B
After Training
data structures
,
implementation
,
math
1300
x5211
194B
Square
math
1200
x3554
192B
Walking in the Rain
brute force
,
implementation
1100
x6292
192A
Funky Numbers
binary search
,
brute force
,
implementation
1300
x10450
190A
Vasya and the Bus
greedy
,
math
1100
x5896
189B
Counting Rhombi
brute force
,
math
1300
x3956
189A
Cut Ribbon
brute force
,
dp
1300
x67840
188D
Asterisks
*special problem
,
implementation
1100
x682
188B
A + Reverse B
*special problem
,
implementation
1300
x736
188A
Hexagonal Numbers
*special problem
1100
x781
186B
Growing Mushrooms
greedy
,
sortings
1200
x5616
186A
Comparing Strings
implementation
,
strings
1100
x17150
185A
Plant
math
1300
x5952
181B
Number of Triplets
binary search
,
brute force
1300
x3049
180F
Mathematical Analysis Rocks!
constructive algorithms
,
implementation
,
math
1200
x2531
178A3
Educational Game
greedy
1100
x1457
177D1
Encrypting Messages
brute force
1200
x2184
177B2
Rectangular Game
number theory
1200
x3035
176A
Trading Business
greedy
,
sortings
1200
x1514
174A
Problem About Equation
math
1100
x2907
173A
Rock-Paper-Scissors
implementation
,
math
1300
x2303
172B
Pseudorandom Sequence Period
*special problem
,
implementation
,
number theory
1200
x2792
171D
Broken checker
*special problem
,
brute force
1300
x2580
171B
Star
*special problem
,
combinatorics
1300
x4074
171A
Mysterious numbers - 1
*special problem
,
constructive algorithms
1200
x4487
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