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Rayan
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Before contest
Rayan Programming Contest 2024 - Selection (Codeforces Round, Div. 1 + Div. 2)
5 days
Register now »
*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
166A
Rank List
binary search
,
implementation
,
sortings
1100
x17883
165E
Compatible Numbers
bitmasks
,
brute force
,
dfs and similar
,
dp
2200
x7002
165D
Beard Graph
data structures
,
dsu
,
trees
2100
x1675
165C
Another Problem on Strings
binary search
,
brute force
,
dp
,
math
,
strings
,
two pointers
1600
x12382
165B
Burning Midnight Oil
binary search
,
implementation
1500
x18233
165A
Supercentral Point
implementation
1000
x23707
164E
Polycarpus and Tasks
3100
x67
164D
Minimum Diameter
binary search
,
brute force
3100
x244
164C
Machine Programming
flows
,
graphs
2400
x901
164B
Ancient Berland Hieroglyphs
two pointers
2000
x472
164A
Variable, or There and Back Again
dfs and similar
,
graphs
1700
x1018
163E
e-Government
data structures
,
dfs and similar
,
dp
,
strings
,
trees
2800
x1736
163D
Large Refrigerator
brute force
2900
x508
163C
Conveyor
sortings
,
two pointers
2100
x558
163B
Lemmings
binary search
2000
x1067
163A
Substring and Subsequence
dp
1700
x2715
162J
Brackets
*special problem
1800
x96
162I
Truncatable primes
*special problem
2000
x77
162H
Alternating case
*special problem
1800
x220
162G
Non-decimal sum
*special problem
2000
x65
162F
Factorial zeros
*special problem
1800
x202
162E
HQ9+
*special problem
1800
x178
162D
Remove digits
*special problem
1900
x228
162C
Prime factorization
*special problem
1800
x824
162B
Binary notation
*special problem
1800
x313
162A
Pentagonal numbers
*special problem
,
implementation
1100
x805
161E
Polycarpus the Safecracker
brute force
,
dp
2500
x469
161D
Distance in Tree
dfs and similar
,
dp
,
trees
1800
x15171
161C
Abracadabra
divide and conquer
2400
x653
161B
Discounts
constructive algorithms
,
greedy
,
sortings
1700
x1960
161A
Dress'em in Vests!
binary search
,
brute force
,
greedy
,
two pointers
1300
x4924
160E
Buses and People
binary search
,
data structures
,
sortings
2400
x593
160D
Edges in MST
dfs and similar
,
dsu
,
graphs
,
sortings
2300
x2795
160C
Find Pair
implementation
,
math
,
sortings
1700
x3458
160B
Unlucky Ticket
greedy
,
sortings
1100
x14133
160A
Twins
greedy
,
sortings
900
x119497
159E
Zebra Tower
*special problem
,
data structures
,
greedy
,
sortings
1700
x1001
159D
Palindrome pairs
*special problem
,
brute force
,
dp
,
strings
1500
x4325
159C
String Manipulation 1.0
*special problem
,
binary search
,
brute force
,
data structures
,
strings
1400
x3001
159B
Matchmaker
*special problem
,
greedy
,
sortings
1100
x3809
159A
Friends or Not
*special problem
,
greedy
,
implementation
1400
x2486
158E
Phone Talks
*special problem
,
dp
,
sortings
1900
x1463
158D
Ice Sculptures
*special problem
,
brute force
,
number theory
1300
x6253
158C
Cd and pwd commands
*special problem
,
data structures
,
implementation
1400
x9274
158B
Taxi
*special problem
,
greedy
,
implementation
1100
x87948
158A
Next Round
*special problem
,
implementation
800
x254083
157B
Trace
geometry
,
sortings
1000
x13257
157A
Game Outcome
brute force
800
x7684
156E
Mrs. Hudson's Pancakes
brute force
,
dp
3000
x163
156D
Clues
combinatorics
,
graphs
2500
x1598
156C
Cipher
combinatorics
,
dp
2000
x2430
156B
Suspects
constructive algorithms
,
data structures
,
implementation
1600
x2234
156A
Message
brute force
1700
x3046
155B
Combination
greedy
,
sortings
1100
x10342
155A
I_love_\%username\%
brute force
800
x76684
154E
Martian Colony
geometry
3000
x97
154D
Flatland Fencing
games
,
math
2400
x433
154C
Double Profiles
graphs
,
hashing
,
sortings
2300
x2875
154B
Colliders
math
,
number theory
1600
x4769
154A
Hometask
greedy
1600
x4065
153E
Euclidean Distance
*special problem
2100
x80
153D
Date Change
*special problem
2000
x83
153C
Caesar Cipher
*special problem
2200
x391
153B
Binary notation
*special problem
1800
x157
153A
A + B
*special problem
1600
x822
152E
Garden
bitmasks
,
dp
,
graphs
,
trees
2500
x487
152D
Frames
brute force
2600
x244
152C
Pocket Book
combinatorics
1400
x10678
152B
Steps
binary search
,
implementation
1300
x6756
152A
Marks
implementation
900
x16883
151B
Phone Numbers
implementation
,
strings
1200
x6392
151A
Soft Drinking
implementation
,
math
800
x74801
150E
Freezing with Style
binary search
,
data structures
,
divide and conquer
,
trees
3000
x870
150D
Mission Impassable
dp
,
strings
2600
x627
150C
Smart Cheater
data structures
,
math
,
probabilities
2200
x644
150B
Quantity of Strings
combinatorics
,
dfs and similar
,
graphs
,
math
1600
x4224
150A
Win or Freeze
games
,
math
,
number theory
1400
x7871
149E
Martian Strings
string suffix structures
,
strings
2300
x2293
149D
Coloring Brackets
dp
1900
x3917
149C
Division into Teams
greedy
,
math
,
sortings
1500
x5405
149B
Martian Clock
implementation
1600
x2264
149A
Business trip
greedy
,
implementation
,
sortings
900
x40159
148E
Porcelain
dp
1900
x4092
148D
Bag of mice
dp
,
games
,
math
,
probabilities
1800
x7350
148C
Terse princess
constructive algorithms
,
greedy
1700
x3149
148B
Escape
implementation
,
math
1500
x5515
148A
Insomnia cure
constructive algorithms
,
implementation
,
math
800
x94051
147B
Smile House
binary search
,
graphs
,
matrices
2500
x789
147A
Punctuation
implementation
,
strings
1300
x3659
146B
Lucky Mask
brute force
,
implementation
1300
x4411
146A
Lucky Ticket
implementation
800
x15183
145E
Lucky Queries
data structures
2400
x3205
145D
Lucky Pair
combinatorics
,
data structures
,
implementation
2900
x243
145C
Lucky Subsequence
combinatorics
,
dp
,
math
2100
x1911
145B
Lucky Number 2
constructive algorithms
1800
x2221
145A
Lucky Conversion
greedy
,
implementation
1200
x7175
144E
Competition
data structures
,
greedy
2200
x592
144D
Missile Silos
data structures
,
dfs and similar
,
graphs
,
shortest paths
1900
x4037
144C
Anagram Search
implementation
,
strings
1500
x4023
144B
Meeting
implementation
1300
x5288
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