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Rayan
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Rayan Programming Contest 2024 - Selection (Codeforces Round 989, Div. 1 + Div. 2)
3 days
Register now »
*has extra registration
→ Filter Problems
Difficulty:
—
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
169B
Replacing Digits
greedy
1100
x3322
166A
Rank List
binary search
,
implementation
,
sortings
1100
x17890
162A
Pentagonal numbers
*special problem
,
implementation
1100
x806
161A
Dress'em in Vests!
binary search
,
brute force
,
greedy
,
two pointers
1300
x4924
160B
Unlucky Ticket
greedy
,
sortings
1100
x14135
159B
Matchmaker
*special problem
,
greedy
,
sortings
1100
x3809
158D
Ice Sculptures
*special problem
,
brute force
,
number theory
1300
x6255
158B
Taxi
*special problem
,
greedy
,
implementation
1100
x88011
155B
Combination
greedy
,
sortings
1100
x10344
152B
Steps
binary search
,
implementation
1300
x6760
151B
Phone Numbers
implementation
,
strings
1200
x6394
147A
Punctuation
implementation
,
strings
1300
x3660
146B
Lucky Mask
brute force
,
implementation
1300
x4414
145A
Lucky Conversion
greedy
,
implementation
1200
x7179
144B
Meeting
implementation
1300
x5289
143B
Help Kingdom of Far Far Away 2
implementation
,
strings
1200
x4997
136B
Ternary Logic
implementation
,
math
1100
x4886
135A
Replacement
greedy
,
implementation
,
sortings
1300
x7648
134A
Average Numbers
brute force
,
implementation
1200
x4008
133B
Unary
implementation
1200
x8828
132A
Turing Tape
implementation
1300
x2788
131B
Opposites Attract
implementation
,
math
1200
x7059
129B
Students and Shoelaces
brute force
,
dfs and similar
,
graphs
,
implementation
1200
x12378
123A
Prime Permutation
implementation
,
number theory
,
strings
1300
x3641
121A
Lucky Sum
implementation
1100
x9283
120C
Winnie-the-Pooh and honey
implementation
,
math
1100
x3684
120B
Quiz League
implementation
1100
x3444
117A
Elevator
implementation
,
math
1300
x2026
116B
Little Pigs and Wolves
greedy
,
implementation
1100
x13800
112B
Petya and Square
implementation
,
math
1200
x4198
110B
Lucky String
constructive algorithms
,
strings
1100
x10250
103A
Testing Pants for Sadness
greedy
,
implementation
,
math
1100
x6016
102A
Clothes
brute force
1200
x3031
101A
Homework
greedy
1200
x3873
100A
Carpeting the Room
*special problem
,
implementation
1100
x931
99B
Help Chef Gerasim
implementation
,
sortings
1300
x2998
96B
Lucky Numbers (easy)
binary search
,
bitmasks
,
brute force
1300
x15698
94B
Friends
graphs
,
implementation
,
math
1300
x4706
92B
Binary Number
greedy
1300
x4881
90B
African Crossword
implementation
,
strings
1100
x5350
88A
Chord
brute force
,
implementation
1200
x3839
85A
Domino
constructive algorithms
,
implementation
1300
x1796
83A
Magical Array
math
1300
x6286
82A
Double Cola
implementation
,
math
1100
x30409
80B
Depression
geometry
,
math
1200
x4450
79A
Bus Game
greedy
1200
x4098
78B
Easter Eggs
constructive algorithms
,
implementation
1200
x13703
72C
Extraordinarily Nice Numbers
*special problem
,
math
1200
x923
71B
Progress Bar
implementation
,
math
1300
x4564
70A
Cookies
math
1300
x3296
69B
Bets
greedy
,
implementation
1200
x3286
68A
Irrational problem
implementation
,
number theory
1100
x4962
66B
Petya and Countryside
brute force
,
implementation
1100
x20706
66A
Petya and Java
implementation
,
strings
1300
x6434
64A
Factorial
*special problem
,
implementation
1300
x3144
63B
Settlers' Training
implementation
1200
x4842
62A
A Student's Dream
greedy
,
math
1300
x3462
61B
Hard Work
strings
1300
x3884
60A
Where Are My Flakes?
implementation
,
two pointers
1300
x3663
59B
Fortune Telling
implementation
,
number theory
1200
x6925
58B
Coins
greedy
1300
x12279
57A
Square Earth?
dfs and similar
,
greedy
,
implementation
1300
x2931
56B
Spoilt Permutation
implementation
1300
x3742
55A
Flea travel
implementation
,
math
1200
x3475
54A
Presents
implementation
1300
x2083
53C
Little Frog
constructive algorithms
1200
x6522
53A
Autocomplete
implementation
1100
x5127
51A
Cheaterius's Problem
implementation
1300
x1836
48B
Land Lot
brute force
,
implementation
1200
x2701
47B
Coins
implementation
1200
x14143
46B
T-shirts from Sponsor
implementation
1100
x3711
44C
Holidays
implementation
1300
x3494
43C
Lucky Tickets
greedy
1300
x4290
43B
Letter
implementation
,
strings
1100
x17067
41C
Email address
expression parsing
,
implementation
1300
x3774
40A
Find Color
constructive algorithms
,
geometry
,
implementation
,
math
1300
x4063
39H
Multiplication Table
implementation
1300
x2777
39F
Pacifist frogs
implementation
1300
x1579
39D
Cubical Planet
math
1100
x4015
39B
Company Income Growth
greedy
1300
x2686
38B
Chess
brute force
,
implementation
,
math
1200
x3549
36A
Extra-terrestrial Intelligence
implementation
1300
x3035
34C
Page Numbers
expression parsing
,
implementation
,
sortings
,
strings
1300
x4266
33A
What is for dinner?
greedy
,
implementation
1200
x4128
31A
Worms Evolution
implementation
1200
x10416
27B
Tournament
bitmasks
,
brute force
,
dfs and similar
,
greedy
1300
x5386
27A
Next Test
implementation
,
sortings
1200
x20509
25B
Phone numbers
implementation
1100
x9764
25A
IQ test
brute force
1300
x87474
23A
You're Given a String...
brute force
,
greedy
1200
x5377
18C
Stripe
data structures
,
implementation
1200
x13333
15A
Cottage Village
implementation
,
sortings
1200
x3938
12C
Fruits
greedy
,
implementation
,
sortings
1100
x6276
12B
Correct Solution?
implementation
,
sortings
1100
x8616
9C
Hexadecimal's Numbers
brute force
,
implementation
,
math
1200
x13029
9B
Running Student
brute force
,
geometry
,
implementation
1200
x5546
8A
Train and Peter
strings
1200
x5947
7A
Kalevitch and Chess
brute force
,
constructive algorithms
1100
x7266
6C
Alice, Bob and Chocolate
greedy
,
two pointers
1200
x14315
6B
President's Office
implementation
1100
x13145
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