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Rayan
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Rayan Programming Contest 2024 - Selection (Codeforces Round, Div. 1 + Div. 2)
5 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
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Custom test
Problems
#
Name
1011A
Stages
greedy
,
implementation
,
sortings
900
x12276
1009A
Game Shopping
implementation
800
x11824
1008B
Turn the Rectangles
greedy
,
sortings
1000
x11472
1008A
Romaji
implementation
,
strings
900
x15156
1006C
Three Parts of the Array
binary search
,
data structures
,
two pointers
1200
x21485
1006B
Polycarp's Practice
greedy
,
implementation
,
sortings
1200
x13359
1006A
Adjacent Replacements
implementation
800
x21690
1005B
Delete from the Left
brute force
,
implementation
,
strings
900
x23754
1005A
Tanya and Stairways
implementation
800
x24016
1004A
Sonya and Hotels
implementation
900
x11273
1003A
Polycarp's Pockets
implementation
800
x27360
1002D1
Oracle for f(x) = b * x mod 2
1200
x404
1002A1
Generate superposition of all basis states
800
x848
1001H
Oracle for f(x) = parity of the number of 1s in x
*special problem
1200
x533
1001A
Generate plus state or minus state
*special problem
1100
x1014
1000A
Codehorses T-shirts
greedy
,
implementation
1200
x8834
999C
Alphabetic Removals
implementation
1200
x18510
999B
Reversing Encryption
implementation
900
x17691
999A
Mishka and Contest
brute force
,
implementation
800
x23190
998B
Cutting
dp
,
greedy
,
sortings
1200
x13204
998A
Balloons
constructive algorithms
,
implementation
1000
x9644
996A
Hit the Lottery
dp
,
greedy
800
x92819
994A
Fingerprints
implementation
800
x14224
992A
Nastya and an Array
implementation
,
sortings
800
x13203
991B
Getting an A
greedy
,
sortings
900
x12674
991A
If at first you don't succeed...
implementation
1000
x10650
990B
Micro-World
greedy
,
sortings
1200
x8159
990A
Commentary Boxes
implementation
,
math
1000
x10632
989B
A Tide of Riverscape
constructive algorithms
,
strings
1200
x7064
989A
A Blend of Springtime
implementation
,
strings
900
x10392
988B
Substrings Sort
sortings
,
strings
1100
x18590
988A
Diverse Team
brute force
,
implementation
800
x25276
987B
High School: Become Human
math
1100
x11656
987A
Infinity Gauntlet
implementation
800
x16653
985B
Switches and Lamps
implementation
1200
x7411
985A
Chess Placing
implementation
1100
x8175
984B
Minesweeper
implementation
1100
x7391
984A
Game
sortings
800
x19550
982A
Row
brute force
,
constructive algorithms
1200
x9102
981B
Businessmen Problems
sortings
1000
x7009
981A
Antipalindrome
brute force
,
implementation
,
strings
900
x9436
980A
Links and Pearls
implementation
,
math
900
x10444
979A
Pizza, Pizza, Pizza!!!
math
1000
x13851
978C
Letters
binary search
,
implementation
,
two pointers
1000
x25962
978B
File Name
greedy
,
strings
800
x36705
978A
Remove Duplicates
implementation
800
x27385
977C
Less or Equal
sortings
1200
x35431
977B
Two-gram
implementation
,
strings
900
x40178
977A
Wrong Subtraction
implementation
800
x171536
976A
Minimum Binary Number
implementation
800
x10563
975B
Mancala
brute force
,
implementation
1100
x6871
975A
Aramic script
implementation
,
strings
900
x9340
967B
Watering System
math
,
sortings
1000
x7196
967A
Mind the Gap
implementation
1100
x4376
965A
Paper Airplanes
math
800
x9583
964A
Splits
math
800
x9716
961B
Lecture Sleep
data structures
,
dp
,
implementation
,
two pointers
1200
x21269
961A
Tetris
implementation
900
x10085
960A
Check the string
implementation
1200
x8229
959B
Mahmoud and Ehab and the message
dsu
,
greedy
,
implementation
1200
x9679
959A
Mahmoud and Ehab and the even-odd game
games
,
math
800
x47940
958C1
Encryption (easy)
brute force
1200
x2913
958B1
Maximum Control (easy)
implementation
1000
x3447
955A
Feed the cat
greedy
,
math
1100
x6678
954A
Diagonal Walking
implementation
800
x10551
952A
Quirky Quantifiers
math
800
x11296
950B
Intercepted Message
greedy
,
implementation
1100
x7599
950A
Left-handers, Right-handers and Ambidexters
implementation
,
math
800
x15418
948A
Protect Sheep
brute force
,
dfs and similar
,
graphs
,
implementation
900
x13910
946B
Weird Subtraction Process
math
,
number theory
1100
x10906
946A
Partition
greedy
800
x16603
940A
Points on the line
brute force
,
greedy
,
sortings
1200
x8337
939B
Hamster Farm
implementation
1000
x10631
939A
Love Triangle
graphs
800
x25537
938B
Run For Your Prize
brute force
,
greedy
1100
x8880
938A
Word Correction
implementation
800
x11505
937A
Olympiad
implementation
,
sortings
800
x15265
935B
Fafa and the Gates
implementation
900
x11645
935A
Fafa and his Company
brute force
,
implementation
800
x43438
934B
A Prosperous Lot
constructive algorithms
,
implementation
1200
x8711
932A
Palindromic Supersequence
constructive algorithms
800
x10312
931B
World Cup
constructive algorithms
,
implementation
1200
x7158
931A
Friends Meeting
brute force
,
greedy
,
implementation
,
math
800
x12237
928A
Login Verification
*special problem
,
strings
1200
x3403
920B
Tea Queue
implementation
1200
x7396
920A
Water The Garden
implementation
1000
x7795
919B
Perfect Number
binary search
,
brute force
,
dp
,
implementation
,
number theory
1100
x28410
919A
Supermarket
brute force
,
greedy
,
implementation
800
x16161
918B
Radio Station
implementation
,
strings
900
x16919
918A
Eleven
brute force
,
implementation
800
x17141
916A
Jamie and Alarm Snooze
brute force
,
implementation
,
math
900
x8617
915A
Garden
implementation
900
x14822
914B
Conan and Agasa play a Card Game
games
,
greedy
,
implementation
1200
x8637
914A
Perfect Squares
brute force
,
implementation
,
math
900
x14204
913B
Christmas Spruce
implementation
,
trees
1200
x16182
913A
Modular Exponentiation
implementation
,
math
900
x21408
912A
Tricky Alchemy
implementation
800
x13540
911B
Two Cakes
binary search
,
brute force
,
implementation
1200
x11480
911A
Nearest Minimums
implementation
1100
x11510
910A
The Way to Home
dfs and similar
,
dp
,
greedy
,
implementation
800
x12128
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