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Rayan
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Before contest
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
1260B
Obtain Two Zeroes
binary search
,
math
1300
x15881
1257C
Dominated Subarray
greedy
,
implementation
,
sortings
,
strings
,
two pointers
1200
x16076
1255B
Fridge Lockers
graphs
,
implementation
1100
x12022
1249C1
Good Numbers (easy version)
brute force
,
greedy
,
implementation
1300
x15645
1249B2
Books Exchange (hard version)
dfs and similar
,
dsu
,
math
1300
x16944
1245B
Restricted RPS
constructive algorithms
,
dp
,
greedy
1200
x13888
1238B
Kill `Em All
greedy
,
sortings
1300
x13692
1237B
Balanced Tunnel
data structures
,
sortings
,
two pointers
1300
x16360
1236C
Labs
constructive algorithms
,
greedy
,
implementation
1300
x10181
1234B2
Social Network (hard version)
data structures
,
implementation
1300
x16994
1231C
Increasing Matrix
greedy
1100
x3881
1227B
Box
constructive algorithms
1200
x9706
1227A
Math Problem
math
1100
x9841
1225B2
TV Subscriptions (Hard Version)
implementation
,
two pointers
1300
x10762
1221C
Perfect Team
binary search
,
math
1200
x21341
1221B
Knights
constructive algorithms
,
greedy
1100
x11988
1220C
Substring Game in the Lesson
games
,
greedy
,
strings
1300
x10294
1220B
Multiplication Table
math
,
number theory
1300
x11670
1217A
Creating a Character
binary search
,
math
1300
x15061
1216D
Swords
math
1300
x11187
1214C
Bad Sequence
data structures
,
greedy
1200
x13340
1214B
Badges
brute force
,
math
1100
x10885
1213C
Book Reading
math
1200
x18557
1213B
Bad Prices
data structures
,
implementation
1100
x26946
1209B
Koala and Lights
implementation
,
math
,
number theory
1300
x8182
1207B
Square Filling
constructive algorithms
,
greedy
,
implementation
1200
x13306
1205A
Almost Equal
constructive algorithms
,
greedy
,
math
1200
x14198
1203C
Common Divisors
implementation
,
math
1300
x20902
1203B
Equal Rectangles
greedy
,
math
1200
x16048
1202A
You Are Given Two Binary Strings...
bitmasks
,
greedy
1100
x9418
1200B
Block Adventure
dp
,
greedy
1200
x14024
1196B
Odd Sum Segments
constructive algorithms
,
math
1200
x16708
1194C
From S To T
implementation
,
strings
1300
x13281
1194B
Yet Another Crosses Problem
implementation
1300
x10344
1191B
Tokitsukaze and Mahjong
brute force
,
implementation
1200
x9620
1189B
Number Circle
greedy
,
math
,
sortings
1100
x14344
1187B
Letters Shop
binary search
,
implementation
,
strings
1300
x12304
1185C1
Exam in BerSU (easy version)
greedy
,
sortings
1200
x11445
1185B
Email from Polycarp
implementation
,
strings
1200
x13446
1184A1
Heidi Learns Hashing (Easy)
brute force
,
math
,
number theory
1200
x5999
1182B
Plus from Picture
dfs and similar
,
implementation
,
strings
1300
x11182
1178C
Tiles
combinatorics
,
greedy
,
math
1300
x12051
1178B
WOW Factor
dp
,
strings
1300
x15614
1176C
Lose it!
dp
,
greedy
,
implementation
1300
x14272
1176B
Merge it!
math
1100
x17224
1174C
Ehab and a Special Coloring Problem
constructive algorithms
,
number theory
1300
x12044
1174B
Ehab Is an Odd Person
sortings
1200
x15591
1173B
Nauuo and Chess
constructive algorithms
,
greedy
1100
x9097
1166B
All the Vowels Please
constructive algorithms
,
math
,
number theory
1100
x11511
1165C
Good String
greedy
1300
x13043
1165A
Remainder
implementation
,
math
1100
x13851
1159B
Expansion coefficient of the array
implementation
,
math
1300
x7099
1157C1
Increasing Subsequence (easy version)
greedy
1300
x12709
1157B
Long Number
greedy
1300
x14795
1157A
Reachable Numbers
implementation
1100
x15752
1155C
Alarm Clocks Everywhere
math
,
number theory
1300
x9254
1155B
Game with Telephone Numbers
games
,
greedy
,
implementation
1200
x11939
1154B
Make Them Equal
math
1200
x16733
1153B
Serval and Toy Bricks
constructive algorithms
,
greedy
1200
x9094
1152B
Neko Performs Cat Furrier Transform
bitmasks
,
constructive algorithms
,
dfs and similar
,
math
1300
x8958
1149A
Prefix Sum Primes
constructive algorithms
,
greedy
,
math
,
number theory
1200
x15405
1146B
Hate "A"
implementation
,
strings
1100
x8637
1143B
Nirvana
brute force
,
math
,
number theory
1200
x10586
1140D
Minimum Triangulation
dp
,
greedy
,
math
1200
x12684
1140B
Good String
implementation
,
strings
1200
x11366
1133C
Balanced Team
sortings
,
two pointers
1200
x23505
1133B
Preparation for International Women's Day
math
,
number theory
1200
x12984
1132A
Regular Bracket Sequence
greedy
,
implementation
1100
x9645
1131C
Birthday
binary search
,
greedy
,
sortings
1200
x14905
1130B
Two Cakes
greedy
1200
x7939
1121B
Mike and Children
brute force
,
implementation
1200
x9111
1121A
Technogoblet of Fire
implementation
,
sortings
1100
x7203
1119B
Alyona and a Narrow Fridge
binary search
,
flows
,
greedy
,
sortings
1300
x11239
1119A
Ilya and a Colorful Walk
greedy
,
implementation
1100
x10865
1118B
Tanya and Candies
implementation
1200
x12261
1117A
Best Subsegment
implementation
,
math
1100
x11048
1115G1
AND oracle
*special problem
1100
x389
1113B
Sasha and Magnetic Machines
greedy
,
number theory
1300
x7750
1108C
Nice Garland
brute force
,
greedy
,
math
1300
x12015
1108B
Divisors of Two Integers
brute force
,
greedy
,
math
,
number theory
1100
x23340
1107C
Brutality
greedy
,
sortings
,
two pointers
1300
x10024
1105B
Zuhair and Strings
brute force
,
implementation
,
strings
1100
x9929
1105A
Salem and Sticks
brute force
,
implementation
1100
x10998
1104B
Game with string
data structures
,
implementation
,
math
1200
x15036
1102C
Doors Breaking and Repairing
games
1200
x13154
1101B
Accordion
greedy
,
implementation
1300
x10640
1100C
NN and the Optical Illusion
binary search
,
geometry
,
math
1200
x10144
1100B
Build a Contest
data structures
,
implementation
1300
x11187
1099C
Postcard
constructive algorithms
,
implementation
1200
x9673
1099B
Squares and Segments
binary search
,
constructive algorithms
,
math
1100
x11174
1097B
Petr and a Combination Lock
bitmasks
,
brute force
,
dp
1200
x29261
1096B
Substring Removal
combinatorics
,
math
,
strings
1300
x10654
1093C
Mishka and the Last Exam
greedy
1300
x9363
1091B
New Year and the Treasure Geolocation
brute force
,
constructive algorithms
,
greedy
,
implementation
1200
x10695
1090A
Company Merging
greedy
1300
x4258
1085B
Div Times Mod
math
1100
x9349
1084B
Kvass and the Fair Nut
greedy
,
implementation
1200
x7836
1082A
Vasya and Book
implementation
,
math
1200
x8625
1077C
Good Array
1300
x17745
1076C
Meme Problem
binary search
,
math
1300
x12522
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