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Rayan
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Before contest
Rayan Programming Contest 2024 - Selection (Codeforces Round 989, Div. 1 + Div. 2)
2 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
Standings
Custom test
Problems
#
Name
955A
Feed the cat
greedy
,
math
1100
x6678
954I
Yet Another String Matching Problem
fft
,
math
2200
x1032
954H
Path Counting
combinatorics
,
dp
2500
x591
954G
Castle Defense
binary search
,
data structures
,
greedy
,
two pointers
2000
x2171
954F
Runner's Problem
dp
,
matrices
,
sortings
2100
x1219
954E
Water Taps
binary search
,
greedy
,
sortings
2000
x1922
954D
Fight Against Traffic
dfs and similar
,
graphs
,
shortest paths
1600
x6708
954C
Matrix Walk
implementation
1700
x3796
954B
String Typing
implementation
,
strings
1400
x7291
954A
Diagonal Walking
implementation
800
x10552
952G
Puzzling Language
constructive algorithms
2200
x238
952F
2 + 2 != 4
2400
x397
952E
Cheese Board
2000
x642
952D
I'm Feeling Lucky!
probabilities
1800
x2453
952C
Ravioli Sort
implementation
1600
x2914
952B
A Map of the Cat
brute force
,
interactive
1900
x2059
952A
Quirky Quantifiers
math
800
x11299
950B
Intercepted Message
greedy
,
implementation
1100
x7600
950A
Left-handers, Right-handers and Ambidexters
implementation
,
math
800
x15423
949F
Astronomy
geometry
,
probabilities
3300
x59
949E
Binary Cards
brute force
2700
x648
949D
Curfew
binary search
,
brute force
,
greedy
,
sortings
2300
x832
949C
Data Center Maintenance
dfs and similar
,
graphs
1900
x2083
949B
A Leapfrog in the Array
constructive algorithms
,
math
1700
x3733
949A
Zebras
greedy
1600
x5410
948A
Protect Sheep
brute force
,
dfs and similar
,
graphs
,
implementation
900
x13912
946G
Almost Increasing Array
data structures
,
dp
2500
x696
946F
Fibonacci String Subsequences
combinatorics
,
dp
,
matrices
2400
x572
946E
Largest Beautiful Number
greedy
,
implementation
2200
x1108
946D
Timetable
dp
1800
x4475
946C
String Transformation
greedy
,
strings
1300
x8903
946B
Weird Subtraction Process
math
,
number theory
1100
x10908
946A
Partition
greedy
800
x16610
940F
Machine Learning
brute force
,
data structures
2600
x2670
940E
Cashback
data structures
,
dp
,
greedy
,
math
2000
x3800
940D
Alena And The Heater
binary search
,
implementation
1600
x3640
940C
Phone Numbers
constructive algorithms
,
implementation
,
strings
1500
x5906
940B
Our Tanya is Crying Out Loud
dp
,
greedy
1400
x9043
940A
Points on the line
brute force
,
greedy
,
sortings
1200
x8340
939F
Cutlet
data structures
,
dp
2400
x982
939E
Maximize!
binary search
,
greedy
,
ternary search
,
two pointers
1800
x3165
939D
Love Rescue
dfs and similar
,
dsu
,
graphs
,
greedy
,
strings
1600
x7367
939C
Convenient For Everybody
binary search
,
two pointers
1600
x4645
939B
Hamster Farm
implementation
1000
x10633
939A
Love Triangle
graphs
800
x25624
938G
Shortest Path Queries
bitmasks
,
data structures
,
dsu
,
graphs
2900
x918
938F
Erasing Substrings
bitmasks
,
dp
,
greedy
2700
x508
938E
Max History
combinatorics
,
math
2300
x1332
938D
Buy a Ticket
data structures
,
graphs
,
shortest paths
2000
x5776
938C
Constructing Tests
binary search
,
brute force
,
constructive algorithms
1700
x3326
938B
Run For Your Prize
brute force
,
greedy
1100
x8880
938A
Word Correction
implementation
800
x11506
937B
Vile Grasshoppers
brute force
,
math
,
number theory
1400
x6925
937A
Olympiad
implementation
,
sortings
800
x15268
936E
Iqea
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
shortest paths
,
trees
3400
x199
936D
World of Tank
dp
,
greedy
3000
x332
936C
Lock Puzzle
constructive algorithms
,
implementation
,
strings
2300
x1183
936B
Sleepy Game
dfs and similar
,
dp
,
games
,
graphs
2100
x3274
936A
Save Energy!
binary search
,
implementation
,
math
1700
x4372
935F
Fafa and Array
data structures
,
greedy
2600
x368
935E
Fafa and Ancient Mathematics
dfs and similar
,
dp
,
trees
2300
x899
935D
Fafa and Ancient Alphabet
math
,
probabilities
1900
x2644
935C
Fifa and Fafa
geometry
1600
x4763
935B
Fafa and the Gates
implementation
900
x11646
935A
Fafa and his Company
brute force
,
implementation
800
x43461
934B
A Prosperous Lot
constructive algorithms
,
implementation
1200
x8713
934A
A Compatible Pair
brute force
,
games
1400
x7020
933E
A Preponderant Reunion
constructive algorithms
,
dp
3200
x226
933D
A Creative Cutout
brute force
,
combinatorics
,
math
2900
x333
933C
A Colourful Prospect
geometry
,
graphs
2700
x585
933B
A Determined Cleanup
math
2000
x1928
933A
A Twisty Movement
dp
1800
x4997
932G
Palindrome Partition
dp
,
string suffix structures
,
strings
2900
x954
932F
Escape Through Leaf
data structures
,
dp
,
geometry
2700
x2988
932E
Team Work
combinatorics
,
dp
,
math
2400
x2900
932D
Tree
binary search
,
dp
,
trees
2200
x1753
932C
Permutation Cycle
brute force
,
constructive algorithms
1600
x4040
932B
Recursive Queries
binary search
,
data structures
,
dfs and similar
1300
x8201
932A
Palindromic Supersequence
constructive algorithms
800
x10314
931C
Laboratory Work
implementation
,
math
1700
x3364
931B
World Cup
constructive algorithms
,
implementation
1200
x7159
931A
Friends Meeting
brute force
,
greedy
,
implementation
,
math
800
x12240
930E
Coins Exhibition
data structures
,
dp
,
math
2900
x437
930D
Game with Tokens
data structures
,
games
,
implementation
2500
x414
930C
Teodor is not a liar!
data structures
,
dp
1900
x2147
930B
Game with String
implementation
,
probabilities
,
strings
1600
x2685
930A
Peculiar apple-tree
dfs and similar
,
graphs
,
trees
1500
x7229
929D
Пограничные врата
2400
x152
929C
Красивая команда
*special problem
,
combinatorics
,
math
1700
x1162
929B
Места в самолёте
*special problem
,
implementation
1300
x2045
929A
Прокат велосипедов
*special problem
,
greedy
,
implementation
1400
x2500
928D
Autocompletion
*special problem
,
strings
,
trees
1900
x813
928C
Dependency management
*special problem
,
graphs
,
implementation
1900
x888
928B
Chat
*special problem
,
dp
1400
x2541
928A
Login Verification
*special problem
,
strings
1200
x3403
927A
BuberPool Taxi Optimization
*special problem
,
interactive
2900
x1
926J
Segments
data structures
2100
x392
926I
A Vital Problem
1700
x666
926H
Endless Roses Most Beautiful
2200
x219
926G
Large Bouquets
1500
x1482
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