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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
1633B
Minority
greedy
800
x27914
1633A
Div. 7
brute force
800
x33494
1632A
ABC
implementation
800
x29598
1631A
Min Max Swap
greedy
800
x29600
1629B
GCD Arrays
greedy
,
math
,
number theory
800
x23579
1629A
Download More RAM
brute force
,
greedy
,
sortings
800
x29363
1627A
Not Shading
constructive algorithms
,
implementation
800
x24103
1626A
Equidistant Letters
constructive algorithms
,
sortings
800
x29076
1625A
Ancient Civilization
bitmasks
,
greedy
,
math
800
x17300
1624A
Plus One on the Subset
math
800
x52667
1623A
Robot Cleaner
brute force
,
implementation
,
math
800
x20092
1622A
Construct a Rectangle
geometry
,
math
800
x30258
1621A
Stable Arrangement of Rooks
constructive algorithms
800
x23889
1620A
Equal or Not Equal
constructive algorithms
,
dsu
,
implementation
800
x21674
1619B
Squares and Cubes
implementation
,
math
800
x31049
1619A
Square String?
implementation
,
strings
800
x52710
1618B
Missing Bigram
implementation
800
x22762
1618A
Polycarp and Sums of Subsequences
math
,
sortings
800
x32508
1617A
Forbidden Subsequence
constructive algorithms
,
greedy
,
sortings
,
strings
800
x16312
1616A
Integer Diversity
implementation
800
x22846
1615A
Closing The Gap
greedy
,
math
800
x20839
1614A
Divan and a Store
brute force
,
constructive algorithms
,
greedy
800
x23522
1612A
Distance
brute force
,
constructive algorithms
800
x17709
1611B
Team Composition: Programmers and Mathematicians
binary search
,
constructive algorithms
,
math
800
x29831
1611A
Make Even
constructive algorithms
,
math
800
x31613
1608A
Find Array
constructive algorithms
,
math
800
x19133
1607A
Linear Keyboard
implementation
,
strings
800
x37663
1605A
A.M. Deviation
math
,
number theory
800
x20704
1604A
Era
greedy
800
x21635
1602A
Two Subsequences
implementation
800
x19062
1598A
Computer Game
brute force
,
dfs and similar
,
dp
,
implementation
800
x23575
1594A
Consecutive Sum Riddle
math
800
x24894
1593A
Elections
math
800
x37111
1592A
Gamer Hemose
binary search
,
greedy
,
math
,
sortings
800
x22410
1585A
Life of a Flower
implementation
800
x17922
1584A
Mathematical Addition
math
800
x14947
1583A
Windblume Ode
math
,
number theory
800
x13773
1582A
Luntik and Concerts
math
800
x18610
1581A
CQXYM Count Permutations
combinatorics
,
math
,
number theory
800
x13508
1579A
Casimir's String Solitaire
math
,
strings
800
x39120
1574A
Regular Bracket Sequences
constructive algorithms
800
x21953
1573A
Countdown
greedy
800
x21233
1571A
Sequence of Comparisons
*special problem
800
x1327
1569A
Balanced Substring
implementation
800
x25626
1567A
Domino Disaster
implementation
,
strings
800
x30225
1566B
MIN-MEX Cut
bitmasks
,
constructive algorithms
,
dp
,
greedy
800
x19764
1566A
Median Maximization
binary search
,
greedy
,
math
800
x23571
1562A
The Miracle and the Sleeper
greedy
,
math
800
x25695
1561A
Simply Strange Sort
brute force
,
implementation
,
sortings
800
x16614
1560C
Infinity Table
implementation
,
math
800
x26734
1560B
Who's Opposite?
math
800
x35959
1560A
Dislike of Threes
implementation
800
x60967
1557A
Ezzat and Two Subsequences
brute force
,
math
,
sortings
800
x28006
1556A
A Variety of Operations
math
800
x18119
1554A
Cherry
greedy
800
x29499
1553A
Digits Sum
math
,
number theory
800
x31275
1552A
Subsequence Permutation
sortings
,
strings
800
x23955
1551B1
Wonderful Coloring - 1
greedy
,
strings
800
x29626
1551A
Polycarp and Coins
greedy
,
math
800
x51559
1550A
Find The Array
greedy
,
math
800
x28253
1549B
Gregor and the Pawn Game
dfs and similar
,
dp
,
flows
,
graph matchings
,
graphs
,
greedy
,
implementation
800
x24584
1549A
Gregor and Cryptography
math
,
number theory
800
x32759
1547B
Alphabetical Strings
greedy
,
implementation
,
strings
800
x26518
1547A
Shortest Path with Obstacle
implementation
,
math
800
x30600
1546A
AquaMoon and Two Arrays
brute force
,
greedy
800
x18251
1542A
Odd Set
math
800
x45294
1541A
Pretty Permutations
constructive algorithms
,
greedy
,
implementation
800
x29533
1539B
Love Song
dp
,
implementation
,
strings
800
x24693
1538B
Friends and Candies
greedy
,
math
800
x31794
1538A
Stone Game
brute force
,
dp
,
greedy
800
x37165
1537A
Arithmetic Array
greedy
,
math
800
x37568
1536A
Omkar and Bad Story
brute force
,
constructive algorithms
800
x20238
1535A
Fair Playoff
brute force
,
implementation
800
x50269
1534A
Colour the Flag
brute force
,
implementation
800
x12779
1530B
Putting Plates
constructive algorithms
,
implementation
800
x15812
1530A
Binary Decimal
greedy
,
math
800
x21136
1529A
Eshag Loves Big Arrays
constructive algorithms
,
greedy
,
math
800
x29860
1527A
And Then There Were K
bitmasks
800
x36054
1526A
Mean Inequality
constructive algorithms
,
sortings
800
x24260
1525A
Potion-making
math
,
number theory
800
x25681
1523A
Game of Life
implementation
800
x13522
1520B
Ordinary Numbers
brute force
,
math
,
number theory
800
x44874
1520A
Do Not Be Distracted!
brute force
,
implementation
800
x52279
1519B
The Cake Is a Lie
dp
,
math
800
x31081
1519A
Red and Blue Beans
math
800
x29045
1517A
Sum of 2050
greedy
,
math
800
x25629
1516A
Tit for Tat
greedy
800
x23512
1515A
Phoenix and Gold
constructive algorithms
,
greedy
,
math
800
x20264
1514A
Perfectly Imperfect Array
math
,
number theory
800
x24293
1513A
Array and Peaks
constructive algorithms
,
implementation
800
x19446
1512B
Almost Rectangle
implementation
800
x25495
1512A
Spy Detected!
brute force
,
implementation
800
x65318
1511A
Review Site
greedy
800
x27752
1509A
Average Height
constructive algorithms
800
x26082
1506A
Strange Table
math
800
x30771
1504A
Déjà Vu
constructive algorithms
,
strings
800
x21781
1501A
Alexey and Train
implementation
800
x11647
1499A
Domino on Windowsill
combinatorics
,
constructive algorithms
,
math
800
x21312
1498A
GCD Sum
brute force
,
math
800
x23367
1497A
Meximization
brute force
,
data structures
,
greedy
,
sortings
800
x24566
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