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Rayan
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Hello 2025
7 days
→ 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
1778C
Flexible String
bitmasks
,
brute force
,
strings
1600
x8504
1777C
Quiz Master
binary search
,
math
,
number theory
,
sortings
,
two pointers
1700
x8888
1776L
Controllers
binary search
,
math
1500
x6447
1776F
Train Splitting
constructive algorithms
,
graphs
,
greedy
1700
x3567
1775D
Friendly Spiders
dfs and similar
,
graphs
,
math
,
number theory
,
shortest paths
1800
x6451
1775C
Interesting Sequence
bitmasks
,
math
1600
x10813
1774D
Same Count One
brute force
,
constructive algorithms
,
greedy
,
implementation
,
two pointers
1600
x8095
1774B
Coloring
constructive algorithms
,
greedy
,
math
1500
x12530
1773E
Easy Assembly
greedy
,
sortings
1400
x5057
1772E
Permutation Game
games
1700
x6896
1772D
Absolute Sorting
constructive algorithms
,
math
1400
x16313
1771C
Hossam and Trainees
greedy
,
math
,
number theory
1600
x9929
1771B
Hossam and Friends
binary search
,
constructive algorithms
,
dp
,
two pointers
1400
x15063
1770C
Koxia and Number Theory
brute force
,
chinese remainder theorem
,
math
,
number theory
1700
x8749
1769D1
Игра в Девятку I
*special problem
,
brute force
,
dp
1800
x385
1769B2
Копирование файлов II
*special problem
,
binary search
,
brute force
,
math
1400
x889
1768D
Lucky Permutation
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
1800
x7341
1767D
Playoff
combinatorics
,
constructive algorithms
,
dp
,
greedy
,
math
1500
x10117
1766D
Lucky Chains
math
,
number theory
1600
x9129
1765N
Number Reduction
greedy
1500
x5035
1765K
Torus Path
greedy
,
math
1500
x6003
1765D
Watch the Videos
binary search
,
constructive algorithms
,
two pointers
1700
x4332
1764C
Doremy's City Construction
graphs
,
greedy
1400
x9575
1762C
Binary Strings are Fun
combinatorics
,
math
1400
x9325
1761C
Set Construction
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
1400
x9747
1760G
SlavicG's Favorite Problem
bitmasks
,
dfs and similar
,
graphs
1700
x7576
1760F
Quests
binary search
,
greedy
,
sortings
1500
x12611
1759F
All Possible Digits
binary search
,
data structures
,
greedy
,
math
,
number theory
1800
x4002
1759E
The Humanoid
brute force
,
dp
,
sortings
1500
x11092
1759D
Make It Round
brute force
,
number theory
1400
x14160
1758D
Range = √Sum
binary search
,
brute force
,
constructive algorithms
,
math
,
two pointers
1800
x7467
1758C
Almost All Multiples
greedy
,
number theory
1400
x13898
1753B
Factorial Divisibility
math
,
number theory
1600
x13088
1753A2
Make Nonzero Sum (hard version)
constructive algorithms
,
dp
,
greedy
1500
x10573
1750D
Count GCD
combinatorics
,
math
,
number theory
1800
x6112
1750C
Complementary XOR
constructive algorithms
,
implementation
1400
x9692
1749C
Number Game
binary search
,
data structures
,
games
,
greedy
,
implementation
1400
x14214
1748C
Zero-Sum Prefixes
brute force
,
data structures
,
dp
,
greedy
,
implementation
1600
x11392
1748B
Diverse Substrings
brute force
,
implementation
,
strings
1400
x15282
1744E1
Divisible Numbers (easy version)
brute force
,
math
,
number theory
1500
x11111
1743D
Problem with Random Tests
brute force
,
dp
,
greedy
,
probabilities
1700
x7698
1742G
Orray
bitmasks
,
brute force
,
greedy
,
math
,
sortings
1500
x11138
1742F
Smaller
constructive algorithms
,
greedy
,
strings
1500
x12083
1741E
Sending a Sequence Over the Network
dp
1600
x12880
1740E
Hanging Hearts
constructive algorithms
,
data structures
,
dfs and similar
,
dp
,
greedy
,
trees
1800
x4439
1740D
Knowledge Cards
constructive algorithms
,
data structures
1500
x8244
1740C
Bricks and Bags
constructive algorithms
,
games
,
greedy
,
sortings
1400
x11214
1739C
Card Game
combinatorics
,
constructive algorithms
,
dp
,
games
1500
x9231
1738C
Even Number Addicts
dp
,
games
,
greedy
,
math
1500
x11437
1737C
Ela and Crickets
constructive algorithms
,
games
,
implementation
,
math
1500
x5859
1735D
Meta-set
brute force
,
combinatorics
,
data structures
,
hashing
,
math
1700
x5593
1735C
Phase Shift
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
strings
1400
x10047
1734D
Slime Escape
data structures
,
dp
,
greedy
,
two pointers
1800
x6416
1733D1
Zero-One (Easy Version)
constructive algorithms
,
greedy
,
math
1400
x13728
1732D1
Balance (Easy version)
brute force
,
data structures
,
implementation
,
number theory
1500
x8851
1732C1
Sheikh (Easy version)
binary search
,
bitmasks
,
greedy
,
two pointers
1800
x6060
1731D
Valiant's New Map
binary search
,
brute force
,
data structures
,
dp
,
two pointers
1700
x7324
1731C
Even Subarrays
bitmasks
,
brute force
,
hashing
,
math
,
number theory
1700
x9852
1730B
Meeting on the Line
binary search
,
geometry
,
greedy
,
implementation
,
math
,
ternary search
1600
x13165
1729E
Guess the Cycle Size
interactive
,
probabilities
1800
x7144
1728D
Letter Picking
constructive algorithms
,
dp
,
games
,
two pointers
1800
x7402
1728C
Digital Logarithm
data structures
,
greedy
,
sortings
1400
x16156
1725M
Moving Both Hands
dp
,
graphs
,
shortest paths
1800
x3212
1725H
Hot Black Hot White
constructive algorithms
,
math
1800
x2682
1725G
Garage
binary search
,
geometry
,
math
1500
x6011
1722G
Even-Odd XOR
bitmasks
,
constructive algorithms
,
greedy
1500
x11742
1722F
L-shapes
dfs and similar
,
implementation
1700
x7127
1722E
Counting Rectangles
brute force
,
data structures
,
dp
,
implementation
1600
x11222
1721D
Maximum AND
bitmasks
,
dfs and similar
,
divide and conquer
,
greedy
,
sortings
1800
x6788
1721C
Min-Max Array Transformation
binary search
,
greedy
,
two pointers
1400
x13545
1720D1
Xor-Subsequence (easy version)
bitmasks
,
brute force
,
dp
,
strings
,
trees
,
two pointers
1800
x6110
1719C
Fighting Tournament
binary search
,
data structures
,
implementation
,
two pointers
1400
x13427
1718A1
Burenka and Traditions (easy version)
dp
,
greedy
1800
x5882
1715C
Monoblock
combinatorics
,
data structures
,
implementation
,
math
1700
x8766
1714G
Path Prefixes
binary search
,
data structures
,
dfs and similar
,
trees
1700
x7780
1714E
Add Modulo 10
brute force
,
math
,
number theory
1400
x17183
1714D
Color with Occurrences
brute force
,
data structures
,
dp
,
greedy
,
strings
1600
x9265
1713D
Tournament Countdown
constructive algorithms
,
greedy
,
interactive
,
number theory
,
probabilities
1800
x5755
1710A
Color the Picture
constructive algorithms
,
greedy
,
math
1500
x11044
1709D
Rorororobot
binary search
,
data structures
,
greedy
,
math
1700
x8563
1709C
Recover an RBS
constructive algorithms
,
greedy
,
implementation
,
strings
1800
x8960
1707A
Doremy's IQ
binary search
,
constructive algorithms
,
greedy
,
implementation
1600
x13838
1706D1
Chopping Carrots (Easy Version)
binary search
,
brute force
,
constructive algorithms
,
greedy
,
number theory
1700
x7099
1706C
Qpwoeirut And The City
dp
,
flows
,
greedy
,
implementation
1400
x15115
1705D
Mark and Lightbulbs
combinatorics
,
constructive algorithms
,
greedy
,
math
,
sortings
1800
x6435
1705C
Mark and His Unfinished Essay
brute force
,
implementation
1400
x13498
1703G
Good Key, Bad Key
bitmasks
,
brute force
,
dp
,
greedy
,
math
1600
x11000
1702F
Equate Multisets
constructive algorithms
,
data structures
,
greedy
,
math
,
number theory
1700
x8537
1702E
Split Into Two Sets
dfs and similar
,
dsu
,
graphs
1600
x13749
1701C
Schedule Management
binary search
,
greedy
,
implementation
,
two pointers
1400
x17625
1700C
Helping the Nature
constructive algorithms
,
data structures
,
greedy
1700
x11101
1699C
The Third Problem
combinatorics
,
constructive algorithms
,
math
1700
x9921
1698D
Fixed Point Guessing
binary search
,
constructive algorithms
,
interactive
1600
x9671
1697C
awoo's Favorite Problem
binary search
,
constructive algorithms
,
data structures
,
greedy
,
implementation
,
strings
,
two pointers
1400
x14608
1696C
Fishingprince Plays With Array
constructive algorithms
,
greedy
,
implementation
,
math
1400
x11792
1695C
Zero Path
brute force
,
data structures
,
dp
,
graphs
,
greedy
,
shortest paths
1700
x11144
1693B
Fake Plastic Trees
dfs and similar
,
dp
,
greedy
,
trees
1700
x8662
1692H
Gambling
data structures
,
dp
,
greedy
,
math
1700
x7663
1692G
2^Sort
data structures
,
dp
,
sortings
,
two pointers
1400
x18589
1691D
Max GEQ Sum
binary search
,
constructive algorithms
,
data structures
,
divide and conquer
,
implementation
,
two pointers
1800
x5923
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