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two pointers
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
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probabilities
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shortest paths
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Name
381A
Sereja and Dima
greedy
,
implementation
,
two pointers
800
x60430
279B
Books
binary search
,
brute force
,
implementation
,
two pointers
1400
x47808
489B
BerSU Ball
dfs and similar
,
dp
,
graph matchings
,
greedy
,
sortings
,
two pointers
1200
x46551
1791C
Prepend and Append
implementation
,
two pointers
800
x40589
1462A
Favorite Sequence
implementation
,
two pointers
800
x39990
1343C
Alternating Subsequence
dp
,
greedy
,
two pointers
1200
x36366
466C
Number of Ways
binary search
,
brute force
,
data structures
,
dp
,
two pointers
1700
x34588
1843A
Sasha and Array Coloring
greedy
,
sortings
,
two pointers
800
x32975
1873D
1D Eraser
greedy
,
implementation
,
two pointers
800
x32670
1840A
Cipher Shifer
implementation
,
strings
,
two pointers
800
x32593
1354B
Ternary String
binary search
,
dp
,
implementation
,
two pointers
1200
x29137
1851B
Parity Sort
greedy
,
sortings
,
two pointers
800
x28069
1843B
Long Long
greedy
,
math
,
two pointers
800
x28042
1399C
Boats Competition
brute force
,
greedy
,
two pointers
1200
x27771
600B
Queries about less or equal elements
binary search
,
data structures
,
sortings
,
two pointers
1300
x27458
1359B
New Theatre Square
brute force
,
dp
,
greedy
,
implementation
,
two pointers
1000
x27069
1538C
Number of Pairs
binary search
,
data structures
,
math
,
two pointers
1300
x27007
1690D
Black and White Stripe
implementation
,
two pointers
1000
x26803
1364A
XXXXX
brute force
,
data structures
,
number theory
,
two pointers
1200
x26791
1324D
Pair of Topics
binary search
,
data structures
,
sortings
,
two pointers
1400
x26764
580B
Kefa and Company
binary search
,
sortings
,
two pointers
1500
x24943
1840C
Ski Resort
combinatorics
,
math
,
two pointers
1000
x24601
978C
Letters
binary search
,
implementation
,
two pointers
1000
x24388
1744C
Traffic Light
binary search
,
implementation
,
two pointers
1000
x24245
1669F
Eating Candies
binary search
,
data structures
,
greedy
,
two pointers
1100
x23094
1760D
Challenging Valleys
implementation
,
two pointers
1000
x22383
1374D
Zero Remainder Array
math
,
sortings
,
two pointers
1400
x22207
1547C
Pair Programming
greedy
,
two pointers
1100
x22029
1133C
Balanced Team
sortings
,
two pointers
1200
x21316
1691B
Shoe Shuffling
constructive algorithms
,
greedy
,
implementation
,
two pointers
1000
x21268
1470A
Strange Birthday Party
binary search
,
dp
,
greedy
,
sortings
,
two pointers
1300
x21252
1968B
Prefiquence
greedy
,
two pointers
800
x21178
1646B
Quality vs Quantity
brute force
,
constructive algorithms
,
greedy
,
sortings
,
two pointers
800
x20867
1006C
Three Parts of the Array
binary search
,
data structures
,
two pointers
1200
x20278
1598C
Delete Two Elements
data structures
,
dp
,
implementation
,
math
,
two pointers
1200
x20041
1921D
Very Different Array
data structures
,
greedy
,
sortings
,
two pointers
1100
x19959
1692E
Binary Deque
binary search
,
implementation
,
two pointers
1200
x19953
1832B
Maximum Sum
brute force
,
sortings
,
two pointers
1100
x19637
1366B
Shuffle
math
,
two pointers
1300
x19600
1352E
Special Elements
brute force
,
implementation
,
two pointers
1500
x19332
961B
Lecture Sleep
data structures
,
dp
,
implementation
,
two pointers
1200
x19243
1847B
Hamon Odyssey
bitmasks
,
greedy
,
two pointers
1000
x19091
1369C
RationalLee
greedy
,
math
,
sortings
,
two pointers
1400
x19057
1729D
Friends and the Restaurant
greedy
,
sortings
,
two pointers
1200
x18842
1251A
Broken Keyboard
brute force
,
strings
,
two pointers
1000
x18815
1364B
Most socially-distanced subsequence
greedy
,
two pointers
1300
x18439
1389C
Good String
brute force
,
dp
,
greedy
,
two pointers
1500
x18371
1927D
Find the Different Ones!
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
two pointers
1300
x18244
1793C
Dora and Search
constructive algorithms
,
data structures
,
two pointers
1200
x18131
676C
Vasya and String
binary search
,
dp
,
strings
,
two pointers
1500
x18130
1899C
Yarik and Array
dp
,
greedy
,
two pointers
1100
x18117
1656B
Subtract Operation
data structures
,
greedy
,
math
,
two pointers
1100
x17658
1827A
Counting Orders
combinatorics
,
math
,
sortings
,
two pointers
1100
x17473
1741C
Minimize the Thickness
brute force
,
greedy
,
math
,
two pointers
1100
x17203
1746B
Rebellion
constructive algorithms
,
greedy
,
two pointers
800
x16753
251A
Points on Line
binary search
,
combinatorics
,
two pointers
1300
x16597
1689A
Lex String
brute force
,
greedy
,
implementation
,
sortings
,
two pointers
800
x16380
1535C
Unstable String
binary search
,
dp
,
greedy
,
implementation
,
strings
,
two pointers
1400
x16087
1692G
2^Sort
data structures
,
dp
,
sortings
,
two pointers
1400
x15941
1676F
Longest Strike
data structures
,
greedy
,
implementation
,
sortings
,
two pointers
1300
x15846
1789B
Serval and Inversion Magic
brute force
,
implementation
,
strings
,
two pointers
800
x15789
1304C
Air Conditioner
dp
,
greedy
,
implementation
,
sortings
,
two pointers
1500
x15771
1701C
Schedule Management
binary search
,
greedy
,
implementation
,
two pointers
1400
x15752
1257C
Dominated Subarray
greedy
,
implementation
,
sortings
,
strings
,
two pointers
1200
x15595
1492C
Maximum width
binary search
,
data structures
,
dp
,
greedy
,
two pointers
1500
x15576
1928B
Equalize
binary search
,
greedy
,
sortings
,
two pointers
1200
x15248
1628A
Meximum Array
binary search
,
constructive algorithms
,
greedy
,
implementation
,
math
,
two pointers
1400
x15203
1972A
Contest Proposal
brute force
,
greedy
,
two pointers
800
x15131
1610B
Kalindrome Array
greedy
,
two pointers
1100
x14788
1419D2
Sage's Birthday (hard version)
binary search
,
brute force
,
constructive algorithms
,
greedy
,
sortings
,
two pointers
1500
x14745
1237B
Balanced Tunnel
data structures
,
sortings
,
two pointers
1300
x14727
1519D
Maximum Sum of Products
brute force
,
dp
,
implementation
,
math
,
two pointers
1600
x14586
1736C1
Good Subarrays (Easy Version)
binary search
,
data structures
,
schedules
,
two pointers
1300
x14513
1690E
Price Maximization
binary search
,
greedy
,
math
,
two pointers
1500
x14504
1582C
Grandma Capa Knits a Scarf
brute force
,
data structures
,
greedy
,
strings
,
two pointers
1200
x14398
1697C
awoo's Favorite Problem
binary search
,
constructive algorithms
,
data structures
,
greedy
,
implementation
,
strings
,
two pointers
1400
x13938
1547E
Air Conditioners
data structures
,
dp
,
implementation
,
shortest paths
,
sortings
,
two pointers
1500
x13848
1873F
Money Trees
binary search
,
greedy
,
math
,
two pointers
1300
x13833
701C
They Are Everywhere
binary search
,
strings
,
two pointers
1500
x13765
1932C
LR-remainders
brute force
,
data structures
,
implementation
,
math
,
two pointers
1400
x13645
1820B
JoJo's Incredible Adventures
math
,
strings
,
two pointers
1100
x13389
1896B
AB Flipping
greedy
,
strings
,
two pointers
900
x13366
1553D
Backspace
dp
,
greedy
,
strings
,
two pointers
1500
x13328
1792C
Min Max Sort
binary search
,
brute force
,
greedy
,
math
,
two pointers
1500
x13219
1462E1
Close Tuples (easy version)
binary search
,
combinatorics
,
math
,
sortings
,
two pointers
1500
x13195
702C
Cellular Network
binary search
,
implementation
,
two pointers
1500
x13152
6C
Alice, Bob and Chocolate
greedy
,
two pointers
1200
x13008
1721C
Min-Max Array Transformation
binary search
,
greedy
,
two pointers
1400
x12971
427C
Checkposts
dfs and similar
,
graphs
,
two pointers
1700
x12952
1719C
Fighting Tournament
binary search
,
data structures
,
implementation
,
two pointers
1400
x12863
1771B
Hossam and Friends
binary search
,
constructive algorithms
,
dp
,
two pointers
1400
x12842
1904B
Collecting Game
binary search
,
dp
,
greedy
,
sortings
,
two pointers
1100
x12823
1381A2
Prefix Flip (Hard Version)
constructive algorithms
,
data structures
,
implementation
,
strings
,
two pointers
1700
x12755
1955D
Inaccurate Subsequence Search
data structures
,
two pointers
1400
x12693
86D
Powerful array
data structures
,
implementation
,
math
,
two pointers
2200
x12528
1794C
Scoring Subsequences
binary search
,
greedy
,
math
,
two pointers
1300
x12464
1927E
Klever Permutation
constructive algorithms
,
math
,
two pointers
1400
x12390
372A
Counting Kangaroos is Fun
binary search
,
greedy
,
sortings
,
two pointers
1600
x12366
1265B
Beautiful Numbers
data structures
,
implementation
,
math
,
two pointers
1300
x12298
1537E1
Erase and Extend (Easy Version)
binary search
,
brute force
,
dp
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
,
two pointers
1600
x12260
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