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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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number theory
probabilities
schedules
shortest paths
sortings
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ternary search
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two pointers
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Name
381A
Sereja and Dima
greedy
,
implementation
,
two pointers
800
x60455
279B
Books
binary search
,
brute force
,
implementation
,
two pointers
1400
x47820
489B
BerSU Ball
dfs and similar
,
dp
,
graph matchings
,
greedy
,
sortings
,
two pointers
1200
x46567
1791C
Prepend and Append
implementation
,
two pointers
800
x40619
1462A
Favorite Sequence
implementation
,
two pointers
800
x39999
1343C
Alternating Subsequence
dp
,
greedy
,
two pointers
1200
x36375
466C
Number of Ways
binary search
,
brute force
,
data structures
,
dp
,
two pointers
1700
x34601
1843A
Sasha and Array Coloring
greedy
,
sortings
,
two pointers
800
x32981
1873D
1D Eraser
greedy
,
implementation
,
two pointers
800
x32712
1840A
Cipher Shifer
implementation
,
strings
,
two pointers
800
x32597
1354B
Ternary String
binary search
,
dp
,
implementation
,
two pointers
1200
x29142
1851B
Parity Sort
greedy
,
sortings
,
two pointers
800
x28079
1843B
Long Long
greedy
,
math
,
two pointers
800
x28043
1399C
Boats Competition
brute force
,
greedy
,
two pointers
1200
x27774
600B
Queries about less or equal elements
binary search
,
data structures
,
sortings
,
two pointers
1300
x27477
1359B
New Theatre Square
brute force
,
dp
,
greedy
,
implementation
,
two pointers
1000
x27072
1538C
Number of Pairs
binary search
,
data structures
,
math
,
two pointers
1300
x27016
1690D
Black and White Stripe
implementation
,
two pointers
1000
x26825
1364A
XXXXX
brute force
,
data structures
,
number theory
,
two pointers
1200
x26795
1324D
Pair of Topics
binary search
,
data structures
,
sortings
,
two pointers
1400
x26766
580B
Kefa and Company
binary search
,
sortings
,
two pointers
1500
x24945
1840C
Ski Resort
combinatorics
,
math
,
two pointers
1000
x24623
978C
Letters
binary search
,
implementation
,
two pointers
1000
x24391
1744C
Traffic Light
binary search
,
implementation
,
two pointers
1000
x24261
1669F
Eating Candies
binary search
,
data structures
,
greedy
,
two pointers
1100
x23104
1760D
Challenging Valleys
implementation
,
two pointers
1000
x22397
1374D
Zero Remainder Array
math
,
sortings
,
two pointers
1400
x22213
1547C
Pair Programming
greedy
,
two pointers
1100
x22029
1968B
Prefiquence
greedy
,
two pointers
800
x21470
1133C
Balanced Team
sortings
,
two pointers
1200
x21321
1691B
Shoe Shuffling
constructive algorithms
,
greedy
,
implementation
,
two pointers
1000
x21274
1470A
Strange Birthday Party
binary search
,
dp
,
greedy
,
sortings
,
two pointers
1300
x21255
1646B
Quality vs Quantity
brute force
,
constructive algorithms
,
greedy
,
sortings
,
two pointers
800
x20868
1006C
Three Parts of the Array
binary search
,
data structures
,
two pointers
1200
x20284
1598C
Delete Two Elements
data structures
,
dp
,
implementation
,
math
,
two pointers
1200
x20044
1921D
Very Different Array
data structures
,
greedy
,
sortings
,
two pointers
1100
x19969
1692E
Binary Deque
binary search
,
implementation
,
two pointers
1200
x19964
1832B
Maximum Sum
brute force
,
sortings
,
two pointers
1100
x19647
1366B
Shuffle
math
,
two pointers
1300
x19601
1352E
Special Elements
brute force
,
implementation
,
two pointers
1500
x19345
961B
Lecture Sleep
data structures
,
dp
,
implementation
,
two pointers
1200
x19251
1847B
Hamon Odyssey
bitmasks
,
greedy
,
two pointers
1000
x19097
1369C
RationalLee
greedy
,
math
,
sortings
,
two pointers
1400
x19058
1729D
Friends and the Restaurant
greedy
,
sortings
,
two pointers
1200
x18848
1251A
Broken Keyboard
brute force
,
strings
,
two pointers
1000
x18817
1364B
Most socially-distanced subsequence
greedy
,
two pointers
1300
x18443
1389C
Good String
brute force
,
dp
,
greedy
,
two pointers
1500
x18375
1927D
Find the Different Ones!
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
two pointers
1300
x18252
1793C
Dora and Search
constructive algorithms
,
data structures
,
two pointers
1200
x18137
676C
Vasya and String
binary search
,
dp
,
strings
,
two pointers
1500
x18135
1899C
Yarik and Array
dp
,
greedy
,
two pointers
1100
x18131
1656B
Subtract Operation
data structures
,
greedy
,
math
,
two pointers
1100
x17662
1827A
Counting Orders
combinatorics
,
math
,
sortings
,
two pointers
1100
x17481
1741C
Minimize the Thickness
brute force
,
greedy
,
math
,
two pointers
1100
x17203
1746B
Rebellion
constructive algorithms
,
greedy
,
two pointers
800
x16754
251A
Points on Line
binary search
,
combinatorics
,
two pointers
1300
x16598
1689A
Lex String
brute force
,
greedy
,
implementation
,
sortings
,
two pointers
800
x16380
1535C
Unstable String
binary search
,
dp
,
greedy
,
implementation
,
strings
,
two pointers
1400
x16092
1692G
2^Sort
data structures
,
dp
,
sortings
,
two pointers
1400
x15947
1676F
Longest Strike
data structures
,
greedy
,
implementation
,
sortings
,
two pointers
1300
x15853
1789B
Serval and Inversion Magic
brute force
,
implementation
,
strings
,
two pointers
800
x15791
1304C
Air Conditioner
dp
,
greedy
,
implementation
,
sortings
,
two pointers
1500
x15772
1701C
Schedule Management
binary search
,
greedy
,
implementation
,
two pointers
1400
x15763
1257C
Dominated Subarray
greedy
,
implementation
,
sortings
,
strings
,
two pointers
1200
x15597
1492C
Maximum width
binary search
,
data structures
,
dp
,
greedy
,
two pointers
1500
x15577
1972A
Contest Proposal
brute force
,
greedy
,
two pointers
800
x15395
1928B
Equalize
binary search
,
greedy
,
sortings
,
two pointers
1200
x15260
1628A
Meximum Array
binary search
,
constructive algorithms
,
greedy
,
implementation
,
math
,
two pointers
1400
x15206
1610B
Kalindrome Array
greedy
,
two pointers
1100
x14790
1419D2
Sage's Birthday (hard version)
binary search
,
brute force
,
constructive algorithms
,
greedy
,
sortings
,
two pointers
1500
x14748
1237B
Balanced Tunnel
data structures
,
sortings
,
two pointers
1300
x14730
1519D
Maximum Sum of Products
brute force
,
dp
,
implementation
,
math
,
two pointers
1600
x14592
1736C1
Good Subarrays (Easy Version)
binary search
,
data structures
,
schedules
,
two pointers
1300
x14519
1690E
Price Maximization
binary search
,
greedy
,
math
,
two pointers
1500
x14508
1582C
Grandma Capa Knits a Scarf
brute force
,
data structures
,
greedy
,
strings
,
two pointers
1200
x14410
1697C
awoo's Favorite Problem
binary search
,
constructive algorithms
,
data structures
,
greedy
,
implementation
,
strings
,
two pointers
1400
x13940
1547E
Air Conditioners
data structures
,
dp
,
implementation
,
shortest paths
,
sortings
,
two pointers
1500
x13850
1873F
Money Trees
binary search
,
greedy
,
math
,
two pointers
1300
x13847
701C
They Are Everywhere
binary search
,
strings
,
two pointers
1500
x13767
1932C
LR-remainders
brute force
,
data structures
,
implementation
,
math
,
two pointers
1400
x13660
1820B
JoJo's Incredible Adventures
math
,
strings
,
two pointers
1100
x13394
1896B
AB Flipping
greedy
,
strings
,
two pointers
900
x13374
1553D
Backspace
dp
,
greedy
,
strings
,
two pointers
1500
x13340
1792C
Min Max Sort
binary search
,
brute force
,
greedy
,
math
,
two pointers
1500
x13225
1462E1
Close Tuples (easy version)
binary search
,
combinatorics
,
math
,
sortings
,
two pointers
1500
x13195
702C
Cellular Network
binary search
,
implementation
,
two pointers
1500
x13155
6C
Alice, Bob and Chocolate
greedy
,
two pointers
1200
x13011
1721C
Min-Max Array Transformation
binary search
,
greedy
,
two pointers
1400
x12972
427C
Checkposts
dfs and similar
,
graphs
,
two pointers
1700
x12959
1719C
Fighting Tournament
binary search
,
data structures
,
implementation
,
two pointers
1400
x12864
1771B
Hossam and Friends
binary search
,
constructive algorithms
,
dp
,
two pointers
1400
x12846
1904B
Collecting Game
binary search
,
dp
,
greedy
,
sortings
,
two pointers
1100
x12830
1381A2
Prefix Flip (Hard Version)
constructive algorithms
,
data structures
,
implementation
,
strings
,
two pointers
1700
x12755
1955D
Inaccurate Subsequence Search
data structures
,
two pointers
1400
x12710
86D
Powerful array
data structures
,
implementation
,
math
,
two pointers
2200
x12535
1794C
Scoring Subsequences
binary search
,
greedy
,
math
,
two pointers
1300
x12464
1927E
Klever Permutation
constructive algorithms
,
math
,
two pointers
1400
x12396
372A
Counting Kangaroos is Fun
binary search
,
greedy
,
sortings
,
two pointers
1600
x12369
1265B
Beautiful Numbers
data structures
,
implementation
,
math
,
two pointers
1300
x12300
1537E1
Erase and Extend (Easy Version)
binary search
,
brute force
,
dp
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
,
two pointers
1600
x12264
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