Leetcode shit

Question 1

Contains Duplication

Hint: use hashset

Answer 1

https://leetcode.com/problems/contains-duplicate/submissions/954800667/

Question 2

Two Sum

Hint: use dictionary

Answer 2

https://leetcode.com/problems/two-sum/submissions/954907152/

Question 3

Valid Anagram

hint: use frequency pattern

Answer 3

https://leetcode.com/submissions/detail/955391024/

Question 4

Shuffle Array

Answer 4

https://leetcode.com/submissions/detail/955404016/

Question 5

Palindrome

hint: use two pointers pattern

Answer 5

https://leetcode.com/problems/valid-palindrome/

Question 6

Best Time to Buy and Sell Stock

hint two pointers

Answer 6

https://leetcode.com/problems/best-time-to-buy-and-sell-stock/submissions/959323515/

Question 7

Binary Search

Answer 7

https://leetcode.com/problems/binary-search/submissions/959499892/

Question 8

maximum subarray

Answer 8

https://leetcode.com/problems/maximum-subarray/submissions/980561229/

Question 9

sliding window (fixed)