1. Two Sum
https://leetcode.com/problems/two-sum
https://leetcode.com/problems/two-sum
https://leetcode.com/problems/same-tree
https://leetcode.com/problems/symmetric-tree/
Python
https://leetcode.com/problems/remove-all-adjacent-duplicates-in-string/
https://leetcode.com/problems/fixed-point/
https://leetcode.com/problems/populating-next-right-pointers-in-each-node
https://leetcode.com/problems/best-time-to-buy-and-sell-stock
https://leetcode.com/problems/best-time-to-buy-and-sell-stock-ii
https://leetcode.com/problems/count-negative-numbers-in-a-sorted-matrix/
https://leetcode.com/problems/shuffle-the-array/
https://leetcode.com/problems/two-sum-ii-input-array-is-sorted
Python
https://leetcode.com/problems/excel-sheet-column-number/
https://leetcode.com/problems/find-the-highest-altitude
https://leetcode.com/problems/sign-of-the-product-of-an-array/
https://leetcode.com/problems/house-robber
https://leetcode.com/problems/reverse-linked-list
https://leetcode.com/problems/maximum-running-time-of-n-computers/
https://leetcode.com/problems/contains-duplicate
https://leetcode.com/problems/rectangle-area/
https://leetcode.com/problems/swap-nodes-in-pairs
https://leetcode.com/problems/first-bad-version/
https://leetcode.com/problems/intersection-of-two-arrays
https://leetcode.com/problems/search-insert-position
https://leetcode.com/problems/find-the-difference/submissions/
https://leetcode.com/problems/maximum-subarray
https://leetcode.com/problems/merge-two-binary-trees/
https://leetcode.com/problems/unique-paths/
https://leetcode.com/problems/binary-search/
https://leetcode.com/problems/remove-duplicates-from-sorted-list-ii/
https://leetcode.com/problems/remove-duplicates-from-sorted-list/
https://leetcode.com/problems/backspace-string-compare/
https://leetcode.com/problems/validate-stack-sequences/
Python
https://leetcode.com/problems/largest-perimeter-triangle/