Add new Amazon SDE-1 questions from leetcode

See https://leetcode.com/discuss/interview-question/488887/amazon-final-interview-questions-sde1

```
* not required to solve
~ solve both iteratively and recursively
```

- [x] [Two Sum](../blob/master/00_Arrays/coupleSum) `Easy`
- [ ] Median of Two Sorted Arrays `*` ([#4](https://leetcode.com/problems/median-of-two-sorted-arrays/))
- [ ] Longest Palindromic Substring ([#5](https://leetcode.com/problems/longest-palindromic-substring/))
- [ ] String to Integer (atoi) ([#8](https://leetcode.com/problems/string-to-integer-atoi/))
- [ ] Integer to Roman ([#12](https://leetcode.com/problems/integer-to-roman/))
- [ ] Roman to Integer ([#13](https://leetcode.com/problems/roman-to-integer/))
- [ ] Valid Parentheses ([#20](https://leetcode.com/problems/valid-parentheses/))
- [ ] Merge K Sorted Lists ([#23](https://leetcode.com/problems/merge-k-sorted-lists/))
- [ ] Valid Sudoku ([#36](https://leetcode.com/problems/valid-sudoku/))
- [ ] Combination Sum ([#39](https://leetcode.com/problems/combination-sum/))
- [ ] Permutations ([#46](https://leetcode.com/problems/permutations/))
- [x] [Merge Intervals](../blob/master/00_Arrays/merge-intervals/) `Medium`
- [ ] Rotate List ([#61](https://leetcode.com/problems/rotate-list/))
- [ ] Word Search ([#79](https://leetcode.com/problems/word-search/))
- [ ] Validate Binary Search Tree([#98](https://leetcode.com/problems/validate-binary-search-tree/))
- [ ] Same Tree `~` ([#100](https://leetcode.com/problems/same-tree/))
- [ ] Symmetric Tree `~` ([#101](https://leetcode.com/problems/symmetric-tree/))
- [ ] Binary Tree Level Order Traversal ([#102](https://leetcode.com/problems/binary-tree-level-order-traversal/))
- [ ] Convert Sorted List to Binary Search Tree ([#109](https://leetcode.com/problems/convert-sorted-list-to-binary-search-tree/))
- [ ] Populating Next Right Pointers in Each Node ([#116](https://leetcode.com/problems/populating-next-right-pointers-in-each-node/))
- [x] [Best Time to Buy and Sell Stock](../blob/master/00_Arrays/best-time-to-buy-and-sell-stock) `Easy`
- [ ] Word Ladder II ([#126](https://leetcode.com/problems/word-ladder-ii/))
- [ ] Word Ladder ([#127](https://leetcode.com/problems/word-ladder/))
- [ ] LRU Cache ([#146](https://leetcode.com/problems/lru-cache/))
- [ ] Min Stack ([#155](https://leetcode.com/problems/min-stack/))
- [ ] Number of Islands ([#200](https://leetcode.com/problems/number-of-islands/))
- [ ] Course Schedule ([#207](https://leetcode.com/problems/course-schedule/))
- [ ] Course Schedule II ([#210](https://leetcode.com/problems/course-schedule-ii/))
- [ ] Integer to English Words ([#273](https://leetcode.com/problems/integer-to-english-words/))
- [ ] Game of Life ([#289](https://leetcode.com/problems/game-of-life/))
- [ ] Find Median from Data Stream ([#295](https://leetcode.com/problems/find-median-from-data-stream/))
- [ ] Longest Increasing Subsequence ([#300](https://leetcode.com/problems/longest-increasing-subsequence/))
- [ ] Design Tic-Tac-Toe ([#348](https://leetcode.com/problems/design-tic-tac-toe/))
- [ ] Pacific Atlantic Water Flow ([#417](https://leetcode.com/problems/pacific-atlantic-water-flow/))
- [ ] Minesweeper ([#529](https://leetcode.com/problems/minesweeper/))
- [ ] Diameter of Binary Tree ([#543](https://leetcode.com/problems/diameter-of-binary-tree/))
- [ ] Reorganize String ([#767](https://leetcode.com/problems/reorganize-string/))

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