# Leetcode Python

## Easy Level

- **1. Two Sum** https://leetcode.com/problems/two-sum/
- **9. Palindrome Number** https://leetcode.com/problems/palindrome-number/
- **14. Longest Common Prefix** https://leetcode.com/problems/longest-common-prefix/
- **20. Valid Parentheses** https://leetcode.com/problems/valid-parentheses/
- **27. Remove Element** https://leetcode.com/problems/remove-element/
- **35. Search Insert Position** https://leetcode.com/problems/search-insert-position/
- **58. Length of Last Word** https://leetcode.com/problems/length-of-last-word/
- **69. Sqrt(x)** https://leetcode.com/problems/sqrtx/
- **118. Pascal's Triangle** https://leetcode.com/problems/pascals-triangle/
- **202. Happy Number** https://leetcode.com/problems/happy-number/
- **217. Contains Duplicate** https://leetcode.com/problems/contains-duplicate/
- **219. Contains Duplicate II** https://leetcode.com/problems/contains-duplicate-ii/
- **461. Hamming Distance** https://leetcode.com/problems/hamming-distance/
- See also some distance metrics: [Euclidean distance](https://en.wikipedia.org/wiki/Euclidean_distance), [Manhattan distance](https://en.wikipedia.org/wiki/Taxicab_geometry), and [Hamming distance](https://en.wikipedia.org/wiki/Hamming_distance).
- **509. Fibonacci Number** https://leetcode.com/problems/fibonacci-number/
- **674. Longest Continuous Increasing Subsequence** https://leetcode.com/problems/longest-continuous-increasing-subsequence/
- **704. Binary Search** https://leetcode.com/problems/binary-search/

## Medium Level
- **17. Letter Combinations of a Phone Number** https://leetcode.com/problems/letter-combinations-of-a-phone-number/
- **22. Generate Parentheses** https://leetcode.com/problems/generate-parentheses
- **34. Find First and Last Position of Element in Sorted Array** https://leetcode.com/problems/find-first-and-last-position-of-element-in-sorted-array/
- **39. Combination Sum** https://leetcode.com/problems/combination-sum/
- **40. Combination Sum II** https://leetcode.com/problems/combination-sum-ii/
- **46. Permutations** https://leetcode.com/problems/permutations/
- **47. Permutations II** https://leetcode.com/problems/permutations-ii/
- **50. Pow(x, n)** https://leetcode.com/problems/powx-n/
- **78. Subsets** https://leetcode.com/problems/subsets/
- **93. Restore IP Addresses** https://leetcode.com/problems/restore-ip-addresses/
- **215. Kth Largest Element in an Array** https://leetcode.com/problems/kth-largest-element-in-an-array/

## Hard Level
<img src = "https://hackmd.io/_uploads/BJ2zd9Pk2.png" height = 200px style="float:right"/>

- **51. N-Queens** https://leetcode.com/problems/n-queens/
- **52. N-Queens II** https://leetcode.com/problems/n-queens-ii/