My solutions for LeetCode problems

I add the solutions to the problems that are better than leetcode solution in execution time and those which there are no leetcode solutions.

1. Two Sum [easy, Hash Table]

14. Longest Common Prefix [easy, Binary search]

54. Spiral Matrix

• spiral_matrix_my.py (better)

70. Climbing Stairs [Recursion, Dynamic Programming, Fibonacci]

100. Same Tree [easy, Recursion]

101. Symmetric Tree [easy, Recursive, Iterative]

130. Surrounded Regions

• surrounded_regions_my.py

200. Number of Islands

• number_of_islands_my.py

226. Invert Binary Tree [easy, Recursive]

235. Lowest Common Ancestor of a Binary Search Tree [easy, Recursive, Iterative]

403. Frog Jump

• FrogJumpMy.java

509. Fibonacci Number [easy, Recursion]

538. Convert BST to Greater Tree [easy, Recursion, Stack, reverse Morris traversal]

563. Binary Tree Tilt [easy, Recursion]

572. Subtree of Another Tree [easy, Traversal]

617. Merge Two Binary Trees [easy, Recursion, Iterative]

637. Average of Levels in Binary Tree [easy, DFS, BFS]

653. Two Sum IV [easy, HashSet, BFS, BST]

669. Trim a Binary Search Tree [easy, Recursion]

671. Second Minimum Node In a Binary Tree [easy, DFS]

682. Baseball Game [easy, Stack]

687. Longest Univalue Path [easy, Recursion]

690. Employee Importance [easy, DFS]

696. Count Binary Substrings [easy, Linear Scan]

704. Binary Search [easy, Binary Search]

716. Max Stack [easy, TreeMap]

720. Longest Word In Dictionary [easy, DFS]

733. Flood Fill [easy, DFS]

744. Find Smallest Letter Greater Than Target [easy, Linear Scan, Binary Search]

749. Contain Virus

747. Largest Number At Least Twice of Others [easy, Linear Scan]

796. Rotate String [easy, KMP]

804. Unique Morse Code Words [easy, HashSet]

811. Subdomain Visit Count [easy, HashMap]

827. Making A Large Island [Hard, DFS]

852. Peak Index in a Mountain Array [easy, binary search]

872. Leaf-Similar Trees [easy, DFS]

872. Leaf-Similar Trees [easy, DFS]

897. Increasing Order Search Tree [medium, Traversal]

938. Range Sum of BST [easy, DFS]

965. Univalued Binary Tree [easy, DFS, Recursion]

993. Cousins in Binary Tree [easy, DFS]

994. Rotting Oranges [easy, BFS]

1222. Queens That Can Attack the King

• QueensThatCanAttackTheKingMy.java