[LeetCode 100] Same Tree [Java]

1. Description Given two binary trees, write a function to check if they are the same or not. Two binary trees are considered the same if they are ...

[LeetCode 88] Merge Sorted Array [Java]

1. Description Given two sorted integer arrays nums1 and nums2, merge nums2 into nums1 as one sorted array. Note: You may assume that nums1 has eno...

[LeetCode 79] Word Search [Java]

1. Description Given a 2D board and a word, find if the word exists in the grid. The word can be constructed from letters of sequentially adjacent ...

[LeetCode 78] Subsets [Java]

1. Description Given a set of distinct integers, nums, return all possible subsets (the power set). Note: The solution set must not contain duplica...

[LeetCode 77] Combinations [Java]

1. Description Given two integers n and k, return all possible combinations of k numbers out of 1 ... n. 2. Example If n = 4 and k = 2, a soluti...

[LeetCode 83] Remove Duplicates from Sorted List [Java]

1. Description Given a sorted linked list, delete all duplicates such that each element appear only once. 2. Example Given 1->1->2, return 1->2....

[LeetCode 71] Simplify Path [Java]

1. Description Given an absolute path for a file (Unix-style), simplify it. 2. Example path = "/home/", => "/home" path = "/a/./b/../../c/", =...

[LeetCode 67] Add Binary [Java]

1. Description Given two binary strings, return their sum (also a binary string). 2. Example a = "11" b = "1" Return "100". 3.Code public c...

[LeetCode 66] Plus One [Java]

1. Description Given a non-negative integer represented as a non-empty array of digits, plus one to the integer. You may assume the integer do not ...

[LeetCode 65] Valid Number [Java]

1. Description Validate if a given string is numeric. Note: It is intended for the problem statement to be ambiguous. You should gather all require...