原创 LeetCode.189 Rotate Array
Given an array, rotate the array to the right by k steps, where k is non-negative. Example 1: Input: [1,2,3,4,5,6,7] a
2018-09-05 23:52:16
原创 136. Single Number
Given a non-empty array of integers, every element appears twice except for one. Find that single one. Note: Your algor
2018-08-28 01:01:42
原创 LeetCode 107.Binary Tree Level Order Traversal II
Given a binary tree, return the bottom-up level order traversal of its nodes' values. (ie, from left to right, level by
2018-08-28 01:01:42
原创 LeetCode 101. Symmetric Tree (對稱二叉樹) 108. Convert Sorted Array To BST(二叉搜索樹)
101. Symmetric Tree (對稱二叉樹) Given a binary tree, check whether it is a mirror of itself (ie, symmetric around its cente
2018-08-28 01:01:42
原创 LeetCode 110 Balanced Binary Tree
Given a binary tree, determine if it is height-balanced. For this problem, a height-balanced binary tree is defined as:
2018-08-28 01:01:42
原创 LeetCode 112. Path Sum
Given a binary tree and a sum, determine if the tree has a root-to-leaf path such that adding up all the values along t
2018-08-28 01:01:42
原创 LeetCode-69 Sqrt(x)
Implement int sqrt(int x). Compute and return the square root of x, where x is guaranteed to be a non-negative integer.
2018-08-28 01:01:42
原创 java學習隨筆
eclipse 的一些快捷鍵： ctrl+1 快捷修復 ctrl+d 快捷刪除行 shift+enter 換行 ctrl+f11 快速運行項目 alt+↑/↓ 快速移動行 ctrl+m 放大工作區 ctrl+shift+r：打開資源 ct
2018-08-28 01:01:42
原创 121. Best Time to Buy and Sell Stock
Say you have an array for which the ith element is the price of a given stock on day i. If you were only permitted to c
2018-08-28 01:01:42
原创 LeetCode 88 Merge Sorted Array
Given two sorted integer arrays nums1 and nums2, merge nums2 into nums1 as one sorted array. Note: The number of elemen
2018-08-28 01:01:42
原创 125 Valid Palindrome
Given a string, determine if it is a palindrome, considering only alphanumeric characters and ignoring cases. Note: For
2018-08-28 01:01:42
原创 C++與STL入門
今天學的一點C++知識 1.c++版本框架： c++頭文件： stdio.h -> cstdio string -> cstring math.h -> cmath ctype.h -> cctype c++ 程序 加
2018-08-28 01:01:42
原创 LeetCode - Same Tree 100
Given two binary trees, write a function to check if they are the same or not. Two binary trees are considered the same
2018-08-28 01:01:41
原创 LeetCode 111. Minimum Depth of Binary
Given a binary tree, find its minimum depth. The minimum depth is the number of nodes along the shortest path from the
2018-08-28 01:01:41
原创 LeetCode 67 - Add Binary
Given two binary strings, return their sum (also a binary string). The input strings are both non-empty and contains on
2018-08-28 01:01:41