让文字在页面上90度，180度翻转(转)

层序遍历 /** * 二叉树的层序遍历 */ class QueueTraverse { /** * 存放一层一层的数据 */ public List<List<Integer>> resList = new ArrayList<>(); public List&l...

面试题 01.07. 旋转矩阵 给你一幅由 N × N 矩阵表示的图像，其中每个像素的大小为 4 字节。请你设计一种算法，将图像旋转 90 度。 不占用额外内存空间能否做到？ 示例 1: 给定 matrix = [ [1,2,3], [4,5,6]...

Given two integers n and k, find how many different arrays consist of numbers from 1 to n such that there are exactly k inverse pairs. We define an inve...

You are playing the following Flip Game with your friend: Given a string that contains only these two characters: + and -, you and your friend take turns to flip twoconsecutive ...

Write a function that reverses a string. The input string is given as an array of characters char[]. Do not allocate extra space for another array, you must do this by modifying the input...

Given a 32-bit signed integer, reverse digits of an integer. Example 1: Input: 123 Output: 321 Example 2: Input: -123 Output: -321 Example 3: Input: 120 Output: 21 Note:Assume we are dealing wit...

** 整数翻转** 以下程序把一个整数翻转（8765变为：5678），请补充缺少的代码。 int n = 8765; int m = 0; while(n>0) { m = ________________________; ...

假设我们的环境只能存储得下 32 位的有符号整数，则其数值范围为 [−231,  231 − 1]。请根据这个假设，如果反转后整数溢出那么就返回 0。 代码如下： int reverse(int x) { int ...