48. Rotate Image - LeetCode

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48. Rotate Image - LeetCode

Question 48. Rotate Image Solution 把这个二维数组(矩阵)看成一个一个环,循环每个环,循环每条边,每个边上的点进行旋转 public void rotate(int[][] matrix) { int n = matrix.length; for (int i = 0; i < n / 2; i++) { change(matrix, i); } } private void change(int[][] matrix, int i) { int n = mat…

[Leetcode][Python]48: Rotate Image

# -*- coding: utf8 -*-'''__author__ = 'dabay.wang@gmail.com' 48: Rotate Imagehttps://leetcode.com/problems/rotate-image/ You are given an n x n 2D matrix representing an image.Rotate the image by 90 degrees (clockwise).Could you do this in-place? ===…

[array] leetcode - 48. Rotate Image - Medium

leetcode - 48. Rotate Image - Medium descrition You are given an n x n 2D matrix representing an image. Rotate the image by 90 degrees (clockwise). Note: You have to rotate the image in-place, which means you have to modify the input 2D matrix direct…

刷题48. Rotate Image

一.题目说明题目是48. Rotate Image,简而言之就是矩阵顺时针旋转90度.不允许使用额外的矩阵. 经过观察(写一个矩阵,多看几遍就知道了),旋转90度后: 第1行变为len-1列(最后一列),第i行变为 len-i-1列最终达到(i,j)-->(j,len-i-1) 知道规律后,做法就比较简单了,可以先上下行交换,再对角交换: (i,j)-->(len-i-1,j)-->(j,len-i-1) 也可以先对角交换,再左右列交换: (i,j)-->(j,i)-->(…

[LeetCode] 48. Rotate Image 旋转图像

You are given an n x n 2D matrix representing an image. Rotate the image by 90 degrees (clockwise). Note: You have to rotate the image in-place, which means you have to modify the input 2D matrix directly. DO NOT allocate another 2D matrix and do the…

LeetCode 48. Rotate Image（旋转图像）

You are given an n x n 2D matrix representing an image. Rotate the image by 90 degrees (clockwise). Follow up:Could you do this in-place? 题目标签:Array 这道题目给了我们一个n * n的矩阵,让我们旋转图片.题目要求in-place,所以就不能用额外的空间了.一开始自己写了一个很原始的方法,结果虽然通过,但是速度太慢.只好去看看别人的方法,看完觉得,自己…