(java)Rotate Image
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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?
思路:本题的题意就是把一个n*n的矩阵,顺时针转90度,先关于主对角线交换,再将列对称交换
比如
12345678910111213141516先关于对角线交换,变为15913261014371115481216再将列对称交换,得到结果13951141062151173161284代码如下(已通过leetcode)public class Solution {
public void rotate(int[][] matrix) {
int n=matrix.length;
int temp;
for(int i=0;i<n;i++) {
for(int j=0;j<i;j++) {
temp=matrix[i][j];
matrix[i][j]=matrix[j][i];
matrix[j][i]=temp;
}
}
int start;
int end;
for(int i=0;i<n;i++) {
start=0;
end=n-1;
while(start<end) {
temp=matrix[i][start];
matrix[i][start]=matrix[i][end];
matrix[i][end]=temp;
start++;
end--;
}
}
}
}
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