java算法题解牛客BM99顺时针旋转矩阵示例

import java.util.*;
public class Solution {
	public int[][] rotateMatrix(int[][] mat, int n) {
		int[][] res = new int[n][n]; //辅助数组
		for (int i = 0; i < res.length; i++) {
			for (int j = 0; j < res.length; j++) {
				res[j][n-i-1] = mat[i][j];
			}
		}
		return res;
	}
}

import java.util.*;
public class Solution {
	public int[][] rotateMatrix(int[][] mat, int n) {
		//按照做左对角线翻转数组
		for (int i = 0; i < mat.length; i++) {
			for (int j = i; j < mat.length; j++) {
				int temp = mat[i][j];
				mat[i][j] = mat[j][i];
				mat[j][i] = temp;
			}
		}
		//再按照列的中轴线翻转数组
		for (int i = 0; i < mat.length / 2; i++) {
			for (int j = 0; j < mat.length; j++) {
				int temp = mat[j][i];
				mat[j][i] = mat[j][n - i - 1];
				mat[j][n - i - 1] = temp;
			}
		}
		return mat;
	}
}