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package problems;

public class LeetCode48 {

// 辅助数组

public void rotate(int[][] matrix) {

int n=matrix.length;

int matrix_new[][]=new int[n][n];

for(int i=0;i<n;i++){

for(int j=0;j<n;j++){

matrix_new[j][n-i-1]=matrix[i][j];

}

}

for(int i=0;i<n;i++){

for(int j=0;j<n;j++){

matrix[i][j]=matrix_new[i][j];

}

}

}

// 原地旋转

public void rotate1(int[][] matrix) {

int n=matrix.length;

for(int i=0;i<n/2;++i){

for(int j=0;j<(n+1)/2;++j){

int temp=matrix[i][j];

matrix[i][j]=matrix[n-j-1][i];

matrix[n-j-1][i]=matrix[n-i-1][n-j-1];

matrix[n-i-1][n-j-1]=matrix[j][n-i-1];

matrix[j][n-i-1]=temp;

}

}

}

// 水平翻转 + 主对角线翻转

public void rotate2(int[][] matrix) {

int n = matrix.length;

// 水平翻转

for (int i = 0; i < n / 2; ++i) {

for (int j = 0; j < n; ++j) {

int temp = matrix[i][j];

matrix[i][j] = matrix[n - i - 1][j];

matrix[n - i - 1][j] = temp;

}

}

// 主对角线翻转

for (int i = 0; i < n; ++i) {

for (int j = 0; j < i; ++j) {

int temp = matrix[i][j];

matrix[i][j] = matrix[j][i];

matrix[j][i] = temp;

}

}

}

}