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public class RotateImage {

// 耗时2ms

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

int n = matrix.length;

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

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

int t = matrix[i][j];

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

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

}

}

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

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

int t = matrix[i][j];

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

matrix[j][i] = t;

}

}

}

}