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48--rotate-image.java
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48--rotate-image.java
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class Solution {
public void rotate(int[][] matrix) {
int left = 0, right = matrix.length - 1;
while (left < right) {
for (int i = 0; i < right - left; i++) {
int top = left, bottom = right;
// save topLeft value
int topLeft = matrix[top][left + i];
// move bottomLeft to topLeft
matrix[top][left + i] = matrix[bottom - i][left];
// move bottomRight to bottomLeft
matrix[bottom - i][left] = matrix[bottom][right - i];
// move topRight to bottomRight
matrix[bottom][right - i] = matrix[top + i][right];
// move topLeft to topRight
matrix[top + i][right] = topLeft;
}
left++;
right--;
}
}
} // TC: O(M), SC: O(1)
/*
L R
[[5, 1, 9, 11] T
[2, 4, 8, 10]
[13, 3, 6, 7 ]
[15, 14, 12, 16]] B
*/