rotateMatrix function

void rotateMatrix(List<List<int>> matrix)

🔄 Matrix Rotation (90 degrees clockwise)

Rotates the given n x n matrix in-place.

Implementation

void rotateMatrix(List<List<int>> matrix) {
  final n = matrix.length;
  for (int i = 0; i < n ~/ 2; i++) {
    for (int j = i; j < n - i - 1; 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;
    }
  }
}