CODE EXAMPLE FOR CPP

rotate matrix by 90 degrees

class Solution 
{
    public void rotateBy90(int [][]mat) 
    {
        // Your code here
      var n = mat[0].length;
      var l = matrixTranspose(mat,n);
      
      for(var i=0;i<n;i++)
      {
        for(var j=n-1;j>=0;j--)
        {
          System.out.print(l[i][j]+" ");
      	}
        System.out.println();
      }
    }   
		public int[][] matrixTranspose(int[][] mat, int n) 
    {
       //Write your code here
      var b = new boolean[n][n];
      for(var i=0;i<n;i++)
      {
        for(var j=0; j<n; j++)
        {
          if(!b[i][i])
          {
            	var t = mat[i][j];
            	mat[i][j] = mat[j][i];
             	mat[j][i] =t;
            	b[i][j] = true;
           		b[j][i]=true;
          }
        }
      }
      return mat;
		}
}