Print matrix in diagonal pattern

PROBLEM :
Given a matrix M of n*n size, the task is to complete the function which prints its elements in diagonal pattern as depicted below.


matrix-diagonal-traversal
Input:
The first line of input contains an integer denoting the no of test cases. Then T test cases follow. Each test case contains an integer N denoting the size of the square matrix. In the next line are N*N space separated values of the matrix M.

Output:
For each test case output will be the space separated values of the matrix elements in diagnol form.

Constraints:
1<=T<=100
1<=n<=20

Example(To be used only for expected output):
Input:
2
3
1 2 3 4 5 6 7 8 9
2
1 2 3 4
Output:
1 2 4 7 5 3 6 8 9
1 2 3 4

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SIMPLE c++ IMPLEMENTATION :
--------------------------------------------------------------------------------

/*You are required to complete this method */
void printMatrixDiagonal(int mat[MAX][MAX], int no)
{
     int i,j,k ;
     bool direction=true ;
   
     i=0 ;
     j=0 ;
   
     for(k=0;k<no*no;)
     {
         if(direction)
         {
             for(;i>=0&&j<no;i--,j++)
             {
                 cout<<mat[i][j]<<" " ;
                 k++ ;
             }
             if(i<0&&j<=no-1)
                i=0 ;
             if(j==no)
             {
                 i=i+2 ;
                 j-- ;
             }
         }
         else
         {
             for(;i<no&&j>=0;i++,j--)
             {
                 cout<<mat[i][j]<<" " ;
                 k++ ;
             }
             if(j<0&&i<=no-1)
                j=0 ;
             if(i==no)
             {
                 j=j+2 ;
                 i-- ;
             }
         }
         direction=!direction ;
     }
}


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