F M04 - Matrix Product Hacker Rank Answer

 Write a program that takes as input two matrices and prints their product. If it is not possible to multiply the two matrices simply print -1.

Each matrix as input is of the form :

followed by number of lines with no. of elements on each line

More info on matrix multiplication : https://en.wikipedia.org/wiki/Matrix_multiplication

Hint : you will need three nested for loops to achieve the goal

Sample Input 0

2 2
1 0
0 1
2 2
1 1
1 1

Sample Output 0

1 1
1 1

Source Code

#include<stdio.h>
int main()
{
    //your code here
    int n,m,p,q;
    scanf("%d%d",&n,&m);
    int mat1[n][m],mat2[p][q];
    int i,j,k,prod[n][q];
    for(i=0;i<n;i++)
    {
        for(j=0;j<m;j++)
        {
            scanf("%d",&mat1[i][j]);
        }
    }
    scanf("%d%d",&p,&q);
     for(i=0;i<p;i++)
    {
        for(j=0;j<q;j++)
        {
            scanf("%d",&mat2[i][j]);
        }
    }
    if(m!=p)
    {
        printf("-1");
    }
    
    else
    {
        for(i=0;i<n;i++)
        {
            for(j=0;j<q;j++)
            {
              for(k=0;k<p;k++)
              {
                  prod[i][j]=mat1[i][k]*mat2[k][j];
              }
              
            }
        }
        for (i=0;i<n;i++)
        {
            for(j=0;j<q;j++)
                printf("%d ", prod[i][j]);
            printf("\n");
        }
    }
   
    return 0;
}