wap to store data of sparse matrix efficiently.

#include<stdio.h>
main()
{
int arr[100][100],arr1[100][3],i,j,m,n,a=1,b=0;
printf("enter the no of columns and rows\n");
scanf("%d%d",&m,&n);
arr1[0][0]=m;arr1[0][1]=n;
printf("enter the elements of the matrix\n");
for(i=0;i<m;i++)
for(j=0;j<n;j++)
{
scanf("%d",&arr[i][j]);
if(arr[i][j]!=0)
{
arr1[a][b]=i;
arr1[a][b+1]=j;
arr1[a][b+2]=arr[i][j];
a++;
}
}
arr1[0][2]=a-1;
printf("the sparse matrix is as follows\n");
for(i=0;i<a;i++){
for(j=0;j<3;j++)
printf("%d\t",arr1[i][j]);
printf("\n");}
}