#include <stdio.h>
#include <stdlib.h>
#include <time.h>
int main()
{
int i,j,n,sum,a[30][30];
printf("n=");
srand(time(NULL));
scanf("%d",&n);
printf("Matrix:\n");
sum = 0;
for (i = 1; i <= n; i++)
{
for (j = 1; j<=n; j++)
{
a[i][j]=1+rand()%9;
printf("%d ",a[i][j]);
}
printf("\n");
}
printf("\n");
for (i=2;i<=n-1;i++)
{
for(j=1;j<=2*i-1;j++)
if(i!=j)
sum+=a[i*2-j][j];
a[i][i]=sum;
sum=0;
}
printf("Output matrix:\n");
for (i = 1; i <= n; i++)
{
for (j = 1; j <= n; j++)
printf("%d ", a[i][j]);
printf("\n");
}
return 0;
}
