View Code of Problem 51

#include<stdio.h>
int main(){
int n,i,j,sum=0;
int str[10][10];
scanf("%d",&n);
for(i=0;i<n;i++){
    for(j=0;j<n;j++){
        scanf("%d",&str[i][j]);
        if(i>=j)
            sum+=str[i][j];
    }
}
printf("%d",sum);
return 0;
}