View Code of Problem 51

#include<cstdio>
#include<cstdlib>
#include<cmath>
#include<cstring>
#include<iostream>
using namespace std;
int main(){
    int n,a[11][11];
    scanf("%d",&n);
    for(int i=0;i<n;i++){
    	for(int j=0;j<n;j++){
    		scanf("%d",&a[i][j]);
		}
	}
	int sum=0;
	 for(int i=0;i<n;i++){
	 	for(int j=0;j<=i;j++){
	 		sum+=a[i][j];
	 		
		 }
	 }
	 printf("%d\n",sum);

	return 0;
}