View Code of Problem 51

#include <iostream>
#include <cmath>
#include <algorithm>
#include <cstdio>
#include <cstring>
using namespace std;
int main(){
    int n;
    scanf("%d",&n);
    int num[10][10];
    memset(num,0,sizeof(num));
    int sum=0;
    for(int i=0;i<n;i++){
        for(int j=0;j<n;j++){
            scanf("%d",&num[i][j]);
            if(j<=i){
                sum+=num[i][j];
            }
        }
    }
    printf("%d",sum);
    return 0;
}