蓝桥杯--答疑

https://www.lanqiao.cn/problems/1025/learning/?contest_id=55

#include<bits/stdc++.h>
using namespace std;
#include<cstdio>
int main()
{   int n;
    scanf("%d",&n);
    int s[n],a[n],e[n],sum[n];
    long long int ans=0;
    for(int i=0;i<n;i++)
        scanf("%d %d %d",&s[i],&a[i],&e[i]);
    for(int i=0;i<n;i++){
        sum[i]=s[i]+a[i]+e[i];
    }
        sort(sum,sum+n);
    for(int i=0;i<n;i++){
     ans=ans+((n-i)*sum[i]-e[i]);
    }
    printf("%lld",ans);
}