不知道什么原因REl

求大佬看看我丑陋的代码

#include<iostream>
#include<string>
#include<algorithm>
using namespace std;

struct node{
    string name,ganbu,is_xiprin;
    int average,statues,out_write;
    int position;
    int achieve = 0;

}a[100];

bool cmp(node &a,node &b) {
    if (a.achieve != b.achieve) return a.achieve > b.achieve;
    else return a.position < b.position;
}
int main()
{
    int n; cin>>n;
    int sum = 0;
    for(int i = 1;i<=n;i++)
    {
        cin>>a[i].name>>a[i].average>>a[i].statues>>a[i].ganbu>>a[i].is_xiprin>>a[i].out_write;
        a[i].position = i;
        if(a[i].average>80 && a[i].out_write>=1) a[i].achieve += 8000;
        if(a[i].average>85 && a[i].statues>80) a[i].achieve += 4000;
        if(a[i].average>90) a[i].achieve += 2000;
        if(a[i].is_xiprin=="Y"&&a[i].average>85) a[i].achieve += 1000;
        if(a[i].statues>80&& a[i].ganbu=="Y") a[i].achieve += 850;
        sum += a[i].achieve;
    }

    sort(a+1,a+n+1,cmp);

    cout<<a[1].name<<endl<<a[1].achieve<<endl<<sum<<endl;
    return 0;
}