为什么80？求大神指点？

#include<iostream>
#include<cstring>
using namespace std;
int a[10000],b[10000],c[10000],s[10000],d[10000];
int main()
{
    int n;
    cin>>n;
    for(int i=1;i<=n;++i)
    {
        cin>>a[i]>>b[i]>>c[i];
        s[i]=a[i]+b[i]+c[i];
        d[i]=i;
    }
    for(int i=1;i<=n;++i)
      for(int j=1;j<=n-i;++j)
        if((s[j]<s[j+1])||(s[j]==s[j+1]&&a[j]<a[j+1])||(s[j]==s[j+1]&&a[j]==a[j+1]&&d[j]>d[j+1]))
          {
               int t=s[j];
               s[j]=s[j+1];
               s[j+1]=t;
               int t0=d[j];
               d[j]=d[j+1];
               d[j+1]=t0;
          } 
    for(int i=1;i<=5;++i)
      cout<<d[i]<<" "<<s[i]<<endl;
    return 0;
}