大佬求助

#include<iostream>
#include<algorithm>
using namespace std;
//int yu[301],shu[301],ying[301],zong[301];
struct yers
{
    string name;
    int nian,yue,ri;
} a[110];
int main()
{
    int n;
    cin>>n;
    for(int i=0;i<n;i++)
    {
        cin>>a[i].name >>a[i].nian >>a[i].yue >>a[i].ri ;
    }
    for(int i=0;i<n;i++)
    {
        if(a[i].nian >a[i+1].nian )
        {
            swap(a[i].name ,a[i+1].name );
        }
        if(a[i].nian ==a[i+1].nian )
        {
            if(a[i].yue >a[i+1].yue )
            {
                swap(a[i].name ,a[i+1].name );
            }
            if(a[i].yue ==a[i+1].yue )
            {
                if(a[i].ri >a[i+1].ri )
                {
                    swap(a[i].name ,a[i+1].name );
                }
            }
        }
    }
    for(int i=n-1;i>=0;i--)
    {
        cout<<a[i].name<<"\n" ;
    }
}