90分，哪里错了？？？找了半天

#include <bits/stdc++.h>
using namespace std ;

int n ;

struct student
{
	string name ;
	int english , chinese , math , num , id ;
} ;

student a[1005] ;

bool cmp( student a , student b )
{
	return a.num > b.num ;
}

int main()
{
	cin >> n ;
	for( int i = 1 ; i <= n ; i ++ )
	{
		cin >> a[i].name >> a[i].chinese >> a[i].math >> a[i].english ;
		a[i].num = a[i].chinese + a[i].math + a[i].english ;
		a[i].id = i ;
	}
	sort( a + 1 , a + n + 1 , cmp ) ;
	cout << a[1].name << " " << a[1].chinese << " " << a[1].math << " " << a[1].english ;
	return 0 ;
 }