大佬救救，一个下午一直卡在90不过，我到底错哪了！！

#include<iostream>
#include<cstring>
using namespace std;
typedef struct stu{
    string name;
    int score[3];
    int sum=0;
    struct stu* next;
}*Std,stu;
int Init(Std& L);
int Init(Std& L)
{
    L = new stu;
    if (!L)
        exit(0);
    L->next = NULL;
    return 1;
}
int input(Std &L, int n)
{
    Std p1=new stu, p2=L;
    if (!p1) exit(0);
    for (int i = 0; i < n; i++)
    {
        cin >> p1->name;
        for (int j = 0; j < 3; j++)
        {
            cin >> p1->score[j];
            p1->sum += p1->score[j];
        }
        p2->next = p1;
        p2 = p1;
        p2->next = NULL;
        p1 = new stu;
    }
    return 1;
}
stu compare(Std &L, int n)
{
    stu max;
    Std p1 = L->next;
    max.name=p1->name;
    max.score[0] = p1->score[0];
    max.score[1] = p1->score[1];
    max.score[2] = p1->score[2];
    max.sum = 0;
    p1 = p1->next;
    int i =1;
    while (i<n)
    {
        if(p1->sum > max.sum)
        {
            max.sum = p1->sum;
            for(int j=0;j<3;j++)
            max.score[j] = p1->score[j];
            max.name = p1->name;
        }
        i++;
        p1 = p1->next;
    }
    return max;
}
int main()
{
    Std L; int n; stu max;
    cin >> n;
    Init(L);
    input(L, n);
    max=compare(L, n);
    cout << max.name << ' ' << max.score[0]<<' '<< max.score[1]<<' '<< max.score[2];
    return 0;
}

救命，过不了90；测试点7一直过不了