60求助QAQ！2，4点RE，不知道怎么改（哭

#include<cstdio>
#include<algorithm>
#include<set>
using namespace std;
struct info{
    int H,S;
}apple[5010];

bool cmp1(info a,info b)
{
    return a.H<b.H;
}
bool cmp2(info a,info b)
{
    return a.S<b.S;
}

int main()
{
    int n,i,s,a,b;
    scanf("%d%d%d%d",&n,&s,&a,&b);
    for(i=0;i<n;i++)
    {
        scanf("%d%d",&apple[i].H,&apple[i].S);
    }
    sort(apple,apple+n,cmp1);
    for(i=0;apple[i].H<=(a+b);i++);
    sort(apple,apple+i,cmp2);
    i=0;
    while(s>=0&&i<n)
    {
        s-=apple[i].S;
        i++;
    }
    printf("%d",i-1);
    return 0;
}