蒟蒻求助~40分~只有前两个测试点对了

还是二话不说上代码：

#include <iostream>
#include <algorithm>
#include <cstdlib>
#include <cstdio>
using namespace std;
struct aApple {
    int xi;
    int yi;
};
bool cmp(aApple a, aApple b)
{

    if (a.yi > b.yi)
    {
        return 0;
    } else if (a.yi < b.yi) {
        return 1;
    }

    if (a.xi > b.xi)
    {
        return 0;
    } else if (a.xi < b.xi) {
        return 1;
    }

    return 0;
}
int main()
{
    cout.sync_with_stdio(false);

    int n, s;
    int a, b;
    aApple ar[5001];

    cin >> n >> s;
    cin >> a >> b;

    int sum = 0;

    for (int i = 0; i < n-1; i++)
    {
        cin >> ar[i].xi >> ar[i].yi;
    }

    sort(ar, ar+n-1, cmp);

    //cout << "\n\n";

    //for (int i = 0; i < n-1; i++)
    //{
        //cout << ar[i].xi << " " << ar[i].yi << "\n";
    //}

    for (int i = 0; i < n-1; i++)
    {
        if (a+b > ar[i].xi && s >= ar[i].yi)
        {
            sum++;
            s-=ar[i].yi;
        }
    }

    cout << ++sum << endl;

    return 0;
}

跪求大佬相助~蟹蟹~