为什么测试点二和五WA了呢

#include <bits/stdc++.h>
#include <cstdio>
using namespace std;
int n,s;//苹果数、力气
int chair, hand;
int court=0;
int number(int p[10010], int q[10010]);
int high[10010],F[10010];

int main() {
    scanf("%d%d\n", &n, &s);
    scanf("%d%d\n", &chair, &hand);
    for(int i=1;i<=n;i++)
    {
        cin>>high[i]>>F[i];
    }
    printf("%d\n",number(high,F));
    return 0;
}
int number(int p[10010], int q[10010])
{
    int f[n];
    int fn = 0;
    int sum = 0;
    for(int i=1;i<=n;i++)
    {
        if(hand + chair >= p[i])
        {
            f[fn] = q[i];
            fn++;
        }
    }
    for(int i = 1;i<fn;i++)
    {
        for (int j = 1; j <= fn - i; j++)
        {
            if (f[j] > f[j + 1]) {
                int t = f[j];
                f[j] = f[j + 1];
                f[j + 1] = t;
            }
        }
    }
    for(int i = 1;i<=fn;i++)
    {
        sum += f[i];
        if(sum>s) break;
        else court++;
    }
    return court;
}