为什么错了

哪位大佬可以帮我纠错
我直接把AI给带偏了
@Eucatastrophe‌

#include <bits/stdc++.h>
using namespace std;
const int N = 200010;
long long h[N],a[N],b[N];
int main()
{
    long long n,s,L;
    cin >> n >> s >> L;
    for(int i = 1;i <= n;i++)
    {
        cin >> h[i];
    }
    for(int i = 1;i <= n;i++)
    {
        cin >> a[i];
    }
    long long ans = 1e18;
    long long l = 0,r = 1e18;
    while(l <= r)
    {
        long long mid = (l+r)/2;
        for(int i = 1;i <= n;i++)
        {
            long long now = h[i]+a[i]*mid;
            b[i] = now;
        }
        long long sum = 0;
        sort(b+1,b+n+1);
        for(int i = n;i >= 1;i++)
        {
            if(b[i] < L)
            {
                break;
            }
            sum += b[i];
            if(sum >= s)
            {
                break;
            }
        }
        if(sum >= s)
        {
            ans=min(ans,mid);
            r = mid-1;
        }
        else l = mid + 1;
    }
    cout << ans;
}