评测最后一个RE，其余全过，求大佬调试

#include <bits/stdc++.h>
using namespace std;
#define int long long

int a[40010], b[40010];
bool vis1[40010], vis2[40010];

signed main()
{
    int n;
    cin >> n;
    for(int i = 1; i <= n; i++)
        cin >> a[i];
    for(int i = 1; i <= n; i++)
    {
        cin >> b[i];
    }
    sort(a + 1, a + n + 1);
    sort(b + 1, b + n + 1);
    int maxn = 0;
    for(int i = 1; i <= n; i++)
    {
        for(int j = 1; j <= n; j++)
        {
            if(a[j] > b[i] && vis1[j] == false)
            {
                maxn++;
                vis1[j] = true;
                break;
            }
        }
    }
    cout << maxn << endl;
    return 0;
}