今天我脑袋更浆糊似的，敲了一串神秘代码：

#include <bits/stdc++.h>

using namespace std;

#define int long long

const int N = 1e5 + 2;

int n, m;
int a[N], b[N];

// 这个judge 写的是什么玩意儿！
bool judge(int x) {
    if (x == 0 || x == 1) return 0;
    if (x == 2) return 1;
    for (int i = 2; i * i <= n; i++) 
        if (n % i) return 0;
    return 1;
}

signed main() {
    ios::sync_with_stdio(0);
    cin.tie(0), cout.tie(0);

    int T;
    cin >> T;
    while (T--) {
        cin >> n >> m;
        map<int, int> mm;
        for (int i = 1, x; i <= n; i++) {
            cin >> x;
            if (x == 1) continue;
            mm[x]++;
        }
        for (int i = 1, x; i <= m; i++) {
            cin >> x;
            if (x == 1) continue;
            mm[x]--;
        }
        int tot = 0, mark = 0;
        for (auto t : mm) {
            if (t.second != 0) mark = t.first, tot += t.second;
            if (tot > 1) {
                cout << "NO\n";
                goto loto;
            }
        }
        cout << (judge(mark) ? "YES\n" : "NO\n");
        loto:;
    }
    return 0;
}

结果，令我没想到的是，它竟然拿了 $69$ 分！