func_code_string: #include <bits/stdc++.h>   using namespace std;   using LL = long long;   const int maxn = 3000010;   int n, b;   int pre[maxn], vis[maxn];   vector<int> prime;   struct init {     init() {       memset(pre, 0, sizeof pre);       prime.clear();       for (int i = 2; i < maxn; i++) {         if (pre[i] == 0) {           pre[i] = i;           prime.emplace_back(i);         }         for (int j = 0; j < prime.size() && i * prime[j] < maxn; j++) {           if (prime[j] > pre[i]) break;           pre[i * prime[j]] = prime[j];         }       }     }   } init_;   bool ok(int x) {     if (x == 1) return 0;     return pre[x] == 0;   }   signed main() {     while (cin >> n) {       memset(vis, 0, sizeof vis);       for (int i = 1; i <= 2 * n; i++) {         scanf( %d , &b);         vis[b]++;       }       for (int i = maxn - 1; i > 1; i--) {         if (pre[i] == i) continue;         while (vis[i] > 0) {           printf( %d  , i);           vis[i]--;           vis[i / pre[i]]--;         }       }       for (int i = 2; i < maxn; i++) {         while (vis[i] > 0) {           printf( %d  , i);           vis[i]--;           vis[prime[i - 1]]--;         }       }       printf(  n );     }     return 0;   }   