func_code_string: #include <bits/stdc++.h>   using std::max;   using std::min;   const int inf = 0x3f3f3f3f, Inf = 0x7fffffff;   const long long INF = 0x3f3f3f3f3f3f3f3f;   __inline__ __attribute__((always_inline)) unsigned int rnd() {     static unsigned int seed = 416;     return seed ^= seed >> 5, seed ^= seed << 17, seed ^= seed >> 13;   }   template <typename _Tp>   _Tp gcd(const _Tp &a, const _Tp &b) {     return (!b) ? a : gcd(b, a % b);   }   template <typename _Tp>   __inline__ __attribute__((always_inline)) _Tp abs(const _Tp &a) {     return a >= 0 ? a : -a;   }   template <typename _Tp>   __inline__ __attribute__((always_inline)) void chmax(_Tp &a, const _Tp &b) {     (a < b) && (a = b);   }   template <typename _Tp>   __inline__ __attribute__((always_inline)) void chmin(_Tp &a, const _Tp &b) {     (b < a) && (a = b);   }   template <typename _Tp>   __inline__ __attribute__((always_inline)) void read(_Tp &x) {     char ch(getchar());     bool f(false);     while (!isdigit(ch)) f |= ch == 45, ch = getchar();     x = ch & 15, ch = getchar();     while (isdigit(ch)) x = (((x << 2) + x) << 1) + (ch & 15), ch = getchar();     f && (x = -x);   }   template <typename _Tp, typename... Args>   __inline__ __attribute__((always_inline)) void read(_Tp &t, Args &...args) {     read(t);     read(args...);   }   template <typename _Tp, typename... Args>   __inline__ __attribute__((always_inline)) _Tp min(const _Tp &a, const _Tp &b,                                                     const Args &...args) {     return a < b ? min(a, args...) : min(b, args...);   }   template <typename _Tp, typename... Args>   __inline__ __attribute__((always_inline)) _Tp max(const _Tp &a, const _Tp &b,                                                     const Args &...args) {     return a < b ? max(b, args...) : max(a, args...);   }   __inline__ __attribute__((always_inline)) int read_str(char *s) {     char ch(getchar());     while (ch ==     || ch ==   r  || ch ==   n ) ch = getchar();     char *tar = s;     *tar = ch, ch = getchar();     while (ch !=     && ch !=   r  && ch !=   n  && ch != EOF)       *(++tar) = ch, ch = getchar();     return tar - s + 1;   }   const int N = 100005;   const int MAXN = 10000005;   bool pr[MAXN];   int _p[MAXN >> 3], _pos;   int md[MAXN];   void sieve() {     for (int i = 2; i < MAXN; ++i) {       if (!pr[i]) {         _p[++_pos] = i;         md[i] = i;       }       for (int j = 1; j <= _pos && i * _p[j] < MAXN; ++j) {         pr[i * _p[j]] = true;         md[i * _p[j]] = _p[j];         if (!(i % _p[j])) break;       }     }   }   std::vector<int> p[N], d[N];   int c[MAXN], cnt[1 << 8], mul[1 << 8];   int calc(int id) {     int siz = ((int)p[id].size()), ans = 0;     for (int i = 0; i < siz; ++i) mul[1 << i] = p[id][i];     for (int i = 1; i < 1 << siz; ++i) {       cnt[i] = cnt[i >> 1] + (i & 1);       mul[i] = mul[i ^ ((i) & (-(i)))] * mul[((i) & (-(i)))];       if (cnt[i] & 1)         ans += c[mul[i]];       else         ans -= c[mul[i]];     }     return ans;   }   int a[N];   int _val[11], _cnt[11], pos, cur_id;   void dfs(int dep, int val) {     if (dep == pos + 1) {       d[cur_id].push_back(val);       return;     }     for (int i = 0; i <= _cnt[dep]; ++i) {       dfs(dep + 1, val);       if (i < _cnt[dep]) val *= _val[dep];     }   }   bool ban[N], vis[N];   int deg[N];   int f(int mid) {     while (ban[mid]) --mid;     if (!mid) return false;     int qwq = 0;     for (int i = 1; i <= mid; ++i)       if (!ban[i]) {         ++qwq;         for (auto it : d[i]) ++c[it];       }     int ans = 0;     for (int i = 1; i <= mid; ++i)       if (!ban[i] && calc(i) != qwq) ++ans;     for (int i = 1; i <= mid; ++i)       if (!ban[i])         for (auto it : d[i]) --c[it];     return ans;   }   std::vector<int> getnodes(int mid) {     while (ban[mid]) --mid;     std::vector<int> nd;     int qwq = 0;     for (int i = 1; i <= mid; ++i)       if (!ban[i]) {         ++qwq;         for (auto it : d[i]) ++c[it];       }     for (int i = 1; i <= mid; ++i)       if (!ban[i] && calc(i) != qwq) nd.push_back(i);     for (int i = 1; i <= mid; ++i)       if (!ban[i])         for (auto it : d[i]) --c[it];     return nd;   }   int main() {     mul[0] = 1;     sieve();     int n, k;     read(n, k);     for (int i = 1; i <= n; ++i) {       read(a[i]);       ++c[a[i]];       int cur = a[i], last = 0;       pos = 0;       while (cur > 1) {         if (md[cur] != last)           p[i].push_back(md[cur]), _val[++pos] = md[cur], _cnt[pos] = 1;         else           ++_cnt[pos];         last = md[cur];         cur /= last;       }       cur_id = i;       dfs(1, 1);     }     for (int j = 1; j <= _pos; ++j)       for (int i = (MAXN - 1) / _p[j]; i >= 1; --i) c[i] += c[i * _p[j]];     std::vector<int> nd;     for (int i = 1; i <= n; ++i) {       if ((deg[i] = calc(i)) <= n - 2) {         nd.push_back(i);         for (int j = 1; j <= n && ((int)nd.size()) < 3; ++j)           if (i != j && gcd(a[i], a[j]) == 1) nd.push_back(j);         break;       }     }     if (nd.empty()) {       std::vector<int> clique, rest;       for (int i = 1; i <= n; ++i)         if (deg[i] == n)           clique.push_back(i);         else           rest.push_back(i);       if (((int)clique.size()) > k) clique.resize(k);       for (int i = 1; i <= n && ((int)clique.size()) < k; ++i) {         if (!vis[i] && deg[i] == n - 1) {           clique.push_back(i);           for (auto it : rest)             if (gcd(a[it], a[i]) == 1) vis[it] = true;         }       }       for (auto it : clique) printf( %d  , it);       printf(  n );       return 0;     }     assert(((int)nd.size()) == 3);     if (k == 3) {       for (auto it : nd) printf( %d  , it);       printf(  n );       return 0;     }     for (auto it : nd) ban[it] = true;     for (auto id : nd)       for (auto it : d[id]) --c[it];     std::vector<int> clique;     for (int i = 1; i <= n; ++i)       if (!ban[i] && ((deg[i] = calc(i)) == n - 3)) clique.push_back(i);     if (((int)clique.size()) >= k) {       clique.resize(k);       for (auto it : clique) printf( %d  , it);       printf(  n );       return 0;     }     memset(c, 0, sizeof(c));     int l = 1, r = n;     while (l < r) {       int mid = (l + r) >> 1;       if (f(mid) + 3 >= k)         r = mid;       else         l = mid + 1;     }     std::vector<int> v1 = getnodes(l - 1);     std::vector<int> v2 = getnodes(l);     assert(f(l - 1) == ((int)v1.size()));     assert(f(l) == ((int)v2.size()));     assert(((int)v1.size()) + 3 < k);     assert(((int)v2.size()) + 3 >= k);     std::sort(v1.begin(), v1.end());     std::vector<int> qwq;     for (auto it : v2) {       auto _ = std::lower_bound(v1.begin(), v1.end(), it);       if (_ == v1.end() || *_ != it) qwq.push_back(it);     }     std::sort(qwq.begin(), qwq.end());     assert(((int)v1.size()) + ((int)qwq.size()) == ((int)v2.size()));     if (((int)v1.size()) + 3 + 1 == k && ((int)qwq.size()) != 1)       v1.push_back(nd[0]), v1.push_back(nd[1]);     else       v1.push_back(nd[0]), v1.push_back(nd[1]), v1.push_back(nd[2]);     while (((int)v1.size()) < k) {       v1.push_back(qwq.back());       qwq.pop_back();     }     assert(((int)v1.size()) == k);     for (auto it : v1) printf( %d  , it);     printf(  n );     return 0;   }   