func_code_string: #include <bits/stdc++.h>   using namespace std;   long long int power(long long int a, long long int b) {     long long int res = 1;     a %= 1000000007;     assert(b >= 0);     for (; b; b >>= 1) {       if (b & 1) res = res * a % 1000000007;       a = a * a % 1000000007;     }     return res;   }   long long int modInverse(long long int a) { return power(a, 1000000007 - 2); }   const int N = 500023;   bool compare(long long int x, long long int y) { return x > y; }   void solve() {     vector<int> primes = {         2,   3,   5,   7,   11,  13,  17,  19,  23,  29,  31,  37,  41,  43,         47,  53,  59,  61,  67,  71,  73,  79,  83,  89,  97,  101, 103, 107,         109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181,         191, 193, 197, 199, 211, 223, 227, 229, 233, 239, 241, 251, 257, 263,         269, 271, 277, 281, 283, 293, 307, 311, 313, 317, 331, 337, 347, 349,         353, 359, 367, 373, 379, 383, 389, 397, 401, 409, 419, 421, 431, 433,         439, 443, 449, 457, 461, 463, 467, 479, 487, 491, 499, 503, 509, 521,         523, 541, 547, 557, 563, 569, 571, 577, 587, 593, 599, 601, 607, 613,         617, 619, 631, 641, 643, 647, 653, 659, 661, 673, 677, 683, 691, 701,         709, 719, 727, 733, 739, 743, 751, 757, 761, 769, 773, 787, 797, 809,         811, 821, 823, 827, 829, 839, 853, 857, 859, 863, 877, 881, 883, 887,         907, 911, 919, 929, 937, 941, 947, 953, 967, 971, 977, 983, 991, 997};     int n, value, nocolor = 1, colored = 0;     cin >> n;     vector<pair<int, int>> color;     for (int i = 0; i < n; i++) {       cin >> value;       color.push_back(make_pair(value, 0));     }     for (int i = 0; i < primes.size(); i++) {       for (int j = 0; j < n; j++) {         if ((color[j].first % primes[i] == 0) && (color[j].second == 0)) {           color[j].second = nocolor;           colored = 1;         }       }       if (colored) {         nocolor++;       }       colored = 0;     }     cout << nocolor - 1 << endl;     for (int i = 0; i < n; i++) {       cout << color[i].second <<    ;     }     cout << endl;     return;   }   int main() {     {       ios ::sync_with_stdio(false);       cin.tie(0);       cout.tie(0);     };     int T;     cin >> T;     int t = 0;     while (t++ < T) {       solve();     }     cerr <<  Time :   << 1000 * ((double)clock()) / (double)CLOCKS_PER_SEC          <<  ms n ;   }   