Compilare: main.cpp: In function 'void solve(int)': main.cpp:34:38: warning: NULL used in arithmetic [-Wpointer-arith] 34 | for (int i = 0; gresit[i] != NULL; i++) | ^~~~ main.cpp:47:25: warning: format '%d' expects argument of type 'int', but argument 3 has type 'std::set<char>::size_type' {aka 'long unsigned int'} [-Wformat=] 47 | fprintf(fout, "%d\n", sol.size()); | ~^ ~~~~~~~~~~ | | | | int std::set<char>::size_type {aka long unsigned int} | %ld