Compilare: main.cpp: In function 'void solve(int)': main.cpp:34:36: warning: NULL used in arithmetic [-Wpointer-arith] 34 | for (int i = 0; gresit[i]!=NULL; i++) | ^~~~ main.cpp:47:28: warning: format '%d' expects argument of type 'int', but argument 4 has type 'std::set<char>::size_type' {aka 'long unsigned int'} [-Wformat=] 47 | fprintf(fout, "%d:%d\n", test, sol.size()); | ~^ ~~~~~~~~~~ | | | | int std::set<char>::size_type {aka long unsigned int} | %ld