Compilare: main.cpp: In function 'void backtrack(std::vector<long int>&, int, int, int64_t)': main.cpp:30:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 30 | if(poz == b_factors.size()) { | ~~~~^~~~~~~~~~~~~~~~~~~ main.cpp: In function 'void solve()': main.cpp:67:13: warning: unused variable 'n' [-Wunused-variable] 67 | int n = b_factors.size(); // numarul de divizori primi | ^