Compilare: main.cpp: In function 'void backt(int, int)': main.cpp:52:32: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 52 | for(int i = x[poz-1] + 1; i<fact.size(); i++) | ~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:105:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 105 | for(int i = 1; i<fact.size(); i++) | ~^~~~~~~~~~~~