Compilare: main.cpp: In function 'void solution()': main.cpp:41:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 41 | for(int i=0; i<factors.size(); i++) | ~^~~~~~~~~~~~~~~ main.cpp: In function 'void backtracking(int)': main.cpp:51:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 51 | if(step==factors.size()-1) | ~~~~^~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:106:37: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 106 | for(int q=k+1; q<d.size(); q++) | ~^~~~~~~~~