Compilare: main.cpp: In function 'void add_factor(int)': main.cpp:18:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 18 | for(int i = 0; i < factori.size(); i++) | ~~^~~~~~~~~~~~~~~~ main.cpp: In function 'void remove_factor(int)': main.cpp:32:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 32 | for(int i = 0; i < factori.size(); i++) | ~~^~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:66:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 66 | if(on == factori.size()) | ~~~^~~~~~~~~~~~~~~~~