Compilare: main.cpp: In constructor 'Big::Big(std::string)': main.cpp:47:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] main.cpp: In static member function 'static void Big::_sub_(std::vector<int>&, const std::vector<int>&)': main.cpp:160:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] main.cpp:162:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] main.cpp: In static member function 'static void Big::_sub2_(std::vector<int>&, const std::vector<int>&)': main.cpp:175:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] main.cpp:176:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] main.cpp:177:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] main.cpp: In static member function 'static void Big::_add_(std::vector<int>&, const std::vector<int>&)': main.cpp:190:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] main.cpp:192:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] main.cpp: In static member function 'static std::vector<int> Big::_slow_mult_(const std::vector<int>&, const std::vector<int>&)': main.cpp:225:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] main.cpp:226:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] main.cpp:233:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] main.cpp: In static member function 'static std::pair<std::vector<int>, std::vector<int> > Big::_div_(std::vector<int>, std::vector<int>)': main.cpp:279:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]