Compilare: main.cpp: In member function 'BigNumber BigNumber::operator+(const BigNumber&) const': main.cpp:17:33: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 17 | for(int i = 0, t = 0; i < oth.d.size() || i < d.size() || t; i++, t /= 10) { | ~~^~~~~~~~~~~~~~ main.cpp:17:53: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 17 | for(int i = 0, t = 0; i < oth.d.size() || i < d.size() || t; i++, t /= 10) { | ~~^~~~~~~~~~ main.cpp:18:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 18 | t += (i < oth.d.size() ? oth.d[i] : 0); | ~~^~~~~~~~~~~~~~ main.cpp:19:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 19 | t += (i < d.size() ? d[i] : 0); | ~~^~~~~~~~~~ main.cpp: In member function 'BigNumber BigNumber::operator*(int) const': main.cpp:28:33: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 28 | for(int i = 0, t = 0; i < d.size() || t; i++, t /= 10) { | ~~^~~~~~~~~~ main.cpp:29:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 29 | t += (i < d.size() ? d[i] : 0) * x; | ~~^~~~~~~~~~