Compilare: main.cpp: In member function 'void BigNumber::shift_right(int)': main.cpp:109:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 109 | if (power >= digits.size()) { | ~~~~~~^~~~~~~~~~~~~~~~ main.cpp: In constructor 'BigNumber::BigNumber(const std::string&)': main.cpp:134:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 134 | for (int i = 0; i < digits.size(); ++i) { | ~~^~~~~~~~~~~~~~~ main.cpp: In member function 'long long int BigNumber::to_llong()': main.cpp:189:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 189 | for (int i = 0; i < digits.size(); ++i) { | ~~^~~~~~~~~~~~~~~ main.cpp: In function 'std::istream& operator>>(std::istream&, BigNumber&)': main.cpp:202:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 202 | for (int i = 0; i < other.digits.size(); ++i) { | ~~^~~~~~~~~~~~~~~~~~~~~