Compilare: main.cpp: In member function 'NR NR::operator+(const NR&) const': main.cpp:24:27: warning: comparison of integer expressions of different signedness: 'long long int' and 'const long unsigned int' [-Wsign-compare] 24 | for (int i = 0; i < max (a.size(), other.a.size()); i ++) { | ~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:27:27: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 27 | partial += (i < a.size() ? a[i] : 0) + (i < other.a.size() ? other.a[i] : 0); | ~~^~~~~~~~~~ main.cpp:27:55: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 27 | partial += (i < a.size() ? a[i] : 0) + (i < other.a.size() ? other.a[i] : 0); | ~~^~~~~~~~~~~~~~~~ main.cpp: In member function 'NR NR::operator*(const long long int&) const': main.cpp:38:27: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 38 | for (int i = 0; i < a.size(); i ++) { | ~~^~~~~~~~~~