Compilare: main.cpp: In member function 'void m::operator+=(const m&)': main.cpp:15:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 15 | while(i<el.size()&&j<a.el.size()) | ~^~~~~~~~~~ main.cpp:15:29: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 15 | while(i<el.size()&&j<a.el.size()) | ~^~~~~~~~~~~~ main.cpp:21:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 21 | while(i<el.size()) ans.push_back(el[i++]); | ~^~~~~~~~~~ main.cpp:22:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 22 | while(j<a.el.size())ans.push_back(a.el[j++]); | ~^~~~~~~~~~~~ main.cpp: In member function 'void m::operator*=(const m&)': main.cpp:31:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 31 | while(i<el.size()&&j<a.el.size()) | ~^~~~~~~~~~ main.cpp:31:29: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 31 | while(i<el.size()&&j<a.el.size()) | ~^~~~~~~~~~~~ main.cpp: In function 'm mult()': main.cpp:74:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 74 | while(p<ex.size()&&ex[p]=='*') | ~^~~~~~~~~~ main.cpp: In function 'm add()': main.cpp:85:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 85 | while(p<ex.size()&&ex[p]=='+') | ~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:106:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 106 | while(j<a.size()) x=x*10+a[j++]-'0'; | ~^~~~~~~~~