Compilare: main.cpp: In function 'int main()': main.cpp:77:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 77 | for(int i=0;i<r.size();++i) | ~^~~~~~~~~ main.cpp:81:46: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 81 | while(r[i]>='0' && r[i]<='9' && i<r.size()) | ~^~~~~~~~~ main.cpp:76:24: warning: unused variable 'c' [-Wunused-variable] 76 | long long int nr=0,c; | ^ main.cpp: In function 'int ev(char)': main.cpp:19:1: warning: control reaches end of non-void function [-Wreturn-type] 19 | } | ^