Compilare: main.cpp: In function 'int main()': main.cpp:18:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 18 | for(int i=0; i<v.size(); i++) | ~^~~~~~~~~ main.cpp:23:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 23 | while(i<v.size() && v[i]>='0' && v[i]<='9') | ~^~~~~~~~~ main.cpp:17:10: warning: unused variable 'semn' [-Wunused-variable] 17 | bool semn=0; | ^~~~