Compilare: user.cpp: In function ‘int main()’: user.cpp:37:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(d!= std::string::npos) ^ user.cpp:52:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i<s.size()-1 && sem==0) ^ user.cpp:12:11: warning: unused variable ‘m’ [-Wunused-variable] int n,m,i,sem,d; ^ user.cpp:13:10: warning: unused variable ‘p’ [-Wunused-variable] char p; ^