Compilare: user.cpp: In function ‘int main()’: user.cpp:13:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(k!=string::npos) ^ user.cpp:18:49: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(s[k]<'a' && s[k]!=')' && k<s.size()) ^ user.cpp:37:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(s[poz]<'a' && poz<s.size()) ^ user.cpp:46:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v.size()-1; i++) ^ user.cpp:55:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v.size(); i++) ^