Compilare: user.cpp: In function ‘int main()’: user.cpp:19:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(verif(last,s[ind]) && ind<s.size()+1) ^ user.cpp:22:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=ind;i<s.size();++i){ ^ user.cpp:24:48: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(verif(last,s[i]) && i<s.size()){ ^ user.cpp:28:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i==s.size()) break; ^