Compilare: user.cpp: In function ‘int verif(std::string)’: user.cpp:16:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(s.size()!=L[t])return 0; ^ user.cpp:17:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<s.size();i++) ^ user.cpp: In function ‘void rec(int, std::string, std::string)’: user.cpp:23:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(s.size()>L[t] || ok==1)return; ^ user.cpp:25:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(!islet(s[i]) && i<s.size()) ^ user.cpp:30:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i==s.size()) ^ user.cpp:40:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int q=i+1;q<s.size();q++) ^