Compilare: user.cpp: In function ‘int main()’: user.cpp:46:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(s[i].first.size()==lgmax) { ^ user.cpp:53:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<v.size();++j) { ^ user.cpp:55:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(k=0;k<v[j].first.size()&&st<s[i].first.size();++k) ^ user.cpp:55:53: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(k=0;k<v[j].first.size()&&st<s[i].first.size();++k) ^ user.cpp:58:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(st==s[i].first.size()) { ^ user.cpp:69:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v.size();++i) ^