Compilare: user.cpp: In function ‘int main()’: user.cpp:31:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v.size();i++) ^ user.cpp:33:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=it;i<str.size();i++) ^ user.cpp:33:19: warning: ‘it’ may be used uninitialized in this function [-Wmaybe-uninitialized] for(int i=it;i<str.size();i++) ^