Compilare: user.cpp: In function ‘int main()’: user.cpp:66:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(long i = firstst; i < l.size(); i += st.length()) ^ user.cpp:52:8: warning: ‘y’ may be used uninitialized in this function [-Wmaybe-uninitialized] long y; ^ user.cpp:66:27: warning: ‘firstst’ may be used uninitialized in this function [-Wmaybe-uninitialized] for(long i = firstst; i < l.size(); i += st.length()) ^