Compilare: user.cpp: In function ‘int main()’: user.cpp:18:62: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(*(s.rbegin()) - *(s.begin()) > z || s.size() > y ) ^ user.cpp:23:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(s.size()>=sol) ^ user.cpp:31:36: warning: ‘posy’ may be used uninitialized in this function [-Wmaybe-uninitialized] else out<<sol<<' '<<posx<<' '<<posy<<'\n'; ^ user.cpp:31:25: warning: ‘posx’ may be used uninitialized in this function [-Wmaybe-uninitialized] else out<<sol<<' '<<posx<<' '<<posy<<'\n'; ^