Compilare: user.cpp: In function ‘void _sort_(long int&, int&)’: user.cpp:12:10: warning: unused variable ‘y’ [-Wunused-variable] long y=0; ^ user.cpp: In function ‘int main()’: user.cpp:45:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(p[j].size()>mxnrs){ ^ user.cpp:49:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] }else if(p[j].size()==mxnrs){ ^ user.cpp:66:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<p[plutonmx].size(); i++)out<<p[plutonmx][i]<<" "; ^