Compilare: user.cpp: In function ‘int getnr(int)’: user.cpp:20:15: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] x=x&((1<<n-2)-1); ^ user.cpp:24:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘void euler()’: user.cpp:35:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=lastp[nod]; i<v[nod].size(); ++i) ^