Compilare: user.cpp: In function ‘void euler(int, int)’: user.cpp:19:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<(::nod[nod].next.size());i++) ^ user.cpp: In function ‘int query(int, int)’: user.cpp:41:93: warning: suggest parentheses around ‘+’ inside ‘<<’ [-Wparentheses] return level[mat[inc][j]] <= level[mat[sf-(1<<j)+1][j]] ? v[mat[inc][j]] : v[mat[sf-1<<j+1][j]]; ^ user.cpp: In function ‘int main()’: user.cpp:46:15: warning: unused variable ‘root’ [-Wunused-variable] int a,n,m,root,b; ^