/in/foo.cc: In member function 'int Splay::build(int, int, int)':
/in/foo.cc:142:18: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
         int mid=l+r>>1,p=++tot;
                 ~^~
/in/foo.cc: In function 'int main()':
/in/foo.cc:239:18: warning: unused variable 'x' [-Wunused-variable]
     for (int i=1,x;i<=n;i++)
                  ^