/in/foo.cc: In function 'void build_tree(int, int, int)':
/in/foo.cc:22:14: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  int tm = tl + tr >> 1;
           ~~~^~~~
/in/foo.cc: In function 'll query_tree(ll, ll, ll, ll, ll)':
/in/foo.cc:42:13: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  ll tm = tl + tr >> 1;
          ~~~^~~~