/in/foo.cc: In function 'void build(int, int, int)':
/in/foo.cc:203:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
     int mid = l + r >> 1;
               ~~^~~
/in/foo.cc: In function 'int query(int, int, int)':
/in/foo.cc:214:23: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
     int mid = tr[u].l + tr[u].r >> 1;
               ~~~~~~~~^~~~~~~~~