/in/foo.cc: In function 'void change(int&, int, int, int, int)':
/in/foo.cc:56:14: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  int mid = l + r >> 1;
            ~~^~~
/in/foo.cc: In function 'int query(int, int, int, int, int)':
/in/foo.cc:64:14: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  int mid = l + r >> 1;
            ~~^~~