/in/foo.cc: In function 'void modify(int, int, int, int, int)':
/in/foo.cc:59:14: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  int mid = l + r >> 1;
            ~~^~~
/in/foo.cc: In function 'void build(int, int, int)':
/in/foo.cc:71:14: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  int mid = l + r >> 1;
            ~~^~~