foo.cc: In function ‘void build(int, int, int)’:
foo.cc:24:17: warning: suggest parentheses around ‘+’ inside ‘>>’ [-Wparentheses]
   24 |     int mid = l + r >> 1;
      |               ~~^~~
foo.cc: In function ‘void update(int, int, int, int, int)’:
foo.cc:34:17: warning: suggest parentheses around ‘+’ inside ‘>>’ [-Wparentheses]
   34 |     int mid = l + r >> 1;
      |               ~~^~~
foo.cc: In function ‘Node query(int, int, int, int, int)’:
foo.cc:43:17: warning: suggest parentheses around ‘+’ inside ‘>>’ [-Wparentheses]
   43 |     int mid = l + r >> 1;
      |               ~~^~~

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