foo.cc: In function 'void build(int, int, int)':
foo.cc:26:20: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   26 |         int mid = L+R >> 1;
      |                   ~^~
foo.cc: In function 'void update(int, int, int, int, int)':
foo.cc:36:20: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   36 |         int mid = L+R >> 1;
      |                   ~^~
foo.cc: In function 'node query(int, int, int, int, int)':
foo.cc:48:16: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   48 |         mid = L+R >> 1;
      |               ~^~

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