foo.cc: In function 'void build(int, int, int)':
foo.cc:45:26: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   45 |                 int mid=l+r>>1;
      |                         ~^~
foo.cc: In function 'void update(int, int, int, ll)':
foo.cc:60:32: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   60 |                 int mid=tr[u].l+tr[u].r>>1;
      |                         ~~~~~~~^~~~~~~~
foo.cc: In function 'll query(int, int, int)':
foo.cc:71:32: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   71 |                 int mid=tr[u].l+tr[u].r>>1;
      |                         ~~~~~~~^~~~~~~~

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