foo.cc: In function 'void Work2()':
foo.cc:135:29: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  135 |                 int mid = l + r >> 1;
      |                           ~~^~~
foo.cc: In function 'void Work3()':
foo.cc:170:29: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  170 |                 int mid = l + r >> 1;
      |                           ~~^~~

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