/in/foo.cc: In function 'void solve()':
/in/foo.cc:41:37: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   41 |                         int mid = l + r >> 1;
      |                                   ~~^~~
/in/foo.cc:49:37: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   49 |                         int mid = l + r >> 1;
      |                                   ~~^~~