/in/foo.cc: In function 'void insert(int&, int, int, int, const int&)':
/in/foo.cc:22:18: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   const int mid=l+r>>1;
                 ~^~
/in/foo.cc: In function 'int kth(const int&, const int&, int, int, int)':
/in/foo.cc:30:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  const int mid=l+r>>1;
                ~^~