/in/foo.cc: In member function 'void ZBQtxdy::insert(int&, int, int, int, int)':
/in/foo.cc:39:15: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   int mid = l + r >> 1;
             ~~^~~
/in/foo.cc: In member function 'long long int ZBQtxdy::Query(int, int, int, int, int)':
/in/foo.cc:46:15: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   int mid = l + r >> 1, lsiz = siz[ls[rt]] - siz[ls[p]];
             ~~^~~