/in/foo.cc: In function 'void build(int&, int, int)':
/in/foo.cc:96:15: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   96 |     }int mid=l+r>>1;
      |              ~^~
/in/foo.cc: In function 'void upd(int, int, mat, mat, int, int, int)':
/in/foo.cc:104:14: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  104 |     int mid=l+r>>1;pushdown(x);
      |             ~^~
/in/foo.cc: In function 'mat query(int, int, int, int, int)':
/in/foo.cc:112:14: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  112 |     int mid=l+r>>1;pushdown(x);
      |             ~^~