foo.cc: In lambda function:
foo.cc:26:49: error: ‘struct stu’ has no member named ‘zs’
   26 |         sort(a+1,a+1+n,[](stu a,stu b){return a.zs>b.zs;});
      |                                                 ^~
foo.cc:26:54: error: ‘struct stu’ has no member named ‘zs’
   26 |         sort(a+1,a+1+n,[](stu a,stu b){return a.zs>b.zs;});
      |                                                      ^~