/in/foo.cc: In lambda function:
/in/foo.cc:22:49: error: 'struct stu' has no member named 'zs'
   22 |         sort(a+1,a+1+n,[](stu a,stu b){return a.zs>b.zs;});
      |                                                 ^~
/in/foo.cc:22:54: error: 'struct stu' has no member named 'zs'
   22 |         sort(a+1,a+1+n,[](stu a,stu b){return a.zs>b.zs;});
      |                                                      ^~