foo.cc:18:23: error: stray '\343' in program
   18 |  for (int i=1;i<n;i++)　add(1<<i);
      |                       ^
foo.cc:18:24: error: stray '\200' in program
   18 |  for (int i=1;i<n;i++)　add(1<<i);
      |                        ^
foo.cc:18:25: error: stray '\200' in program
   18 |  for (int i=1;i<n;i++)　add(1<<i);
      |                         ^
foo.cc:19:28: error: stray '\343' in program
   19 |  for (int i=0;i<(1<<n);i++)　cout<<ans[i]<<endl;
      |                            ^
foo.cc:19:29: error: stray '\200' in program
   19 |  for (int i=0;i<(1<<n);i++)　cout<<ans[i]<<endl;
      |                             ^
foo.cc:19:30: error: stray '\200' in program
   19 |  for (int i=0;i<(1<<n);i++)　cout<<ans[i]<<endl;
      |                              ^
foo.cc: In function 'int main()':
foo.cc:15:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   15 |  scanf("%d",&n);
      |  ~~~~~^~~~~~~~~

[Hydro](https://hydro.ac)提供评测服务