foo.c: In function 'prin':
foo.c:27:2: warning: this 'while' clause does not guard... [-Wmisleading-indentation]
  while (--vp);
  ^~~~~
foo.c:28:3: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'while'
   printf(" %d", path[vp]);
   ^~~~~~
foo.c: In function 'main':
foo.c:44:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &n);
  ^~~~~~~~~~~~~~~

自豪的采用HydroJudge(https://github.com/hydro-dev/Hydro)进行评测。