/in/foo.cc:6:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main(){
      ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:17:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
     for(register int i=1;i<=n;i++) printf("%d\n",ans[i]);return 0;
     ^~~
/in/foo.cc:17:58: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
     for(register int i=1;i<=n;i++) printf("%d\n",ans[i]);return 0;
                                                          ^~~~~~