answer.code:1:2: warning: #import is a deprecated GCC extension [-Wdeprecated]
    1 | #import<time.h>
      |  ^~~~~~
answer.code:2:1: warning: ISO C++ forbids declaration of ‘main’ with no type [-Wreturn-type]
    2 | main(){int t=time(0);puts(t&1?"mark 0":"ok");while(time(0)==t);}
      | ^~~~
answer.code: In function ‘int main()’:
answer.code:2:22: error: ‘puts’ was not declared in this scope
    2 | main(){int t=time(0);puts(t&1?"mark 0":"ok");while(time(0)==t);}
      |                      ^~~~