Support a new way to judge

[ksyx]

The problem writer upload a standard program and inputs, get answer using standard program and compare with the output of the submission. We don't need to generate standard outputs with this feature.

[q234rty]

Why is this useful?

[ksyx]

We need to use standard program to generate correct output, using this method of judging can save time generating them, especially when changing input files.

[undefined-moe]

It takes more CPU time for each test case, which is unnecessary.