Unable to find WA testcases (Pro function malfunctioning)

I don’t have Pro subscribtion, but, as I far as I know, contest problems have 1-day free Pro functions. So I am trying to see failed test cases using this tool, but it shows some mistake. I really wanna know where it failed, as this problem involves some new algorithms for me and I want to solve it without the help of Edutorial.
Btw, here is my code: CodeChef | Competitive Programming | Participate & Learn

Thanks for reporting. This is one of the few problems where the WA feature won’t work because of input format. We have now disabled the feature for this.