I too have received a plag message for problem C.

"Your solution 161082044 for the problem 1695C significantly coincides with solutions ZZZGen/161067422, excalibur1702/161082044, ivetrof5/161085438, Crime_and_Punishment/161088440, normie_coder/161092870, roshan2412/161110694"

The algo used is basic DP. The variable names are indeed similar but you can check my previous submissions. I've used similar variable names, as well as the same spacing / indentation / coding style in the past as this submission. Haven't used a public online IDE either.

Not to mention, ZZZGen/161067422 has the verdict "Passed" while the other submissions, including mine, are still "Skipped", which I don't understand at all.

I already contacted jdurie and he/she/they said they can't do anything about it. What should I do?

I request MikeMirzayanov to look into this matter. A few other people have also posted regarding false plag checks in this very question.