LTIME64B : CHEFRES (AC in practice but WA in contest)

My code for this problem is accepted now(practice) but , i dont understand that why i got only 30 point and WA for rest of test cases during the contest.

link of my solution :

@admin please have a look into it ,take a right action about that.Because i got a huge lose in my ratings .
You have take already 20+ days but you have not unrated the contest till now.

Now it’s really unfair if such problems are overlooked during a contest. I suffered getting a poor rank for the mistake i didn’t even do. And I believe, many others. How such contest can even go rated?
Please make the contest LTIME64B unrated if possible or give us (me and many others who have suffered from such problem) bonus for that contest.
Thanking you …!