Hello @leetcode, I was really pumped when I saw 30-day leetcode challenge.
But, when I saw the first question which was #136 Single number for me, I got dissappointed. 😢

I have already solved this before, as soon as I land on that problem page, I can also see my submitted solution, I just resubmitted again and BAM! it got accepted.

So leetcode, can you please give different questions than the ones that are listed (~1300) or if it is already solved, can you please erase my previously submitted solution.