I submitted 16248609 and it failed with a compilation error: Can't compile file: File should contain class/object named as the file.

I could not figure out what was wrong with my submission since it compiled fine locally; so I submitted it again and CodeForces complained that I am trying to submit the same file! So I removed an empty line and submitted it again and 16248804 got accepted!

629A - Far Relative’s Birthday Cake was a really unlucky problem for me as I ran into a surprising Scala issue too which gave me a TLE: http://stackoverflow.com/questions/35528057/scala-performance-difference-between-nested-for-loops