TLE one day, AC another day, with identical source code

[quandray]

Problem SERI07 has a time limit of 0.1 seconds

My submission 31246155 on 22nd April received TLE

My submission 31255717 on 24th April received AC with a time of 0.02

Also, I was surprised that my other submissions for this problem (31245748 & 31245797) on 22nd April received TLE

[simes]

That’s the trouble with problems that have a ridiculously short time limit.

It wouldn’t take much variation in the start-up time, or time reading test cases from disk, or whatever, to push a solution into TLE.