Today, I submitted a Python3 program to the ["Going Home"](https://codeforces.me/contest/1501/problem/C) Problem in ContestRound 707. My program passed all pretests, but apparenty had aunfortunately did timeout when tested. After the contest I looked at some other Python3 solutions, and they looked very similar to my solution. I changed a few minor things (, every version was accepted). Eventually I decided to submit my original contest solution [again](http://https://codeforces.me/contest/1501/submission/109907626). To my surprise it now passed. Barely, with 1996ms, but it passed. as well! Why now and not in the contest?!?↵
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Lessons learned: ↵
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1). Even if pretests are passed, it's probably safer to submit with PyPy instead of Python.↵
2). When your time is close to the time limit, you may be lucky, or you may be unlucky.↵
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Lessons learned: ↵
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2
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