Is this new judging system an update to the judge machine’s configuration, or does it simply add support for more programming languages? If they’ve actually changed the judge machine, maybe programs could run a bit faster? (I have a bit of a TLE phobia…)

I’m not as fast at coding as those real experts, but one of my friends once told me during an ABC contest that AtCoder allowed the use of Copilot as a coding assistant.If I remember correctly, the previous anti-AI policy still allowed using Copilot to assist with coding and speed things up, but now it’s completely banned.

I never really used Copilot for contests anyway — its auto-completion feels kind of “dumb” and often has no idea what I actually want to write.

Since GPT-5 solved all the problems in the ICPC World Final, it seems that many competitive programming training platforms have started banning the use of AI.

Still, I hope I can achieve good results in upcoming contests — and wish everyone the best of luck in reaching their own goals too

well,it has been prove that the Lower bound of time complexity is $$$O(n^2)\to O(n^{2-O(1))})$$$(3SUM). But since the problem didn't mention how to handle the "no solution" case, just using randomness is okay.