Sorry for this shit blog. I am quite emotional now. I admit I am stupid!!!

Still only solve 4 problems in ABC284:

1. RE in problem A because I select the Python interpreter instead of G++.
2. Stuck at D because of an unknown bug of my Pollard Rho template, and stuck it again because of a buggy binary search template.
3. Stuck at E.
4. Get idea for F, pass 2 minutes after the contest. I use string hash: https://atcoder.jp/contests/abc284/submissions/37848937

Please comfort me or just tell me I am stupid. I admit that I am stupid and behave like a so-called giant baby but I really need comfort, thank you for your help!