How to take fast I/O in C++? - Codeforces
Wed Jul 08 2020 10:31:27 GMT+0000 (Coordinated Universal Time)
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https://codeforces.com/blog/entry/21562?Wed Jul 08 2020 10:31:27 GMT+0000 (Coordinated Universal Time)
Saved by @htrap
https://codeforces.com/blog/entry/21562?
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