Codeforces Round #420 (Div. 2)

這一場PP說很簡單，我就閒來無事敲一敲好了，反正也考完了（霧，不過只剩數據結構和c++ A. Okabe and Future Gadget Laboratory time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Okabe ne

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