[Java] I participated in ABC-188 of Atcorder.

Good evening. This is the first post. Thank you.

On 2021/1/10, I participated in Atcorder's ABC contest and got a rate. https://atcoder.jp/users/ishikawaryou

I managed to solve the C problem in time. I'm originally a COBOL engineer and I'm completely self-taught in Java, but I'll praise myself for solving the C problem, though it takes time.

I will continue to work hard and aim for brown! Those who are also working hard at the gray level will do their best together.

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