Let's discuss problems.
B is very nice. Until the end of the contest, I thought it was a marathon task. Then yutaka1999 told me the following: for an odd prime p, a[p] = 2 - p%4.
And I like geometry tasks like J.
GP of Moscow Workshop
Let's discuss problems.
B is very nice. Until the end of the contest, I thought it was a marathon task. Then yutaka1999 told me the following: for an odd prime p, a[p] = 2 - p%4.
And I like geometry tasks like J.
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