[AtCoder] Find the number of ways to choose a pair of an even number and an odd number from the positive integers between 1 and K (inclusive). The order does not matter. - 题解

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题目信息
题号 P20437
标题 [AtCoder] Find the number of ways to choose a pair of an even number and an odd number from the positive integers between 1 and K (inclusive). The order does not matter.
难度 普及-
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