[AtCoder] You are given an integer N. Find the number of strings of length N that satisfy the following conditions, modulo 10^9+7: - 题解

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题目信息
题号 P15845
标题 [AtCoder] You are given an integer N. Find the number of strings of length N that satisfy the following conditions, modulo 10^9+7:
难度 普及
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