[HackerEarth] An Officer wants to give unique numbers to the newly recruit soldiers. He likes strange strings which can have only two digits '3' and '5'. - 题解

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题目信息
题号 P14000
标题 [HackerEarth] An Officer wants to give unique numbers to the newly recruit soldiers. He likes strange strings which can have only two digits '3' and '5'.
难度 普及
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