Seeking Sn = a + aa + aaa + ... + aa ... aaa (with n a) of the value, where a is a number of 2. For example, n = 5 when = 2 + 22 + 222 + 2222 + 22222, n input from the keyboard.
NoSuchKey
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Origin www.cnblogs.com/xuesujun/p/11204239.html
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