2020牛客暑期多校训练营（第九场）A.Groundhog and 2-Power Representation

题目链接

题目描述

Groundhog took a math class. In this class, his math teacher said:

Any positive integer can be represented by the power of $2$. For example:$137=2^7+2^3+2^0$.

And powers are expressed in parentheses.That is ,${a(b)}$ stands for ${a^b}$.Therefore,$137$ can be expressed as $137={2(7)+2(3)+2(0)}$.

Further more,for $7=2^2+2+2^0$ is expressed with ${2}$，$3=2+2^0$,137 can be finally expressed as ${137=2(2(2)+2+2(0))+2(2+2(0))+2(0)}$.

Another example:$1315=2^{10}+2^8+2^5+2+1 = 2(2(2+2(0))+2)+2(2(2+2(0)))+2(2(2)+2(0))+2+2(0)$.

Groundhog feels amazing and wants you to write a program to simulate the above content.You need to read in an expression that is a power of {2}2 and calculate its value.

输入描述:

Given a string, indicating the power representation.

输出描述:

Output the original number.

示例1

输入

2(2(2+2(0))+2)+2(2(2+2(0)))+2(2(2)+2(0))+2+2(0)

输出

1315

熟悉 $python$ 的都知道 $python$ 有个 $eval$ 函数可以直接求表达式的值，那么我们只需要把 $($ 替换成 $**($ 即可，因为在 python 中 $2**x$ 代表 $x$ 幂，AC代码如下：

print(eval(input().replace('(','**(')))

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