文件名称:AB
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用字符串输入，然后像做加法一样，对应位相加，然后看是否进位，进位的话下一位加一，用电脑本身的加法是不可能实现20多位的加法的，所以自己写个高精度加法，加几千位甚至上万位都是没问题的。
-I have a very simple problem for you. Given two integers A and B, your job is to calculate the Sum of A+ B.
-I have a very simple problem for you. Given two integers A and B, your job is to calculate the Sum of A+ B.
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AB.cpp