The contents of the array A, array B, and the content is exchanged / 1 / 1-1 / 2 + 1 / 3-1 / 4 + 1 / + 5 ...... calculated 1/99 - 1/100 of the value of / 1 to how many times the number 9 appears in all the integers 100
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Origin blog.csdn.net/weixin_44936160/article/details/89461384
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