The task is simple: given any positive integer N, you are supposed to count the total number of 1’s in the decimal form of the integers from 1 to N. For example, given N being 12, there are five 1’s in 1, 10, 11, and 12.The task is simple: given any positive integer N,
阅读背景：
1049. Counting Ones (30)计算1的个数
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