[Leetcode] Number of Digit Ones
Given an integer n, count the total number of digit 1 appearing in all non-negative integers less than or equal to n.
For example:
Given n = 13,
Return 6, because digit 1 occurred in the following numbers: 1, 10, 11, 12, 13.
Hint:
- Beware of overflow.
大神的解答,讲得很清楚:
对于每一位,都需要考虑3种情况:0,1,2。
http://blog.csdn.net/elton_xiao/article/details/48578387
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