===================================
0 1 2 3 4 5 6 7 8 9
10 11 12 13 14 15 16 17 18
19 20 21 22 23 24 25 26 27
28 29 ...
===================================
Ref
[1] https://leetcode.com/problems/add-digits/
[2] https://leetcode.com/discuss/52122/accepted-time-space-line-solution-with-detail-explanations
OJ
0 1 2 3 4 5 6 7 8 9
10 11 12 13 14 15 16 17 18
19 20 21 22 23 24 25 26 27
28 29 ...
===================================
Ref
[1] https://leetcode.com/problems/add-digits/
[2] https://leetcode.com/discuss/52122/accepted-time-space-line-solution-with-detail-explanations
OJ
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