https://leetcode.com/problems/add-digits/
找规律
~input: 0 1 2 3 4 ... output: 0 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 1 2 3 ....
public class Solution {
public int addDigits(int num) {
return 1 + (num - 1) % 9;
}
}
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