66. 加一问题 Plus One

Given a non-negative integer represented as a non-empty array of digits, plus one to the integer.

You may assume the integer do not contain any leading zero, except the number 0 itself.

The digits are stored such that the most significant digit is at the head of the list.

题意：给出一个非负的数，用数组来表示这个数，比如说9999就是[9,9,9,9]当对这个数加一的时候，将这个数用数组的形式返回。

public class Solution {
    public int[] PlusOne(int[] digits) {
		int plus = 1;
		List<int> resultList = new List<int>();
		for (int i = digits.Length - 1; i >= 0; i--) {
			if (plus > 0) {
				digits[i] += 1;
				if (digits[i] >= 10) {
					digits[i] = digits[i] % 10;
				} else {
					plus--;
				}
			}
			resultList.Add(digits[i]);
			if (i == 0 && plus == 1) {
				resultList.Add(1);
			}
		}
		resultList.Reverse();
		return resultList.ToArray();
    }
}

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