C#版(击败100.00%的提交) - Leetcode 744. 寻找比目标字母大的最小字母 - 题解

输入:
letters = ["c", "f", "j"]
target = "a"
输出: "c"

输入:
letters = ["c", "f", "j"]
target = "c"
输出: "f"

输入:
letters = ["c", "f", "j"]
target = "d"
输出: "f"

输入:
letters = ["c", "f", "j"]
target = "g"
输出: "j"

输入:
letters = ["c", "f", "j"]
target = "j"
输出: "c"

输入:
letters = ["c", "f", "j"]
target = "k"
输出: "c"

public class Solution
{
    public char NextGreatestLetter(char[] letters, char target)
    {
        List<char> list = letters.ToList();
        list.Add(target);
        list.Sort((x, y) => x.CompareTo(y));
        if (list.LastOrDefault() <= target)
            return list.FirstOrDefault();
        return list.FirstOrDefault(x => x > target);
    }
}