MissingInteger【看答案了】

 1         /// <summary>
 2         /// Solution
 3         /// 通过率 100%
 4         /// </summary>
 5         /// <param name="A"></param>
 6         /// <returns></returns>
 7         public static int solution(int[] A)
 8         {
 9             int result = 1;
10             Array.Sort(A);
11             foreach (int num in A)
12             {
13                 if (num == result)
14                     result++;
15             }
16             return result;
17         }