Given an array containing n distinct numbers taken from 0, 1, 2, ..., n, find the one that is missing from the array.
Example 1
Input: [3,0,1] Output: 2
Example 2
Input: [9,6,4,2,3,5,7,0,1] Output: 8
1 public class Solution { 2 public int MissingNumber(int[] nums) { 3 int n = nums.Length; 4 5 for (int i = 0; i < nums.Length; i++) 6 { 7 n ^= i ^ nums[i]; 8 } 9 10 return n; 11 } 12 }
原文：http://www.cnblogs.com/liangmou/p/7992171.html