[LeetCode]Missing Number

Given an array containing n distinct numbers taken from

0, 1, 2, ..., n

,
find the one that is missing from the array.

For example,

Given nums =

[0, 1, 3]

return

2

.

Note:

Your algorithm should run in linear runtime complexity. Could you implement it using only constant extra space complexity?

Credits:

Special thanks to @jianchao.li.fighter for adding this problem and creating all test cases.

参考了别人的代码

code:

public class Solution268 {

	 public int missingNumber(int[] nums) {
	 
		 int sum=0;
		 for(int i=0; i<=nums.length; i++){
			 sum+=i;
		 }
		 for(int i:nums)
			 sum -=i;
		 return sum;
	 }
}