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/*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*/

/**

* @param {number[]} nums

* @return {number}

*/

var missingNumber = function(nums) {

len = nums.length

total = len * (len + 1) / 2

for(i=0; i<len; i++)

total -= nums[i]

return total

};