462. Minimum Moves to Equal Array Elements II

Given a non-empty integer array, find the minimum number of moves required to make all array elements equal, where a move is incrementing a selected element by 1 or decrementing a selected element by 1.

You may assume the array‘s length is at most 10,000.

Example:

Input:
[1,2,3]

Output:
2

Explanation:
Only two moves are needed (remember each move increments or decrements one element):

[1,2,3]  =>  [2,2,3]  =>  [2,2,2]

 1 class Solution {
 2 public:
 3     int minMoves2(vector<int>& nums) {
 4         int len = nums.size();
 5         int sum = 0;
 6         sort(nums.begin(), nums.end());
 7         for (int i = 0;i < len;i++)
 8         {
 9             if (nums[i] != nums[len / 2])
10             {
11                 sum += abs(nums[i] - nums[len / 2]);
12             }
13         }
14         return sum;
15     }
16 };