C++

1/**
2 * Runtime: 0 ms, faster than 100.00%
3 * Memory Usage: 8.8 MB, less than 34.60%
4 */
5class Solution {
6  public:
7    vector<int> createTargetArray(vector<int>& nums, vector<int>& index) {
8      vector<int> result;
9
10      for (int i=0; i<index.size(); ++i)
11      {
12        auto it = result.begin();
13        result.insert(it + index[i], nums[i]);
14      }
15
16
17      return result;
18    }
19};

JavaScript

1/**
2 * Runtime: 80 ms, faster than 47.00%
3 * Memory Usage: 38.9 MB, less than 23.33%
4 */
5var createTargetArray = function(nums, index) {
6  let result = []
7  for(let i=0; i<index.length; ++i) {
8    result.splice(index[i], 0, nums[i]);
9  }
10
11  return result;
12};

Ruby

1# Runtime: 40 ms, faster than 90.00% 
2# Memory Usage: 210 MB, less than 10.00% 
3def create_target_array(nums, index)
4  result = []
5  for i in (0...index.size) do
6    result.insert(index[i], nums[i]) 
7  end
8
9  result
10end