1389. Create Target Array in the Given Order (E)

Create Target Array in the Given Order (E)

Given two arrays of integers nums and index. Your task is to create target array under the following rules:

• Initially target array is empty.
• From left to right read nums[i] and index[i], insert at index index[i] the value nums[i] in target array.
• Repeat the previous step until there are no elements to read in nums and index.

Return the target array.

It is guaranteed that the insertion operations will be valid.

Example 1:

Input: nums = [0,1,2,3,4], index = [0,1,2,2,1]
Output: [0,4,1,3,2]
Explanation:
nums       index     target
0            0        [0]
1            1        [0,1]
2            2        [0,1,2]
3            2        [0,1,3,2]
4            1        [0,4,1,3,2]

Example 2:

Input: nums = [1,2,3,4,0], index = [0,1,2,3,0]
Output: [0,1,2,3,4]
Explanation:
nums       index     target
1            0        [1]
2            1        [1,2]
3            2        [1,2,3]
4            3        [1,2,3,4]
0            0        [0,1,2,3,4]

Example 3:

Input: nums = [1], index = [0]
Output: [1]

Constraints:

• 1 <= nums.length, index.length <= 100
• nums.length == index.length
• 0 <= nums[i] <= 100
• 0 <= index[i] <= i

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题意

按照顺序，将nums[i]插入到index[i]下标处，返回新生成的数组。

思路

照做即可。

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代码实现

class Solution {
    public int[] createTargetArray(int[] nums, int[] index) {
        int[] ans = new int[nums.length];
        List<Integer> list = new ArrayList<>();
        
        for (int i = 0; i < nums.length; i++) {
            list.add(index[i], nums[i]);
        }
        
        for (int i = 0; i < nums.length; i++) {
            ans[i] = list. get(i);
        }
        
        return ans;
    }
}