Leetcode1389. Create Target Array in the Given Order

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

  ArrayList 可以直接insert 在第i个位置插入一个值，所以直接一次循环，然后再放入数组中即可。就是用ArrayList的特性；

Runtime0 ms

Beats

100%

Memory40.6 MB

Beats

91.4%