[Leet Code - eazy] 1389. 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

 

나의 풀이

 

/**
 * @param {number[]} nums
 * @param {number[]} index
 * @return {number[]}
 */
var createTargetArray = function(nums, index) {
    const answer = [];
    
    for (let i = 0; i < index.length; i++) {
        answer.splice(index[i], 0, nums[i]) // splice를 이용하면 index[i] 부터, num까지 인데 0을 넣으면 자르는 값 없이 nums [i]값만 추가됨
    }
    
    return answer
 
    // output 
    //[ 0 ]
    // [ 0, 1 ]
    // [ 0, 1, 2 ]
    // [ 0, 1, 3, 2 ]
    // [ 0, 4, 1, 3, 2 ]
};

 

코드를 풀며 느낀 점

 

- Array.splice()에 대해서 조금 더 잘 알게 된 것 같습니다.