LeetCode | 1389. Create Target Array in the Given Order按既定顺序创建目标数组【Python】
LeetCode 1389. Create Target Array in the Given Order按既定顺序创建目标数组【Easy】【Python】【数组】
Problem
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 valuenums[i]
in target array. - Repeat the previous step until there are no elements to read in
nums
andindex.
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
问题
给你两个整数数组 nums 和 index。你需要按照以下规则创建目标数组:
- 目标数组 target 最初为空。
- 按从左到右的顺序依次读取 nums[i] 和 index[i],在 target 数组中的下标 index[i] 处插入值 nums[i] 。
- 重复上一步,直到在 nums 和 index 中都没有要读取的元素。
请你返回目标数组。
题目保证数字插入位置总是存在。
示例 1:
输入:nums = [0,1,2,3,4], index = [0,1,2,2,1]
输出:[0,4,1,3,2]
解释:
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]
示例 2:
输入:nums = [1,2,3,4,0], index = [0,1,2,3,0]
输出:[0,1,2,3,4]
解释:
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]
示例 3:
输入:nums = [1], index = [0]
输出:[1]
提示:
1 <= nums.length, index.length <= 100
nums.length == index.length
0 <= nums[i] <= 100
0 <= index[i] <= i
思路
数组
时间复杂度: O(n),n 为 index 长度,nums 长度和 index 相同。
空间复杂度: O(n),n 为 index 长度。
Python3代码
from typing import List
class Solution:
def createTargetArray(self, nums: List[int], index: List[int]) -> List[int]:
target = []
for i in range(len(index)):
target.insert(index[i], nums[i]) # insert(位置, 值)
return target
GitHub链接
最怕一生碌碌无为,还说平凡难能可贵。