蟲匯聚之所

題目：

We are given a list nums of integers representing a list compressed with run-length encoding. Consider each adjacent pair of elements [freq, val] = [nums[2*i], nums[2*i+1]] (with i >= 0). For each such pair, there are freq elements with value val concatenated in a sublist. Concatenate all the sublists from left to right to generate the decompressed list. Return the decompressed list.

解題：

提供一個List第一個數字代表數字，第二個數字代表第一個數字重複個數 根據以上方法新增一個List 使用for兩個兩個取i，使用i+1作為新增元素個數即可 append會做為list插入，本題要求為合併list故使用extend

python code:

class Solution:
    def decompressRLElist(self, nums: List[int]) -> List[int]:
        ans=[]
        for i in range(0,len(nums),2):
            ans.extend([nums[i+1]]*nums[i])
        return ans