#1313

Decompress Run-Length Encoded List

newbie · 180 · lc easy +15 · verified · 86.2% accepted · 1,343 likes · top 97%

Description

You are given an integer list nums encoded in run-length format. Consecutive element pairs form [freq, val] = [nums[2*i], nums[2*i+1]] for each i >= 0. Each pair expands to a sublist of freq copies of val. Concatenate all such sublists left to right and return the decoded list.

Example 1:

Input: nums = [1,2,3,4]

Output: [2,4,4,4]

Explanation: The first pair [1,2] means we have freq = 1 and val = 2 so we generate the array [2].

The second pair [3,4] means we have freq = 3 and val = 4 so we generate [4,4,4].

At the end the concatenation [2] + [4,4,4] is [2,4,4,4].

Example 2:

Input: nums = [1,1,2,3]

Output: [1,3,3]

Code

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class Solution:
    def decompressRLElist(self, nums: List[int]) -> List[int]:

class Solution:
    def decompressRLElist(self, nums: List[int]) -> List[int]: