Merge pull request #2 from quillanqonline/1313

Decompress Run-Length Encoded List

1313/README.md

@@ -0,0 +1,26 @@
+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.
+
+
+
+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]
+
+
+Constraints:
+
+2 <= nums.length <= 100
+nums.length % 2 == 0
+1 <= nums[i] <= 100

1313/Solution.py

@@ -0,0 +1,14 @@
+class Solution:
+    def decompressRLElist(self, nums: List[int]) -> List[int]:
+        remainingList = nums
+        output = []
+        while remainingList:
+            if len(remainingList) >= 2:
+                frequency = remainingList[0]
+                value = remainingList[1]
+                remainingList = remainingList[2:]
+
+                for i in range(frequency):
+                    output.append(value)
+
+        return output