Refine comments and time complexity notation

Update comments and time complexity in the code.

Author: 724thomas

leetcode3/최원준/3452. Sum of Good Numbers.py

@@ -0,0 +1,27 @@
+#
+
+'''
+1. 아이디어 :
+-
+
+2. 시간복잡도 :
+    O(n)
+
+3. 자료구조/알고리즘 :
+-
+
+'''
+class Solution:
+    def sumOfGoodNumbers(self, nums: List[int], k: int) -> int:
+        n = len(nums)
+        ans = 0
+
+        for i in range(n):
+            prev = nums[i-k] if i-k >= 0 else -float('inf')
+            next = nums[i+k] if i+k < n else -float('inf')
+            curr = nums[i]
+
+            if prev < curr > next:
+                ans += curr
+
+        return ans