Add Python solution for maxFreeTime function

Author: yanglbme

solution/3400-3499/3440.Reschedule Meetings for Maximum Free Time II/README_EN.md

@@ -109,7 +109,50 @@ tags:
 #### Python3
 
 ```python
-
+class Solution:
+    def maxFreeTime(
+        self, eventTime: int, startTime: List[int], endTime: List[int]
+    ) -> int:
+        n = len(startTime)
+        res = 0
+
+        left_gaps = [0] * n
+        left_gaps[0] = startTime[0]
+        for meet in range(1, n):
+            left_gaps[meet] = max(
+                left_gaps[meet - 1], startTime[meet] - endTime[meet - 1]
+            )
+
+        right_gaps = [0] * n
+        right_gaps[n - 1] = eventTime - endTime[-1]
+        for meet in range(n - 2, -1, -1):
+            right_gaps[meet] = max(
+                right_gaps[meet + 1], startTime[meet + 1] - endTime[meet]
+            )
+
+        for meet in range(n):
+            left_gap = (
+                left_gaps[meet] if meet == 0 else startTime[meet] - endTime[meet - 1]
+            )
+            right_gap = (
+                right_gaps[meet]
+                if meet == n - 1
+                else startTime[meet + 1] - endTime[meet]
+            )
+
+            interval = 0
+
+            if (
+                meet != 0
+                and left_gaps[meet - 1] >= (endTime[meet] - startTime[meet])
+                or meet != n - 1
+                and right_gaps[meet + 1] >= (endTime[meet] - startTime[meet])
+            ):
+                interval = endTime[meet] - startTime[meet]
+
+            res = max(res, left_gap + interval + right_gap)
+
+        return res
 ```
 
 #### Java