https://leetcode.com/problems/maximum-difference-between-even-and-odd-frequency-i

easy/maximum_difference_between_even_and_odd_frequency_i.py

@@ -0,0 +1,16 @@
+# https://leetcode.com/problems/maximum-difference-between-even-and-odd-frequency-i
+
+from typing import Counter
+
+class Solution:
+    def maxDifference(self, s: str) -> int:
+        c = Counter(s)
+        max_odd = float("-inf")
+        min_even = float("inf")
+        for k in c:
+            if c[k] % 2 == 1:
+                max_odd = max(max_odd, c[k])
+            else:
+                min_even = min(min_even, c[k])
+        return int(max_odd - min_even)
+