change into counter

solution/2200-2299/2206.Divide Array Into Equal Pairs/README_EN.md

@@ -54,12 +54,7 @@ The first step is to count the number of times each number appears in the array.
 ```python
 class Solution:
     def divideArray(self, nums: List[int]) -> bool:
-        dic = {}
-        for num in nums:
-            if num in dic:
-                dic[num] += 1
-            else:
-                dic[num] = 1
+        dic = Counter(nums)
         for num in dic:
             if dic[num] % 2 != 0:
                 return False

solution/2200-2299/2206.Divide Array Into Equal Pairs/Solution.py

@@ -1,11 +1,6 @@
 class Solution:
     def divideArray(self, nums: List[int]) -> bool:
-        dic = {}
-        for num in nums:
-            if num in dic:
-                dic[num] += 1
-            else:
-                dic[num] = 1
+        dic = Counter(nums)
         for num in dic:
             if dic[num] % 2 != 0:
                 return False