update赎金信，添加了使用数组作为哈希表和使用defaultdict两种写法

problems/0383.赎金信.md

@@ -135,8 +135,52 @@ class Solution {
 
 ```
 
-Python：
-```py
+Python写法一（使用数组作为哈希表）：
+
+```python
+class Solution:
+    def canConstruct(self, ransomNote: str, magazine: str) -> bool:
+
+        arr = [0] * 26
+
+        for x in magazine:
+            arr[ord(x) - ord('a')] += 1
+
+        for x in ransomNote:
+            if arr[ord(x) - ord('a')] == 0:
+                return False
+            else:
+                arr[ord(x) - ord('a')] -= 1
+        
+        return True
+```
+
+Python写法二（使用defaultdict）：
+
+```python
+class Solution:
+    def canConstruct(self, ransomNote: str, magazine: str) -> bool:
+
+        from collections import defaultdict
+
+        hashmap = defaultdict(int)
+
+        for x in magazine:
+            hashmap[x] += 1
+
+        for x in ransomNote:
+            value = hashmap.get(x)
+            if value is None or value == 0:
+                return False
+            else:
+                hashmap[x] -= 1
+
+        return True
+```
+
+Python写法三：
+
+```python
 class Solution(object):
     def canConstruct(self, ransomNote, magazine):
         """
@@ -166,6 +210,7 @@ class Solution(object):
 ```
 
 Go：
+
 ```go
 func canConstruct(ransomNote string, magazine string) bool {
     record := make([]int, 26)