Update 0718.最长重复子数组.md

problems/0718.最长重复子数组.md

@@ -158,6 +158,36 @@ Java：
 
 Python：
 
+> 动态规划：
+```python
+class Solution:
+    def findLength(self, A: List[int], B: List[int]) -> int:
+        dp = [[0] * (len(B)+1) for _ in range(len(A)+1)]
+        result = 0
+        for i in range(1, len(A)+1):
+            for j in range(1, len(B)+1):
+                if A[i-1] == B[j-1]:
+                    dp[i][j] = dp[i-1][j-1] + 1
+                result = max(result, dp[i][j])
+        return result
+```
+
+> 动态规划：滚动数组
+```python
+class Solution:
+    def findLength(self, A: List[int], B: List[int]) -> int:
+        dp = [0] * (len(B) + 1)
+        result = 0
+        for i in range(1, len(A)+1):
+            for j in range(len(B), 0, -1):
+                if A[i-1] == B[j-1]:
+                    dp[j] = dp[j-1] + 1
+                else:
+                    dp[j] = 0 #注意这里不相等的时候要有赋0的操作
+                result = max(result, dp[j])
+        return result
+```
+
 
 Go：
 ```Go