diff --git a/Books/代码随想录/代码模版.md b/Books/代码随想录/代码模版.md
index 6629d46..744e183 100644
--- a/Books/代码随想录/代码模版.md
+++ b/Books/代码随想录/代码模版.md
@@ -34,3 +34,27 @@ def right_bound(nums, target):
     return right if right >= 0 and nums[right] == target else -1
 
 ```
+## 滑动窗口
+```python
+def lengthOfLongestSubstring(s: str) -> int:
+    left = 0
+    window = {}
+    result = 0
+
+    for right in range(len(s)):
+        char_right = s[right]
+        window[char_right] = window.get(char_right, 0) + 1
+
+        # 当窗口中有重复字符时，收缩窗口
+        while window[char_right] > 1:
+            char_left = s[left]
+            window[char_left] -= 1
+            if window[char_left] == 0:
+                del window[char_left]
+            left += 1
+
+        result = max(result, right - left + 1)
+
+    return result
+
+```
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