diff --git a/228-240525-pass/main.py b/228-240525-pass/main.py
new file mode 100644
index 0000000..37f4f63
--- /dev/null
+++ b/228-240525-pass/main.py
@@ -0,0 +1,29 @@
+class Solution:
+    def summaryRanges(self, nums: list[int]) -> list[str]:
+        if len(nums) == 0:
+            return []
+        rlt = []
+        start = nums[0]
+        end = start
+        last = start
+        for idx, ele in enumerate(nums[1:]):
+            if ele == last + 1:
+                end = ele
+            else:
+                rlt.append((start, end))
+                start = ele
+                end = ele
+            last = ele
+        rlt.append((start,end))
+        str_rlt = []
+        for ele in rlt:
+            if ele[0] == ele[1]:
+                str_rlt.append(f"{ele[0]}")
+            else:
+                str_rlt.append(f"{ele[0]}->{ele[1]}")
+        return str_rlt
+
+sol = Solution()
+print(sol.summaryRanges([0,1,2,4,5,7]))
+print(sol.summaryRanges([0,2,3,4,6,8,9]))
+                
\ No newline at end of file