From 56b1636eb63394c591a47e80a5f750bc9e22d5ab Mon Sep 17 00:00:00 2001
From: ivan <ivan1016017@gmail.com>
Date: Wed, 8 Oct 2025 04:31:36 -0600
Subject: [PATCH] adding update

---
 .../summary_ranges.py                         | 29 +++++++++++++++++++
 .../test_summary_ranges_round_20.py           | 26 +++++++++++++++++
 2 files changed, 55 insertions(+)
 create mode 100644 src/my_project/interviews/top_150_questions_round_20/summary_ranges.py
 create mode 100644 tests/test_150_questions_round_20/test_summary_ranges_round_20.py

diff --git a/src/my_project/interviews/top_150_questions_round_20/summary_ranges.py b/src/my_project/interviews/top_150_questions_round_20/summary_ranges.py
new file mode 100644
index 00000000..8cb378c1
--- /dev/null
+++ b/src/my_project/interviews/top_150_questions_round_20/summary_ranges.py
@@ -0,0 +1,29 @@
+from typing import List, Union, Collection, Mapping, Optional
+from abc import ABC, abstractmethod
+
+class Solution:
+    def summaryRanges(self, nums: List[int]) -> List[str]:
+
+        len_nums = len(nums)
+
+        if len_nums == 0:
+            return []
+        elif len_nums == 1: 
+            return [f'{nums[0]}']
+        else: 
+            answer = list()
+
+            pre = start = nums[0]
+
+            for i in nums[1:]:
+
+                if i - pre > 1: 
+                    answer.append(f'{start}->{pre}' if pre-start > 0 else 
+                                  f'{start}')
+                    start = i 
+
+                pre = i 
+
+            answer.append(f'{start}->{pre}' if pre-start > 0 else f'{start}')
+
+            return answer 
\ No newline at end of file
diff --git a/tests/test_150_questions_round_20/test_summary_ranges_round_20.py b/tests/test_150_questions_round_20/test_summary_ranges_round_20.py
new file mode 100644
index 00000000..141d6a71
--- /dev/null
+++ b/tests/test_150_questions_round_20/test_summary_ranges_round_20.py
@@ -0,0 +1,26 @@
+import unittest
+from src.my_project.interviews.top_150_questions_round_20\
+.summary_ranges import Solution
+
+class SummaryRangesTestCase(unittest.TestCase):
+
+    def test_empty(self):
+        solution = Solution()
+        output = solution.summaryRanges(nums=[])
+        target = []
+        self.assertEqual(target, output)
+
+    def test_single_element(self):
+        solution = Solution()
+        output = solution.summaryRanges(nums=[1])
+        target = ['1']
+        self.assertEqual(target, output)
+
+    def test_several_elements(self):
+        solution = Solution()
+        output = solution.summaryRanges(nums=[0,1,2,4,5,7])
+        target = ["0->2","4->5","7"]
+        for k, v in enumerate(target):
+            self.assertEqual(v, output[k])  
+
+            
\ No newline at end of file