problem 128, longest consecutive sequence

python/problem_128/solution1.py

@@ -0,0 +1,27 @@
+from typing import List
+
+class Solution:
+    def longestConsecutive(self, nums: List[int]) -> int:
+        if len(nums) <= 1:
+            return len(nums)
+
+        nums.sort()
+
+        longest = 1
+        
+        temp_longest = 1
+        prev = nums[0]
+
+        for item in nums[1:]:
+            if item == prev + 1:
+                temp_longest += 1
+            elif item == prev:
+                temp_longest += 0
+            else:
+                temp_longest = 1
+            prev = item
+
+            if temp_longest > longest:
+                longest = temp_longest
+
+        return longest