adding longestConsecutive

Author: daiyongg-kim

longest-consecutive-sequence/daiyongg-kim.py

@@ -0,0 +1,13 @@
+class Solution:
+    def longestConsecutive(self, nums: List[int]) -> int:
+        my_set = set(nums)
+        longest = 0
+        length = 1
+        for num in my_set:
+            if num - 1 not in my_set:
+                length = 1
+                while num + length in my_set:
+                    length += 1
+                longest = max (longest, length)
+
+        return longest