Create smallest-missing-integer-greater-than-sequential-prefix-sum.py

Author: kamyu104

Python/smallest-missing-integer-greater-than-sequential-prefix-sum.py

@@ -0,0 +1,19 @@
+# Time:  O(n)
+# Space: O(n)
+
+# hash table
+class Solution(object):
+    def missingInteger(self, nums):
+        """
+        :type nums: List[int]
+        :rtype: int
+        """
+        total = nums[0]
+        for i in xrange(1, len(nums)):
+            if nums[i] != nums[i-1]+1:
+                break
+            total += nums[i]
+        lookup = set(nums)
+        while total in lookup:
+            total += 1
+        return total