@@ -0,0 +1,248 @@
+class Solution(object):%0A    def missingNumber(self, nums):%0A        %22%22%22%0A        :type nums: List%5Bint%5D%0A        :rtype: int%0A        %22%22%22%0A        n = len(nums)%0A        s = 0%0A        for num in nums:%0A            s += num%0A        return n * (n+1) / 2 - s%0A

add solution for Missing Number