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Create leetcode645.py

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	`1`	`+from typing import List`
	`2`	`+`
	`3`	`+class Solution:`
	`4`	`+ def findErrorNums(self, nums: List[int]) -> List[int]:`
	`5`	`+ res = list()`
	`6`	`+ nums.sort()`
	`7`	`+ stdList = range(1, len(nums) + 1) # len(nums) = n`
	`8`	`+ repeatedNum = sum(nums) - sum(set(nums))`
	`9`	`+ res.append(repeatedNum)`
	`10`	`+ missingNum = (set(stdList) - set(nums)).pop()`
	`11`	`+ res.append(missingNum)`
	`12`	`+ return res`
	`13`	`+`
	`14`	`+# below is testing`
	`15`	`+sol = Solution()`
	`16`	`+print(sol.findErrorNums([4,2, 1,2]))`

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