Commit 89af38d

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Add 287 find theduplicate number Solution in python (#107)

* Add solution for 278-firstBadVersion. * Add python solution for 287_FindTheDuplicateNumber * Remove extra new line.

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	`1`	`+from typing import List`
	`2`	`+`
	`3`	`+class Solution:`
	`4`	`+ def _get_count_of_equal_or_less(self, num_arr: List[int], value: int) -> int:`
	`5`	`+ return len([num for num in num_arr if num <= value])`
	`6`	`+`
	`7`	`+ def findDuplicate(self, nums: List[int]) -> int:`
	`8`	`+ left = 1`
	`9`	`+ right = len(nums) - 1`
	`10`	`+`
	`11`	`+ duplicate_number = -1`
	`12`	`+`
	`13`	`+ while left <= right:`
	`14`	`+ mid = (left + right)//2`
	`15`	`+`
	`16`	`+ equal_or_less_count = self._get_count_of_equal_or_less(num_arr=nums, value=mid)`
	`17`	`+`
	`18`	`+ if equal_or_less_count > mid:`
	`19`	`+ right = mid - 1`
	`20`	`+ duplicate_number = mid`
	`21`	`+ else:`
	`22`	`+ left = mid + 1`
	`23`	`+`
	`24`	`+ return duplicate_number`
	`25`	`+`

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