Find an array duplicate numbers.
All numbers in an array of length nums n's are in the range of 0 ~ n-1. Some digital array is duplicated, but do not know how many numbers repeat, do not know each number was repeated several times. Please find an array of any one of the duplicate numbers.
Example 1:
Input:
[2, 3, 1, 0, 2, 5, 3]
Output: 2 or 3
limit:
2 <= n <= 100000
class Solution:
def findRepeatNumber(self, nums: List[int]) -> int:
a = nums.sort()
before = nums[0]
for i in range (1,len(nums)):
if before == nums[i]:
return before
before = nums[i]
