Contains Duplicate——Array

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本文介绍两种检查数组中是否存在重复元素的方法：一种是对数组排序后遍历比较相邻元素；另一种是利用集合特性对比数组长度和集合长度。

Given an array of integers, find if the array contains any duplicates. Your function should return true if any value appears at least twice in the array, and it should return false if every element is distinct.

class Solution(object):

    def containsDuplicate(self, nums):
        """
        :type nums: List[int]
        :rtype: bool
        """

        #method 1
        n_sort = sorted(nums)

        for i in range(len(n_sort)-1):
            if n_sort[i] == n_sort[i+1]:
                return True

        return False
        

        #method 2
        if nums is None or len(nums) <= 1: 
            return False
        s = set(nums)
        return len(nums) != len(s)