leetcode217

public class Solution {
    public bool ContainsDuplicate(int[] nums) {
        var list = nums.Distinct();
            if (list.Count() == nums.Length)
            {
                return false;
            }
            else
            {
                return true;
            }
    }
}

https://leetcode.com/problems/contains-duplicate/#/description

 

python的实现：

class Solution:
    def containsDuplicate(self, nums: 'List[int]') -> bool:
        dic = {}
        for n in nums:
            if n not in dic:
                dic[n] = 1
            else:
                return True
        return False