🌵217. Contains Duplicate
https://leetcode.com/problems/contains-duplicate/
js
/**
* @param {number[]} nums
* @return {boolean}
*/
var containsDuplicate = function(nums) {
var lookup = {};
for (var i = 0; i < nums.length; i++) {
var num = nums[i];
if (lookup[num]) {
return true;
}
lookup[num] = true;
}
return false;
};
// or
/**
* @param {number[]} nums
* @return {boolean}
*/
var containsDuplicate_2 = function(nums) {
return nums.length > new Set(nums).size;
};py
class Solution(object):
def containsDuplicate(self, nums):
"""
:type nums: List[int]
:rtype: bool
"""
return len(nums) > len(set(nums))