Contains Duplicate
Difficulty: EasyTopic: ArrayHash TableSortingLeetcode:217.Contains DuplicateGiven an integer array nums, return true if any value appears at least twice in the array, and return false if every element is distinct.
Example 1:
Input: nums = [1,2,3,1]
Output: true
Example 2:
Input: nums = [1,2,3,4]
Output: false
Example 3:
Input: nums = [1,1,1,3,3,4,3,2,4,2]
Output: true
Constraints:
1 <= nums.length <= 105-109 <= nums[i] <= 109
Solution
write solution in here
/**
* @param {number[]} nums
* @return {boolean}
*/
var containsDuplicate = function(nums) {
const exist = new Set()
for(let i = 0; i < nums.length; i++) {
if (exist.has(nums[i])) return true
exist.add(nums[i])
}
return false
};