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.
input: 給一個整數的陣列
output: 看這個陣列有沒有重覆的值
Example 1:
Input: [1,2,3,1]
Output: true
Example 2:
Input: [1,2,3,4]
Output: false
Example 3:
Input: [1,1,1,3,3,4,3,2,4,2]
Output: true
*/
/**
* @param {number[]} nums
* @return {boolean}
*/
var containsDuplicate = function(nums) {
};
Edge Case
可能有負數或零
怎麼解
題目有提到 contains any duplicates，所以我會用 Set
去比較 Set.size 跟原來的 Array 長度一不一樣
var containsDuplicate = function(nums) {
return new Set(nums).size < nums.length;
};