問(wèn)題描述
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.
思路：剛開(kāi)始就用了雙層for循環(huán)孵睬，超時(shí)了
/**
* @param {number[]} nums
* @return {boolean}
*/
var containsDuplicate = function(nums) {
nums.sort();
for(var i = 0; i < nums.length-1; i++){
if(nums[i] == nums[i+1]){
return true;
}
}
return false;
};
