217. Contains Duplicate Add to List（C++）

题目：

Given an array of integers（整数）, find if the array contains any duplicates（重复）. 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（不同）.

解答：

1. 用sort将数组排序（logN）
2. 依次比较相邻的两个

class Solution {public:   bool containsDuplicate(vector<int>& nums) {    sort(nums.begin(),nums.end());    for(int i=1;i<nums.size();i++){        if(nums[i]==nums[i-1]){            return true;        }    }    return false;}};//95.3%