LeetCode 217 Contains Duplicate

LeetCode 217 Contains Duplicate

一种C++实现，先排序，再比较相邻值是否相等：

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

用时40ms