LeetCode 217. Contains Duplicate

题目：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

 

1，暴力破解

bool containsDuplicate(int* nums, int numsSize) 
{
    int i,j,temp;
    temp = 1;
    for(i = 0;i < numsSize;i++)
    {
        for(j = temp;j < numsSize;j++)
        {
            if(nums[i] == nums[j])
            {
                return true;
            }
        }
        temp++;
    }
    return false;     
}

 2,巧解抄录（棒呆）

class Solution {
  public:
    bool containsDuplicate(vector<int>& nums) {
        return set<int>(nums.begin(), nums.end()).size() < nums.size();
    }
};