LeetCode 217. Contains Duplicate

​​题目​​

class Solution {
public:
    map<int,int>m;
    bool containsDuplicate(vector<int>& nums) {
        
        for(int i=0;i<nums.size();i++)
        {
            if(m[nums[i]]!=0)
            {
                return true;
            }
            else
            {
                m[nums[i]]=1;
            }
        }
        return false;
    }
};