Q217ContainDuplicate.cpp

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