우주의WouldYou

#include <vector>
using namespace std;

int solution(vector<int> nums)
{
	int answer = 0;
    vector<int> total_vec(2000000, 0);
    int total = nums.size() / 2;
    for(int i=0; i < nums.size();i++){
        total_vec[nums[i]]++;
    }
    for(int i =0; i < total_vec.size();i++){
        if(total_vec[i] != 0){
            answer ++;
        }
        if(answer == total)
            break;
    }
	return answer;
}