题解 | #明明的随机数#

# include<stdio.h>
# include<unordered_map>
# include<vector>

using namespace std;

int main(){
    unordered_map<int, int> mp;
    int N;
    cin >> N;
    int a;
    for(int i=0; i<N; i++){
        cin >> a;
        if(mp[a] > 0){
            continue;
        }else{
            mp[a]++;
        }
    }
    for(int i=1;i<=500;i++){
        if(mp[i] != 0){
            cout << i << endl;
        }
    }
    return 0;
}