[programming question] clear random number

Mingming generated a 1 To 500 Random integer between . Please delete the duplicate numbers , That is, only one of the same numbers is retained , Take out the rest of the same number , And then sort the numbers from small to large , Output according to the arranged order .

Data range ：  , The size of the input number meets  

Input description :

 In the first line, enter the number of random integers  N .
 Next  N  Line enter an integer for each line , Represents the random number clearly generated .
 For the specific format, please refer to the following " Example ".

Output description :

Output multiple lines , Indicates the result of input data processing

Input example 1:

3
2
2
1

Output example 1:

1
2

Example illustrate 1:

 Enter an explanation ：
 The first number is 3, That's what this little example is about N=3, It's computer generated 3 individual 1 To 500 Random integer between , Next, a random number per line , common 3 That's ok , That's what it is 3 A random number is ：
2
2
1
 So the output of the sample is ：
1
2    

import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int N = sc.nextInt();
        boolean[] arr = new boolean[501];
        for(int i = 0; i < N; i++) {
            arr[sc.nextInt()] = true;
        }
        for(int i = 1; i < 501; i++) {
            if(arr[i]) {
                System.out.println(i);
            }
        }
    }
}

#include <cstdio>
#include <vector>
#include <algorithm>
using namespace std;
int main() {
    int N;
    scanf("%d", &N);
    vector<int> ans(N);
    for(int i = 0; i < N; i++) {
        scanf("%d", &ans[i]);
    }
    sort(ans.begin(), ans.end());
    printf("%d\n", ans[0]);
    int pre = ans[0];
    for(int i = 1; i < N; i++) {
        if(pre != ans[i]) {
            printf("%d\n", ans[i]);
            pre = ans[i];
        }
    }
    return 0;
}