题解 | #提取不重复的整数#

#include <bits/stdc++.h>
using namespace std;
int main() {
    int num;
    int arr[10] = {0};
    while(cin >> num) {
        while(num >0) {
            int index = num%10;
            if(arr[index]==0) {
                arr[index] = 1;
                cout << index;
            }
            num = num/10;
        }
        cout << endl;
    }

    return 0;
}