题解 | #提取不重复的整数#

#include <iostream>
#include <vector>
#include <array>
using namespace std;

int main() {
    int num;
    cin >> num;
    vector<int> ivec;
    array<int, 10> ia = {};
    while (num != 0) {
        auto result = num % 10;
        if (ia[result] == 0) {
            ia[result] = 1;
            ivec.push_back(result);
        }
        num /= 10;
    }
    for (auto i : ivec)
        cout << i;
    cout << endl;
    return 0;
}