HJ9题解 | #提取不重复的整数#

#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
using namespace std;

int main() {
    string input;
    getline(cin, input);
    vector<char> vec;
    for (int i = input.size() - 1; i >= 0; i--) {
        if (find(vec.begin(), vec.end(), input[i]) == vec.end()) {
            vec.push_back(input[i]);
        }
    }
    for (auto it : vec) {
        cout << it;
    }
}