蓝桥杯算法提高VIP-删除重复元素-题解(C++代码) by Zfans.

#include <iostream>
#include <cstring>
using namespace std;
string DelPack(string str) {
    string ans;
    int c[128];
    memset(c, 0, sizeof(c));
    for (int i = 0; i < int(str.size()); ++i) {
        if (c[str[i]] == 0) {
            c[str[i]] = 1;
            ans += str[i];
        } else if (c[str[i]] == 1) {
            ans.erase(ans.find(str[i]), 1);
            c[str[i]] = 2;
        }
    }
    return ans;
}
int main() {
    string str;
    cin >> str;
    cout << DelPack(str) << endl;
    return 0;
}