题解 | #提取不重复的整数#
提取不重复的整数
https://www.nowcoder.com/practice/253986e66d114d378ae8de2e6c4577c1
简单呢
#include <iostream>
#include <unordered_set>
using namespace std;
int main()
{
string str;
cin >> str;
unordered_set<char> s;
for (int i = str.size()-1; i != -1; i--) {
if (s.find(str[i]) == s.end()) {
cout << str[i];
s.emplace(str[i]);
}
}
}