백준 1972번 놀라운 문자열 C++

https://www.acmicpc.net/problem/1972

1972번: 놀라운 문자열

 

#include <iostream>
#include <string>
#include <vector>
#include <math.h>
#include <algorithm>
#include <utility>
#include <stack>
#include <queue>
#include <math.h>
#include <set>
#include <map>
#include <list>
#include <unordered_map>
#include <unordered_set>
#include <iomanip>
#include <limits.h>

using namespace std;
using int64 = long long;

string str;

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);

    while (true) {
        cin >> str;
        if (str == "*") break;
        bool surprise = true;
        for (int i = 1; i < str.length(); i++) {
            unordered_set<string> us;
            for (int j = 0; j < str.length(); j++) {
                if (j + i >= str.length()) break;
                string tmp = "";
                tmp += str[j];
                tmp += str[j + i];
                auto it = us.find(tmp);
                if (it == us.end()) us.insert(tmp);
                else surprise = false;
            }
        }
        if (surprise) {
            cout << str <<" is surprising.\n";
        }
        else {
            cout << str << " is NOT surprising.\n";
        }
    }
}