OI-codes/LibreOJ/5/data/spj_cpp.cpp

#include <iostream>
#include <fstream>
using namespace std;

int main() {
    ifstream score_in("input");
    ifstream std("answer");
    ifstream usr("user_out");

    long long score, answer, user_answer;
    score_in >> score;
    std >> answer;
    usr >> user_answer;

    if (!usr) {
        cerr << "Failed to read any number from user output. Exiting." << endl;
        cout << 0;
    } else if (user_answer == 0) {
        cerr << "Commiserations. Score is " << score << "." << endl;
        cout << score;
    } else if (user_answer == answer) {
        cerr << "Correct!" << endl;
        cout << 100;
    } else {
        cerr << "Sorry, incorrect date." << endl;
        cout << 0;
    }
}