olymp day 1

// Example program
#include <iostream>
#include <string>
#include <unordered_map>
#include <vector>

using namespace std;

int main() {
    FILE *f, *d;
    f = fopen("in.txt", "r");

    d = fopen("OUT.TXT", "w");

    unordered_map<char, int> map;
    vector<char> str1;

    char sym;

    bool map_work = true;
    while (true) {
        if (feof(f)) { break; }
        sym = fgetc(f);

        cout << sym << endl;
        if (sym == '\n') {
            map_work = false;
        }

        if (map_work) {
            if (map.find(sym) == map.end()) {
                map.insert(pair<char, int>(sym, 1));
                str1.push_back(sym);
            } else { map[sym] += 1; }

        } else if (map.find(sym) != map.end()) { map[sym] -= 1; }
    }

    bool good = true;
    for (int i = 0; i < str1.size(); i++) {
        if (map[str1[i]] > 0) {
            good = false;
            break;
        };
    }

    if (good) { fprintf(d, "Да"); }
    else { fprintf(d, "Нет"); }

    fclose(f);
    fclose(d);
    return 0;
}