Submission #680372

#	Time	Username	Problem	Language	Result	Execution time	Memory
680372		bashkort	Crossing (JOI21_crossing)	C++17	26 / 100	7034 ms	4276 KiB

Main

#include <bits/stdc++.h>

using namespace std;
using ll = long long;

string cross(string &a, string &b) {
    string res(a.size(), 'a');
    for (int i = 0; i < a.size(); ++i) {
        if (a[i] == b[i]) {
            res[i] = a[i];
        } else {
            res[i] = 'J' ^ 'O' ^ 'I' ^ a[i] ^ b[i];
        }
    }
    return res;
}

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    int n;
    cin >> n;

    string A, B, C;
    cin >> A >> B >> C;

    unordered_set<string> every{A, B, C};

    queue<string> qu;
    qu.push(A), qu.push(B), qu.push(C);

    while (!qu.empty()) {
        string s = qu.front();
        qu.pop();

        for (string to : every) {
            string res = cross(s, to);

            if (!every.count(res)) {
                qu.push(res);
                every.insert(res);
            }
        }
    }

    int q;
    cin >> q;

    string t;
    cin >> t;

    cout << (every.count(t) ? "Yes\n" : "No\n");

    while (q--) {
        int l, r;
        char c;
        cin >> l >> r >> c;

        --l;
        for (int i = l; i < r; ++i) {
            t[i] = c;
        }

        cout << (every.count(t) ? "Yes\n" : "No\n");
    }

    return 0;
}

Compilation message (stderr)

Main.cpp: In function 'std::string cross(std::string&, std::string&)':
Main.cpp:8:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    8 |     for (int i = 0; i < a.size(); ++i) {
      |                     ~~^~~~~~~~~~

• Subtask 1: 3 / 3
• Subtask 2: 0 / 23
• Subtask 3: 23 / 23
• Subtask 4: 0 / 51