Submission #1189541

#	Time	Username	Problem	Language	Result	Execution time	Memory
1189541		tamyte	Flight to the Ford (BOI22_communication)	C++20	0 / 100	266 ms	2856 KiB

communication

#include <bits/stdc++.h>

using namespace std;
// #define DEBUG
#ifndef DEBUG
#include "communication.h"
#endif
random_device rd;
mt19937 rng(rd());
#ifdef DEBUG
queue<int> signals;
int receive() {
    int now = signals.front();
    signals.pop();
    return now;
}
int send(int i) {
    int now = rng() % 2;
    signals.push(i);
    // cout << i << " = " << (i ^ now) << endl;
    return (i ^ now);
}
#endif

void encode(int N, int X) {
    vector<int> bits;
    for (int i = 0; i < 2; ++i) {
        bits.push_back((X >> i & 1));
    }
    for (int i = 0; i < 250 / 2; ++i) {
        for (int j = 0; j < 2; ++j) {
            send(bits[j]);
        }
    }
}

std::pair<int, int> decode(int N) {
    vector<int> cnt(4);
    for (int i = 0; i < 250 / 2; ++i) {
        int now = 0;
        for (int j = 0; j < 2; ++j) {
            if (receive()) {
                now += (1 << j);
            }
        }
        cnt[now]++;
    }
    pair<int, int> res = {0, 0};
    for (int i = 1; i <= 3; ++i) {
        if (cnt[res.first] < cnt[i]) {
            swap(res.first, res.second);
            res.first = i;
        } else if (cnt[res.second] < cnt[i]) {
            res.second = i;
        }
    }
    return res;
}

#ifdef DEBUG
int main() {
    int N = 3, X = 2;
    
    // cout << now.first << " " << now.second << endl;
    
    for (int i = 0; i < 1000; ++i) {
        X = rng() % N + 1;
        encode(N, X);
        auto now = decode(N);
        if (now.first != X && now.second != X) {
            cout << "WA!\n";
            return 0;
        }
    }
    cout << "AC!\n";
}
#endif

• Subtask 1: 0 / 15
• Subtask 2: 0 / 85