제출 #1231148

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1231148		sahasrad	Message (IOI24_message)	C++20	컴파일 에러	0 ms	0 KiB

message

#include <bits/stdc++.h>
using namespace std;

int mask = 65535;
vector<int> seq = {25226, 3520, 25771, 26888, 22115, 61712, 45676, 17833, 47399, 59849, 13569, 14556, 506, 21088, 18877, 48567};
int check = 10;

vector<bool> encode(vector<bool> &M, vector<bool> &C) {
    vector<bool> packet(31);

    int ptr = 0;
    for (int j = 0; j < 31; j++) {
        if (C[j]) continue;
        packet[j] = M[ptr++];
    }
    return packet;
}

void send_message(vector<bool> M, vector<bool> C) {
    if (!M.back()) {
        for (int i = 0; i < M.size(); i++) {
            M[i] = !M[i];
        }
        for (int i = 0; i < seq.size(); i++) {
            seq[i] ^= mask;
        }
    }

    for (int i = 0; i < check; i++) {
        int val = seq[i];
        vector<bool> bits(16);
        for (int j = 0; j < 16; j++) {
            bits[j] = val & 1;
            val >>= 1;
        }
        send_packet(encode(bits, C));
    }

    int packets = (M.size() + 15) / 16;
    for (int i = 0; i < packets; i++) {
        vector<bool> m(16);
        for (int j = 0; j < 16; j++) {
            int idx = i * 15 + j;
            if (idx >= M.size()) break;
            m[j] = M[idx];
        }
        send_packet(encode(m, C));
    }
}

vector<int> get_subseq(vector<vector<bool>> R) {
    vector<int> bits;
    int tokenPtr = 0;
    int ptr = 0;
    while (tokenPtr < 15 && ptr < 31) {
        bool works = true;
        for (int i = 0; i < check; i++) {
            if (R[i][ptr] != (seq[i] & (1 << tokenPtr)) > 0) {
                works = false;
                break;
            }
        }

        if (works) {
            bits.push_back(tokenPtr++);
        }
        ptr++;
    }
    return bits;
}

vector<bool> receive_message(vector<vector<bool>> R) {
    vector<int> bits = get_subseq(R);
    bool invert = false;
    if (bits.size() < 15) {
        invert = true;
        for (int i = 0; i < seq.size(); i++) {
            seq[i] ^= mask;
        }
        bits = get_subseq(R);
    }

    vector<bool> ans;
    for (int i = check; i < R.size(); i++) {
        for (int j = 0; j < 16; j++) {
            ans.push_back(R[i][bits[j]]);
        }
    }

    while (ans.back() == 0) {
        ans.pop_back();
    }

    if (invert) {
        for (int i = 0; i < ans.size(); i++) {
            ans[i] = !ans[i];
        }
    }

    return ans;
}

컴파일 시 표준 에러 (stderr) 메시지

message.cpp: In function 'void send_message(std::vector<bool>, std::vector<bool>)':
message.cpp:36:9: error: 'send_packet' was not declared in this scope
   36 |         send_packet(encode(bits, C));
      |         ^~~~~~~~~~~
message.cpp:47:9: error: 'send_packet' was not declared in this scope
   47 |         send_packet(encode(m, C));
      |         ^~~~~~~~~~~