Submission #599540

#	Time	Username	Problem	Language	Result	Execution time	Memory
599540		fvogel499	Flight to the Ford (BOI22_communication)	C++17	0 / 100	3 ms	328 KiB

communication

#include <cassert>
#include"communication.h"
#include <vector>
//
// --- Sample implementation for the task communication ---
//
// To compile this program with the sample grader, place:
//     communication.h communication_sample.cpp sample_grader.cpp
// in a single folder, then open the terminal in this directory (right-click onto an empty spot in the directory,
// left click on "Open in terminal") and enter e.g.:
//     g++ -std=c++17 communication_sample.cpp sample_grader.cpp
// in this folder. This will create a file a.out in the current directory which you can execute from the terminal
// as ./a.out
// See task statement or sample_grader.cpp for the input specification
//

void encode(int N, int X) {
    assert(N == 3 && (X == 1 || X == 2 || X == 3));
    if (X == 1) {
        send(0);
        send(0);
        send(0);
        send(0);
    }
    else if (X == 2) {
        send(1);
        send(1);
        send(1);
        send(1);
    }
    else {
        send(1);
        send(0);
        send(0);
        send(1);
    }
}

std::pair<int, int> decode(int N) {
    std::vector<int> over;
    for (int i = 0; i < (1<<4); i++) if (__builtin_popcount(i) <= 2) over.push_back(i);
    std::vector<int> who [1<<4];
    for (int i : over) who[i].push_back(1);
    for (int i : over) who[i^(1+8)].push_back(2);
    for (int i : over) who[i^(1+2+4+8)].push_back(3);
    for (int i = 0; i < (1<<4); i++) {
        while (size(who[i]) < 2) {
            who[i].push_back(1);
        }
        assert(size(who[i]) <= 2);
    }
    int comp = 0;
    for (int i = 0; i < 4; i++) {
        int u = receive();
        if (u) {
            comp |= 1<<i;
        }
    }
    return {who[comp][0], who[comp][1]};
}

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