Submission #603909

#	Time	Username	Problem	Language	Result	Execution time	Memory
603909		kostka	Flight to the Ford (BOI22_communication)	C++17	0 / 100	4 ms	428 KiB

communication

#include "bits/stdc++.h"
#include "communication.h"

using namespace std;

const string codes[3] = {"0000", "0110", "1111"};

void encode(int N, int X) {
  assert(N <= 3);
  for (auto c : codes[X-1]) send(c-'0');
}

std::pair<int, int> decode(int N) {
  assert(N <= 3);
  string received;
  for (int i=0; i<4; i++) {
    received += to_string(receive());
  }
  set <int> S = {1, 2, 3};
  for (int i=0; i<3; i++) {
    bool ok = false;
    for (int j=0; j<2; j++) {
      if (codes[i][j] != received[j] and codes[i][j+1] != received[j+1]) S.erase(i+1);
    }
  }
  assert(S.size() <= 2);
  vector <int> VS(S.begin(), S.end());
  return {VS[0], VS[1%VS.size()]};
}

Compilation message (stderr)

communication.cpp: In function 'std::pair<int, int> decode(int)':
communication.cpp:21:10: warning: unused variable 'ok' [-Wunused-variable]
   21 |     bool ok = false;
      |          ^~

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