#include <iostream>
#include <vector>
using namespace std;
vector<vector<bool>> sent_packets;
vector<int> safe_positions;
extern vector<bool> send_packet(vector<bool> A);
void send_message(vector<bool> M, vector<bool> C) {
sent_packets.clear();
safe_positions.clear();
for (int i = 0; i < 31; ++i) {
vector<bool> packet(31, 0);
packet[i] = 1;
vector<bool> tainted = send_packet(packet);
sent_packets.push_back(tainted);
if (tainted[i] == 1) {
safe_positions.push_back(i);
}
}
int idx = 0;
while (idx < M.size()) {
vector<bool> packet(31, 0);
for (int j = 0; j < 16 && idx < M.size(); ++j, ++idx) {
packet[safe_positions[j]] = M[idx];
}
sent_packets.push_back(send_packet(packet));
}
}
vector<bool> receive_message(vector<vector<bool>> R) {
vector<int> safe_positions;
vector<bool> result;
for (int i = 0; i < 31; ++i) {
if (R[i][i] == 1) {
safe_positions.push_back(i);
}
}
for (int i = 31; i < R.size(); ++i) {
for (int pos : safe_positions) {
result.push_back(R[i][pos]);
}
}
return result;
}
