#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++) {
for (int j=0; j<3; j++) {
// cerr << i << " " << j << " " << (codes[i][j] != received[j] and codes[i][j+1] != received[j+1]) << "\n";
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()]};
}
