This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include"communication.h"
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
void encode(int N, int X) {
send(X & 2);
send(X & 2);
send(X & 1);
send(X & 1);
}
pair<int, int> decode(int N) {
int b1 = receive();
int b2 = receive();
int a1 = receive();
int a2 = receive();
// b2 or a1 must be real
if (a1 == a2) return { a1, a1 + 2 };
if (b1 == b2) return { b1, b1 + 1 };
return { a1 + 2 * b1, a2 + 2 * b2 };
}
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