#include"communication.h"
//
// --- 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) {
if (X == 1) {
send(0);
send(0);
send(0);
send(0);
} else if (X == 2) {
send(0);
send(1);
send(1);
send(0);
} else {
send(1);
send(1);
send(1);
send(1);
}
}
std::pair<int, int> decode(int N) {
int mask = 0;
mask |= receive() << 0;
mask |= receive() << 1;
mask |= receive() << 2;
mask |= receive() << 3;
if (__builtin_popcount(mask) < 2) return {1, 2};
if (__builtin_popcount(mask) > 2) return {2, 3};
for (int i = 0; i < 3; i++) {
int cnt = 0;
if (mask & (1 << i)) cnt++;
if (mask & (1 << (i + 1))) cnt++;
if (cnt == 0) return {1, 2};
if (cnt == 2) return {2, 3};
}
return {1, 3};
}
