Submission #668185

#	Time	Username	Problem	Language	Result	Execution time	Memory
668185		Sohsoh84	Flight to the Ford (BOI22_communication)	C++17	15 / 100	43 ms	1808 KiB

communication

#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};
}

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