Submission #87920

#	Time	Username	Problem	Language	Result	Execution time	Memory
87920		jhnah917	Combo (IOI18_combo)	C++14	5 / 100	2 ms	256 KiB

combo

#include "combo.h"
#include <vector>
using namespace std;

string guess_sequence(int N) {
	/*std::string p = "";
	for (int i = 0; i < 4 * N; ++i) {
		p += 'A';
	}
	int coins = press(p);
	std::string S = "";
	for (int i = 0; i < N; ++i) {
		S += 'A';
	}
	return S;*/
	
	string s = "";
	//i = 1
	if(press("AB") > 0){
		if(press("A") > 0) s = "A";
		else s = "B";
	}else if(press("X") > 0){
		s = "X";
	}else s = "Y";
	
	vector<string> arr(3);
	if(s == "A"){
		arr[0] = "B";
		arr[1] = "X";
		arr[2] = "Y";
	}
	else if(s == "B"){
		arr[0] = "A";
		arr[1] = "X";
		arr[2] = "Y";
	}
	else if(s == "X"){
		arr[0] = "A";
		arr[1] = "B";
		arr[2] = "Y";
	}
	else if(s == "Y"){
		arr[0] = "A";
		arr[1] = "B";
		arr[2] = "X";
	}
	
	//2~N-1
	for(int i=2; i<=N-1; i++){
		int value = press(s + arr[0] + arr[0] + s + arr[0] + arr[1] + s + arr[0] + arr[2] + s + arr[1]);
		if(value == i-1) s += arr[2];
		else if(value == i) s += arr[1];
		else s += arr[0];
	}
	
	//N
	if(press(s + arr[0]) == N) s += arr[0];
	else if(press(s + arr[1]) == N) s += arr[1];
	else s += arr[2];
	return s;
}

• Subtask 1: 5 / 5
• Subtask 2: 0 / 95