Submission #115393

#	Time	Username	Problem	Language	Result	Execution time	Memory
115393		kitoha	Combo (IOI18_combo)	C++14	97 / 100	62 ms	576 KiB

combo

#include "combo.h"
#include<bits/stdc++.h>

using namespace std;

char key[] = { 'A','B','X','Y' };
string s;

string guess_sequence(int N) {
	char element[3];
	int pos = 0;
	int idx = 0;
	if (press("AB")) {
		if (press("A")) {
			s = "A";
			idx = 0;
		}
		else {
			s = "B";
			idx = 1;
		}
	}
	else {
		if (press("XY")) {
			if (press("X")) {
				s = "X"; 
				idx = 2;
			}
			else {
				s = "Y";
				idx = 3;
			}
		}
	}

	if (N == 1) return s;
	for (int i = 0; i <= 3; i++) {
		if (idx == i) continue;
		element[pos++] = key[i];
	}

	for(int i=1;i<=N-2;i++){
		int cnt = press(s + element[0] + element[0] + s + element[0] + element[1] + s + element[0] + element[2] + s + element[1]);
		int cur = s.size();
		if (cnt == cur + 2) s = s + element[0];
		else if (cnt == cur + 1) s = s + element[1];
		else s = s + element[2];
	}

	if (press(s + element[0]) ==N ) s = s + element[0];
	else if (press(s + element[1]) == N) s = s + element[1];
	else s = s + element[2];

	return s;
}

• Subtask 1: 5 / 5
• Subtask 2: 92 / 95