Submission #161141

#	Time	Username	Problem	Language	Result	Execution time	Memory
161141		InkretBear	Combo (IOI18_combo)	C++14	100 / 100	96 ms	564 KiB

combo

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

using namespace std;

std::string guess_sequence(int n) {
	int q=press("AB");
	int w=press("AX");
	char s[4]={'A','B','X','Y'};
	if (q && w){
		swap(s[0],s[3]);
	}
	if (q && !w){
		swap(s[1],s[3]);
	}
	if (!q && w){
		swap(s[2],s[3]);
	}
	string res,u;
	res.push_back(s[3]);
	if (n==1){
		return res;
	}
	for (int i=1;i<n-1;++i){
		u.clear();
		for (int j=0;j<i;++j){
			u.push_back(res[j]);
		}
		u.push_back(s[1]);
		for (int j=0;j<i;++j){
			u.push_back(res[j]);
		}
		u.push_back(s[0]);
		u.push_back(s[0]);
		for (int j=0;j<i;++j){
			u.push_back(res[j]);
		}
		u.push_back(s[0]);
		u.push_back(s[2]);
		for (int j=0;j<i;++j){
			u.push_back(res[j]);
		}
		u.push_back(s[0]);
		u.push_back(s[1]);
		q=press(u);
		if (q==i){
			res.push_back(s[2]);
		}
		if (q==i+1){
			res.push_back(s[1]);
		}
		if (q==i+2){
			res.push_back(s[0]);
		}
	}
	u.clear();
	for (int i=0;i<n-1;++i){
		u.push_back(res[i]);
	}
	u.push_back(s[0]);
	q=press(u);
	u.clear();
	for (int i=0;i<n-1;++i){
		u.push_back(res[i]);
	}
	u.push_back(s[1]);
	w=press(u);
	if (q==n){
		res.push_back(s[0]);
	}
	else if (w==n){
		res.push_back(s[1]);
	}
	else {
		res.push_back(s[2]);
	}
	return res;
}

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