Submission #571136

#	Time	Username	Problem	Language	Result	Execution time	Memory
571136		sentheta	콤보 (IOI18_combo)	C++17	5 / 100	2 ms	256 KiB

combo

#include "combo.h"
#include<bits/stdc++.h>
using namespace std;

#define V vector
#define rep(i,a,b) for(int i=(a); i<(b); i++)


int n;
string s;
#define sz (int)s.size()

V<char> arr = {'A','B','X','Y'};
int f(char c){
	int i = 0;
	while(arr[i] != c) i++;
	return i;
}


string guess_sequence(int _n){
	n = _n;

	// find first char
	{
		int ax = press("AX"), bx = press("BX");

		if(ax && bx) s = "X";
		else if(ax) s = "A";
		else if(bx) s = "B";
		else s = "Y";
	}
	// put s[0] as last char
	swap(arr[f(s[0])], arr.back());

	//cout << s << endl;

	while(sz < n-1){
		string t = "";
		t += s; t += arr[0]; t += arr[0];
		t += s; t += arr[0]; t += arr[1];
		t += s; t += arr[0]; t += arr[2];
		t += s; t += arr[1];

		//cout << t << endl;
		int len = press(t);

		if(len==sz) s += arr[2];
		else if(len==sz+1) s += arr[1];
		else s += arr[0];
	}

	//assert(sz == n-1);
	//cout << s << endl;

	// last char
	string t;
	t += s; t += arr[0];
	t += s; t += arr[1];
	if(press(t) > sz){
		t = "";
		t += s; t += arr[0];
		
		if(press(t) > sz) s += arr[0];
		else s += arr[1];
	}
	else s += arr[2];

	//cout << s << endl;
	return s;
}

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