Submission #115554

#	Time	Username	Problem	Language	Result	Execution time	Memory
115554		suzy	Combo (IOI18_combo)	C++17	10 / 100	63 ms	296 KiB

combo

#include <iostream>
#include <string>
#include "combo.h"

using namespace std;

string guess_sequence(int n) {
	string s;
	char c[3]; int k=0;
	if(press("A")) s="A";
	else if(press("B")) s="B";
	else if(press("X")) s="X";
	else s="Y";
	if(s[0]!='A') c[k++]='A';
	if(s[0]!='B') c[k++]='B';
	if(s[0]!='X') c[k++]='X';
	if(s[0]!='Y') c[k++]='Y';
	for(int i=0;i<n-1;i++)
		s+=c[0];
	int pre=press(s);
	for(int i=pre;i<n;i++) {
		s[i]=c[1];
		int w=press(s);
		if(w>pre) {
			pre=w;
			i=w-1;
		} else {
			s[i]=c[2];
			pre=press(s);
			i=pre-1;
		}
	}
	return s;
}

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