Submission #421432

#	Time	Username	Problem	Language	Result	Execution time	Memory
421432		alireza_kaviani	Combo (IOI18_combo)	C++11	100 / 100	56 ms	496 KiB

combo

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

vector<string> vec = {"A" , "B" , "X" , "Y"} , valid;

string guess_sequence(int n){
	string cur = ""; int res = 0;
	if(press(vec[1] + vec[3]))	res |= 1;
	if(press(vec[2] + vec[3]))	res |= 2;
	cur = vec[res];
	if(n == 1)	return cur;
	for(string i : vec){
		if(i != cur){
			valid.push_back(i);
		}
	}
	for(int i = 1 ; i + 1 < n ; i++){
		string ask = cur + valid[1];
		for(string j : valid)	ask += cur + valid[2] + j;
		int res = press(ask);
		for(int j = 0 ; j < 3 ; j++){
			if(res == i + j)	cur += valid[j];
		}
	}
	for(int i = 0 ; i < 2 ; i++){
		if(press(cur + valid[i]) == n)	return cur + valid[i];
	}
	return cur + valid[2];
}

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