Submission #318413

#	Time	Username	Problem	Language	Result	Execution time	Memory
318413		soroush	Combo (IOI18_combo)	C++14	100 / 100	56 ms	564 KiB

combo

#include <bits/stdc++.h>
#include "combo.h"
 
using namespace std;
 
 
string guess_sequence(int n){
	string ans = "";
	vector < string > vec = {"A" , "B" , "X" , "Y"};
	mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
	shuffle(vec.begin() , vec.end() , rng);
	string f = vec[0];
	if(press(vec[0] + vec[1])){
		if(press(vec[1]))
			f = vec[1];
	}
	else{
		if(press(vec[2]))
			f = vec[2];
		else
			f = vec[3];
	}
	ans += f;
	vector < string > v;
	for(int i = 0 ; i < 4 ; i ++){
		auto s = vec.back();
		vec.pop_back();
		if(s!=f)
			v.push_back(s);
	}
	for(int i = 1 ; i < n-1 ; i ++){
		int res = press(ans + v[0] + ans + v[1] + v[0] + ans + v[1] + v[1] + ans + v[1] + v[2]);
		if(res == i)
			ans += v[2];
		if(res == i + 1)
			ans += v[0];
		if(res == i + 2)
			ans += v[1];
	}
	if(n == 1)return(ans);
	f = v[0];
	if(press(ans + v[1]) == n)	
		f = v[1];
	else if(press(ans + v[2]) == n)	
		f = v[2];
	ans += f;
	return(ans);
}

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