Submission #125087

#	Time	Username	Problem	Language	Result	Execution time	Memory
125087		arthurconmy	Combo (IOI18_combo)	C++14	5 / 100	56 ms	460 KiB

combo

#include <iostream>
#include <fstream>
#include <vector>
#include <string>
#include <cmath>
#include <algorithm>
#include <map>
#include <queue>
#include <bitset>
#include <random>
#include <stack>
#include <deque>
#include <chrono>
#include "combo.h"
using namespace std;
typedef long long ll;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<ll> vll;
typedef vector<bool> vb;
typedef pair<int,int> pii;
#define REP(i, a, b) for (int i = int(a); i <= int(b); i++)
#define REPb(j, d, c) for (int j = int(d); j >= int(c); j--)
#define ff first
#define ss second
#define pb push_back
#define len(x) int((x).size())

string guess_sequence(int N)
{
	int n=N;
	string ans;

	int ret1 = press("AB");
	if(ret1>0)
	{
		int ret2=press("A");
		if(ret2>0) ans+='A';
		else ans+='B';
	}
	else
	{
		int ret2=press("X");
		if(ret2>0) ans+='X';
		else ans+='Y';
	}

	if(N==1) return ans;

	vector<char> ALL = {'A','B','X','Y'};
	vector<char> V;

	REP(i,0,3)
	{
		if(ALL[i] != ans[0]) V.pb(ALL[i]);
	}

	REP(i,2,n-1)
	{
		string cur_press = ans+V[0]+ans+V[1]+V[0]+ans+V[1]+V[1]+ans+V[1]+V[2];
		int ret3=press(cur_press);

		if(ret3==i-1) ans+=V[2];
		if(ret3==i) ans+=V[0];
		if(ret3==i+1) ans+=V[1];
	}

	int ret4=press(ans+V[0]);
	if(ret4==N) return ans+V[0];

	int ret5=press(ans+V[1]);
	if(ret5==N) return ans+V[1];

	return ans+V[2];
}

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