Submission #139655

#	Time	Username	Problem	Language	Result	Execution time	Memory
139655		bazsi700	Combo (IOI18_combo)	C++14	5 / 100	2 ms	296 KiB

combo

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

#define MOD 1000000007
#define ll long long int
#define vi vector<int>
#define vii vector< vector<int> >
#define PI 3.1415926535897932384626433832795
#define INF 9223372036854775807LL
#define hashA 1257958787
#define hashB 1539500609
#define endl "\n"

string guess_sequence(int n) {
	string st;
	vector<string> chs;
	if(press("AB")) {
		if(press("A")) {
			st = "A";
			chs = {"B","X","Y"};
		} else {
			st = "B";
			chs = {"A","X","Y"};
		}
	} else {
		if(press("X")) {
			st = "X";
			chs = {"A","B","Y"};
		} else {
			st = "Y";
			chs = {"A","B","X"};
		}
	}
	string currs = st;
	for(int i = 2; i < n; i++) {
		string ask = currs;
		ask+= chs[0];
		ask+= currs;
		ask+= chs[1];
		ask+= chs[0];
		ask+= currs;
		ask+= chs[1];
		ask+= chs[1];
		ask+= currs;
		ask+= chs[1];
		ask+= chs[2];
		int x = press(ask);
		if(x == i-1) {
			currs+= chs[2];
		} else if(x == i) {
			currs+= chs[0];
		} else {
			currs+= chs[1];
		}
	}
	string ask = currs;
	ask+= chs[0];
	if(press(ask) == n) {
		currs+= chs[0];
	} else {
		string askk = currs;
		askk+= chs[1];
		if(press(askk) == n) {
			currs+= chs[1];
		} else {
			currs+= chs[2];
		}
	}
	return currs;
}

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