Submission #139080

#	Time	Username	Problem	Language	Result	Execution time	Memory
139080		rajarshi_basu	Combo (IOI18_combo)	C++14	100 / 100	216 ms	2380 KiB

combo

#include <bits/stdc++.h>

#include "combo.h"

#define FOR(i,n) for(int i=0;i<n;i++)
#define FORE(i,a,b) for(int i = a;i<=b;i++)
#define ll long long int
#define pb push_back
#define vi vector<int>
#define ff first
#define ss second
#define vv vector
#define ii pair<int,int>

using namespace std;
string s = "ABXY";
string res = "";

int pre1ss(string ss){
	cout << ss << endl;
	int x;cin >> x;
	return x;
}

void firstGuess(){
	int x = press("AB");
	if(x == 2){
		res = "A";
	}else if(x == 1){
		x = press("A");
		if(x == 0)res = "B";
		else res = "A";
	}else{
		x = press("X");
		if(x == 0)res = "Y";
		else res = "X";
	}
}

void reformS(){
	string ss = "";
	for(auto e: s){
		if(!(e == res[0]))ss += e;
	}
	s = ss;
}


string guess_sequence(int n){
	// first we guess the first character
	firstGuess();
	reformS();
	int len = 1;
	while(1){
		if(len == n)break;
		if(len == n-1){
			int v = press(res + s[0]);
			if(v == n){
				res += s[0];
			}else{
				v = press(res + s[1]);
				if(v == n){
					res += s[1];
				}else{
					res += s[2];
				}
			}
			break;
		}else{
			string x;
			x  = res;x += s[0];x += s[0];x += res[0];
			x += res;x += s[0];x += s[1];x += res[0];
			x += res;x += s[1];x += s[1];
			int ans = press(x);
			if(ans == len){
				res += s[2];
				len++;
			}else if(ans == len + 1){
				x = res;x += s[1];x += s[2];
				ans = press(x);
				if(ans == len){
					res += s[0];res += s[2];
				}else if(ans == len+1){
					res += s[1];res += s[0];
				}else{
					res += s[1];res += s[2];
				} 
				len += 2;
			}else if(ans == len + 2){
				x = res;x += s[0];x += s[0];
				ans = press(x);
				if(ans == len){
					res += s[1];res += s[1];
				}else if(ans == len +1){
					res += s[0];res += s[1];
				}else{
					res += s[0];res += s[0];
				}
				len += 2;
			}
		}
	}
	return res;
}

int ma1in(){
	string x = guess_sequence(3);
	cout << x << endl;
	return 0;
}

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