Submission #1008582

#	Time	Username	Problem	Language	Result	Execution time	Memory
1008582		nickolasarapidis	Combo (IOI18_combo)	C++17	0 / 100	16 ms	716 KiB

combo

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

string guess_sequence(int N){
	string S1 = "", S2 = "";
	int first = 5, last = 1;
	//bool a;

	char buttons[4] = {'A', 'B', 'X', 'Y'};
	vector<char> b; // size of b = 3

	for(int i = 0; i < 3; i++){
		if(press(S1 + buttons[i]) == 1){
			first = i;
			S1 += buttons[i];
			S2 += buttons[i];
			break;
		}
	}

	if(first == 5){
		first = 3;
		S1 += buttons[3];
		S2 += buttons[3];
	}

	// Q = 3 at worst

	for(int i = 0; i < 4; i++){
		if(i != first){
			b.push_back(buttons[i]); // New button list
		}
	}

	int prefix;

	for(int i = 1; i < N; i++){
		prefix = press(S1 + b[0] + S2 + b[1]);

		if(prefix == i){
			S1 += b[2];
			S2 += b[2];
		}
		else{
			S1 += b[0];
			S2 += b[1];
		}
	}

	prefix = press(S1);

	if(prefix == N){
		return S1;
	}
	else{
		return S2;
	}
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:7:17: warning: unused variable 'last' [-Wunused-variable]
    7 |  int first = 5, last = 1;
      |                 ^~~~

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