Submission #1008490

#	Time	Username	Problem	Language	Result	Execution time	Memory
1008490		nickolasarapidis	Combo (IOI18_combo)	C++17	0 / 100	0 ms	344 KiB

combo

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

string guess_sequence(int N){
	string S = "";
	int first = 5, last = 4;
	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(S + buttons[i]) > 0){
			first = i;
			break;
		}
	}

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

	// Q = 3 at worst

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

	for(int i = 1; i < N; i++){
		a = false;
		for(int i = 0; i < 2; i++){
			if(press(S + b[i]) == i + 1){
				S += b[i];
				a = true;
				break;
			}
		}

		if(a == false){
			S += b[2];
		}
	}

	// Q = 2*N + 3 at worst

	return S;
}

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 = 4;
      |                 ^~~~

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