Submission #1278670

#	Time	Username	Problem	Language	Result	Execution time	Memory
1278670		IBory	Combo (IOI18_combo)	C++20	Compilation error	0 ms	0 KiB

combo

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

string guess_sequence(int N) {
	string P = "ABXY";
	int n = press("AB");
	char c = ' ';
	if (n) c = (press("A") ? 'A' : 'B');
	else c = (press("X") ? 'X' : 'Y');
	P.erase(P.begin() + P.find(c));

	string S; S.push_back(c);
	string P1, P21, P22, P23;
	P1.push_back(P[0]);
	P21.push_back(P[1]); P21.push_back(P[0]);
	P22.push_back(P[1]); P22.push_back(P[1]);
	P23.push_back(P[1]); P23.push_back(P[2]);
	
	for (int i = 2; i < N; ++i) {
		string T = S + P1 + S + P21 + S + P22 + S + P23;
		int n = press(T);
		if (n == (i - 1)) S.push_back(P[2]);
		else if (n == i) S.push_back(P[0]);
		else S.push_back(P[1]);
	}

	for (int i = 0; i < 3; ++i) {
		S.push_back(P[i]);
		if (i == 2 || guess(S) == N) return S;
		S.pop_back();
	}

	return "";
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:30:31: error: 'guess' was not declared in this scope
   30 |                 if (i == 2 || guess(S) == N) return S;
      |                               ^~~~~