Submission #127864

#	Time	Username	Problem	Language	Result	Execution time	Memory
127864		super_j6	Combo (IOI18_combo)	C++14	Compilation error	0 ms	0 KiB

combo

#include <iostream>
#include <cstdio>
#include <algorithm>
#include <string.h>
using namespace std;
#define endl '\n'

string guess_sequence(int n){
	string s = "";
	char c[4] = {'A', 'B', 'X', 'Y'};
	int bad = 4;
	
	auto r = [&](int x){
		return c[x + (x >= bad)];
	};
	
	for(int i = 0; i < n; i++){
		if(i == 0 || i == n - 1){
			if(press(s + r(0) + s + r(1)) > 0){
				if(press(s + r(0))){
					s += r(0);
					bad = 0;
				}else{
					s += r(1);
					bad = 1;
				}
			}else{
				if(press(s + r(2))){
					s += r(2);
					bad = 2;
				}else{
					s += r(3);
					bad = 3;
				}
			}
		}else{
			int x = press(s + r(1) + s + r(2) + r(0) + s + r(2) + r(1) + s + r(2) + r(2));
	
			if(x == 0){
				s += r(0);
			}else if(x == 1){
				s += r(1);
			}else{
				s += r(2);
			}
		}
	}
	
	return s;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:19:7: error: 'press' was not declared in this scope
   19 |    if(press(s + r(0) + s + r(1)) > 0){
      |       ^~~~~
combo.cpp:37:12: error: 'press' was not declared in this scope
   37 |    int x = press(s + r(1) + s + r(2) + r(0) + s + r(2) + r(1) + s + r(2) + r(2));
      |            ^~~~~