Submission #503944

#	Time	Username	Problem	Language	Result	Execution time	Memory
503944		TranGiaHuy1508	Combo (IOI18_combo)	C++17	Compilation error	0 ms	0 KiB

combo

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


#ifdef LOCAL
	int press(string p){
		cout << p << "\n";
		fflush(stdout);
		int r; cin >> r; return r;
	}
#endif

string ch = "ABXY";

string guess_sequence(int n){
	string prefix = "";
	string other;
	if (press("AABB")){
		if (press("AA")){
			prefix = "A";
			other = "BXY";
		}
		else{
			prefix = "B";
			other = "AXY";
		}
	}
	else{
		if (press("XX")){
			prefix = "X";
			other = "ABY";
		}
		else{
			prefix = "Y";
			other = "ABX";
		}
	}

	for (int i=2; i<=n; i++){
		string c = prefix + other[0] + prefix + other[1];
		if (press(c) > (int)prefix.length()){
			string d = prefix + other[0];
			if (press(d) > (int)prefix.length()){
				prefix += other[0];
			}
			else{
				prefix += other[1];
			}
		}
		else{
			prefix += other[2];
		}
	}

	return prefix;
}

#ifdef LOCAL
	int main(){
		int n; cin >> n;
		cout << guess_sequence(n);
	}
#endif

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:18:6: error: 'press' was not declared in this scope
   18 |  if (press("AABB")){
      |      ^~~~~
combo.cpp:41:7: error: 'press' was not declared in this scope
   41 |   if (press(c) > (int)prefix.length()){
      |       ^~~~~