Submission #1185542

#	Time	Username	Problem	Language	Result	Execution time	Memory
1185542		orgiloogii	Combo (IOI18_combo)	C++20	Compilation error	0 ms	0 KiB

combo

#include <bits/stdc++.h>
using namespace std;
int press(string p);

string guess_sequence(int N) {
	string p = "";
	string ans = "";
	for (int i = 0; i < N; ++i) {
		p += 'A';
	}
	int coins = press(p);
	char v0;
	if (coins) {
		ans += 'A';
		v0 = 'A';
	}
	else {
		for (int i = 0; i < N; ++i) {
			p += 'B';
		}
		coins = press(p);
		if (coins) {
			ans += 'B';
			v0 = 'B';
		}
		else {
			for (int i = 0; i < N; ++i) {
				p += 'X';
			}
			coins = press(p);
			if (coins) {
				ans += 'X';
				v0 = 'X';
			}
			else {
				ans += 'Y';
				v0 = 'Y';
			}
		}
	}
	while (ans.size() < N - 1) {
		p.clear();
		if (v0 == 'A') p = ans + "B" + "X" + ans + "B" + "Y" + ans + "B" + "B" + ans + "X";
		if (v0 == 'B') p = ans + "A" + "X" + ans + "A" + "Y" + ans + "A" + "A" + ans + "X";
		if (v0 == 'X') p = ans + "A" + "Y" + ans + "A" + "B" + ans + "A" + "A" + ans + "Y";
		if (v0 == 'Y') p = ans + "A" + "X" + ans + "A" + "B" + ans + "A" + "A" + ans + "X";
		int coins = press(p);
		if (coins == 3) {
			if (v0 == 'A') ans += 'B';
			if (v0 == 'B') ans += 'A';
			if (v0 == 'X') ans += 'A';
			if (v0 == 'Y') ans += 'A';
		}
		else if (coins == 2) {
			if (v0 == 'A') ans += 'X';
			if (v0 == 'B') ans += 'X';
			if (v0 == 'X') ans += 'Y';
			if (v0 == 'Y') ans += 'X';
		}
		else {
			if (v0 == 'A') ans += 'Y';
			if (v0 == 'B') ans += 'Y';
			if (v0 == 'X') ans += 'B';
			if (v0 == 'Y') ans += 'Y';
		}
	}
	if (v0 == 'A') {
		if (press(ans + 'B') == n) {
			return ans + 'B';
		}
		else if (press(ans + 'X') == n) {
			return ans + 'X';
		}
		return ans + 'Y';
	}
	if (v0 == 'B') {
		if (press(ans + 'A') == n) {
			return ans + 'A';
		}
		else if (press(ans + 'X') == n) {
			return ans + 'X';
		}
		return ans + 'Y';
	}
	if (v0 == 'X') {
		if (press(ans + 'B') == n) {
			return ans + 'B';
		}
		else if (press(ans + 'A') == n) {
			return ans + 'A';
		}
		return ans + 'Y';
	}
	if (v0 == 'Y') {
		if (press(ans + 'B') == n) {
			return ans + 'B';
		}
		else if (press(ans + 'X') == n) {
			return ans + 'X';
		}
		return ans + 'A';
	}
	return ans;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:68:41: error: 'n' was not declared in this scope
   68 |                 if (press(ans + 'B') == n) {
      |                                         ^
combo.cpp:77:41: error: 'n' was not declared in this scope
   77 |                 if (press(ans + 'A') == n) {
      |                                         ^
combo.cpp:86:41: error: 'n' was not declared in this scope
   86 |                 if (press(ans + 'B') == n) {
      |                                         ^
combo.cpp:95:41: error: 'n' was not declared in this scope
   95 |                 if (press(ans + 'B') == n) {
      |                                         ^