Submission #388352

#	Time	Username	Problem	Language	Result	Execution time	Memory
388352		warner1129	Combo (IOI18_combo)	C++17	0 / 100	1 ms	200 KiB

combo

// #define local

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

#ifdef local
int press(string p) {
	cout << p;
	int ret;
	cin >> ret;
	return ret;
}
string guess_sequence(int);
signed main() {
	int n;
	cin >> n;
	cout << guess_sequence(n) << '\n';
	return 0;
}
#else
#include <combo.h>
#endif

string guess_sequence(int n) {
	string ans, tmp;
	int ret, len = 1;
	ret = press("AB");
	if (ret == 1) {
		ret = press("A");
		if (ret == 1) ans = "A";
		else ans = "B";
	}	
	else {
		ret = press("X");
		if (ret == 1) ans = "X";
		else ans = "Y";
	}
	vector<string> L;
	if ("A" != ans) L.push_back("A");
	if ("B" != ans) L.push_back("B");
	if ("X" != ans) L.push_back("X");
	if ("Y" != ans) L.push_back("Y");
	string P[4];
	P[0] = L[0] + L[0], P[1] = L[0] + L[1], P[2] = L[0] + L[2];
	P[3] = L[1];
	for (int i = 2; i < n; i++) {
		tmp = "";
		for (int j = 0; j < 4; j++)
			tmp += (ans + P[j]);
		ret = press(tmp);
		if (ret == len + 2) ans += L[0];
		else if (ret == len + 1) ans += L[1];
		else if (ret == len) ans += L[2];
		len++;
	}
	ret = press(ans + L[0] + ans + L[1]);
	if (ret == len+1) {
		ret = press(ans + L[0]);
		if (ret == len+1) ans += L[0];
		else ans += L[1];
	}
	else if (ret == len)
		ans += L[2];
	return ans;	
}

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