BOJ 1343 폴리오미노

1343.cpp

#include<iostream>
#include<vector>
#include<string>
#include<cstring>
#include<algorithm>
using namespace std;

int main()
{
	ios::sync_with_stdio(false);
	
	string s, ans;

	cin >> s;
	int len = s.length(), p = 0;
	while (p < len)
	{
		if (s[p] == '.') p++, ans += ".";
		else
		{
			int k = 0;
			while (s[p] == 'X' && p < len)k++,p++;
			if (k % 2 == 1)
			{
				cout << "-1\n";
				return 0;
			}
			while (k)
			{
				if (k >= 4) k -= 4, ans += "AAAA";
				else k -= 2, ans += "BB";
			}
		}
	}
	cout << ans;
}