查找和替换模式

/*
 * 思路：
 * 1. 使用流处理来遍历和过滤单词。
 * 2. 使用辅助函数检查单词是否匹配模式。
 */
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;
import java.util.HashMap;

public class Solution {
    public List<String> findAndReplacePattern(String[] words, String pattern) {
        return Arrays.stream(words)
                     .filter(word -> matches(word, pattern))
                     .collect(Collectors.toList());
    }

    private boolean matches(String word, String pattern) {
        if (word.length() != pattern.length()) {
            return false;
        }
        Map<Character, Character> mapWordToPattern = new HashMap<>();
        Map<Character, Character> mapPatternToWord = new HashMap<>();
        for (int i = 0; i < word.length(); i++) {
            char w = word.charAt(i);
            char p = pattern.charAt(i);
            if (!mapWordToPattern.containsKey(w)) {
                mapWordToPattern.put(w, p);
            }
            if (!mapPatternToWord.containsKey(p)) {
                mapPatternToWord.put(p, w);
            }
            if (mapWordToPattern.get(w) != p || mapPatternToWord.get(p) != w) {
                return false;
            }
        }
        return true;
    }
}