题解 | 小红书推荐系统

import java.util.*;
import java.util.stream.Collectors;
public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String input = scanner.nextLine();
        Map<String, Integer> wordCount = new HashMap<>();
        String[] words = input.split("\\s+");
        for (String word : words) {
            if (!word.isEmpty()) {
                wordCount.put(word, wordCount.getOrDefault(word, 0) + 1);
            }
        }
        List<Map.Entry<String, Integer>> keywords = wordCount.entrySet().stream()
            .filter(entry -> entry.getValue() >= 3)
            .sorted((a, b) -> {
                if (!a.getValue().equals(b.getValue())) {
                    return b.getValue() - a.getValue();
                }
                return a.getKey().compareTo(b.getKey());
            })
            .collect(Collectors.toList());
        for (Map.Entry<String, Integer> entry : keywords) {
            System.out.println(entry.getKey());
        }
    }
}