题解 | #单词倒排#

import javax.xml.crypto.dsig.keyinfo.RetrievalMethod;
import java.util.*;
import java.util.function.Consumer;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String s = sc.nextLine();

        StringBuilder sb = new StringBuilder(s);
        for (int i = 0; i < sb.length(); i++) {
            char c = sb.charAt(i);
            // 是字母,跳过
            if (c >= 65 && c <= 90) continue;
            if (c >= 97 && c <= 122) continue;
            // 不是字母
            sb.replace(i, i + 1, " ");
        }
        ArrayList<String> list = new ArrayList<>();
        StringBuilder temp = new StringBuilder();
        for (int i = 0; i < sb.length(); i++) {
            char c = sb.charAt(i);
            if (c != ' ') {
                temp.append(c);
                if (i == sb.length() - 1) list.add(temp.toString());
            } else {
                if (!temp.toString().isEmpty()) list.add(temp.toString());
                temp = new StringBuilder();
            }
        }
        for (int i = list.size() - 1; i >= 0; i--) {
            System.out.print(list.get(i) + " ");
        }
    }
}