题解 | #单词倒排#
单词倒排
https://www.nowcoder.com/practice/81544a4989df4109b33c2d65037c5836
import java.util.*; // 注意类名必须为 Main, 不要有任何 package xxx 信息 public class Main { public static void main(String[] args) { Scanner in = new Scanner(System.in); while (in.hasNext()) { String str = in.nextLine(); char[] chars = str.toCharArray(); int slow = 0;//慢指针 StringBuilder sb = new StringBuilder(); for (char c : chars) { if (Character.isLetter(c)) { sb.append(c); slow++; } else if (slow > 0 && ' ' != sb.charAt(slow - 1)) { sb.append(" "); slow++; } } String[] ss = sb.toString().split(" "); for (int i = ss.length - 1; i >= 0; i--) { System.out.print(ss[i] + " "); } } } }