HashSet
提取不重复的整数
http://www.nowcoder.com/questionTerminal/253986e66d114d378ae8de2e6c4577c1
import java.util.*;
public class Main {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
String s = sc.nextLine();
Set<Character> set = new HashSet<>();
for(int i = s.length() - 1; i >= 0; i--) {
if(set.add(s.charAt(i))) {
System.out.print(s.charAt(i));
}
}
}
}
投递谷歌等公司7个岗位 >