题解 | #提取不重复的整数#
提取不重复的整数
https://www.nowcoder.com/practice/253986e66d114d378ae8de2e6c4577c1
import java.util.Scanner;
import java.util.Set;
import java.util.HashSet;
// 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);
Set<String> set = new HashSet<String>();
String num = in.next();
String[] nums = num.split("");
for(String s : nums){
set.add(s);
}
String temp = "";
for(int i = nums.length-1; i>=0; i--){
if(set.contains(nums[i])){
set.remove(nums[i]);
temp = temp + nums[i];
}
}
System.out.println(temp);
}
}
