解题思路:
注意事项:
参考代码:
import java.util.HashSet;
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
String str= scanner.nextLine();
String[] strings=str.split(" ");
HashSet<Object> set = new HashSet<>();
int count=0;
for (int i = 0; i < strings.length; i++) {
if (set.add(strings[i])){
count++;
}
}
System.out.println(count);
}
}
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