料理需要多少种不同的材料
下厨房
http://www.nowcoder.com/questionTerminal/ca5c9ba9ebac4fd5ae9ba46114b0f476
用集合做:
import java.util.*; public class Main { public static void main(String[] args) throws Exception{ Scanner sc = new Scanner(System.in); Set<String> s = new HashSet<>(); while(sc.hasNext()) s.add(sc.next()); System.out.println(s.size()); } }