PAT (Basic Level) 1076 Wifi密码 (15分)JAVA解法

输入样例：

8
A-T B-F C-F D-F
C-T B-F A-F D-F
A-F D-F C-F B-T
B-T A-F C-F D-F
B-F D-T A-F C-F
A-T C-F B-F D-F
D-T B-F C-F A-F
C-T A-F B-F D-F

输出样例：

13224143

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {

	public static void main(String[] args) throws NumberFormatException, IOException {
		
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		int n = Integer.parseInt(br.readLine());
		StringBuilder sb = new StringBuilder();
		while(n!=0) {
			String[] arr = br.readLine().split(" ");
			for (int i = 0; i < arr.length; i++) {
				if(arr[i].endsWith("T")) {//A-1 B-2 C-3 D-4
					switch (arr[i].substring(0, 1)) {
					case "A":
						sb.append("1");
						break;
					case "B":
						sb.append("2");				
						break;
					case "C":
						sb.append("3");
						break;
					case "D":
						sb.append("4");
						break;
					}
				}
			}
			n--;
		}
		System.out.println(sb.toString());
	}

}