题解 | 坐标移动

import java.util.HashSet;
import java.util.Scanner;

// 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);
        // 注意 hasNext 和 hasNextLine 的区别
        int x = 0;
        int y = 0;
        HashSet<Character> set = new HashSet<>();
        set.add('A');
        set.add('D');
        set.add('W');
        set.add('S');
        while (in.hasNextLine()) { // 注意 while 处理多个 case
            // int a = in.nextInt();
            // int b = in.nextInt();
            // System.out.println(a + b);
            String s = in.nextLine();
            String[] ss = s.split(";");
            for (int i=0;i<ss.length;i++) {
                String word = ss[i].trim();
                if ("".equals(word)) {
                    continue;
                }
                char c = word.charAt(0);
                if (!set.contains(c)) {
                    continue;
                }
                if (!word.substring(1).chars().allMatch(Character::isDigit)) {
                    continue;
                }
                int steps = Integer.parseInt(word.substring(1));
                if (steps < 1 || steps > 99) {
                    continue;
                }
                if (c == 'A') {
                    x -= steps;
                } else if (c == 'D') {
                    x += steps;
                } else if (c == 'W') {
                    y += steps;
                } else {
                    y -= steps;
                }
            }

            System.out.println(x + "," + y);
        }
    }
}