题解 | #坐标移动#

import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        while (sc.hasNext()) {
            String line = sc.nextLine();
            String[] arr = line.split(";");
            int x = 0;
            int y = 0;
            for (String s : arr) {
                // 过滤非法字符结果
                int length = s.length();
                if (length < 2) {
                    continue;
                }
                String reduceRemove = s.replaceAll("[ADWS]", "");
                if (length - reduceRemove.length() > 1) {
                    continue;
                }
                String invalidStr = s.replaceAll("[ADWS0-9]", "");
                if (invalidStr.length() > 0) {
                    continue;
                }
                switch (s.charAt(0)) {
                    case 'A':
                        x -= Integer.parseInt(s.substring(1));
                        break;
                    case 'D':
                        x += Integer.parseInt(s.substring(1));
                        break;
                    case 'W':
                        y += Integer.parseInt(s.substring(1));
                        break;
                    case 'S':
                        y -= Integer.parseInt(s.substring(1));
                        break;
                }
            }
            System.out.println(x + "," + y);
        }
        sc.close();
    }

}

更简洁的写法：

import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        while (sc.hasNext()) {
            String line = sc.nextLine();
            String[] arr = line.split(";");
            int x = 0;
            int y = 0;
            for (String s : arr) {
                // 过滤非法字符结果
                if (!s.matches("[ADWS][0-9]{1,5}")) {
                    continue;
                }
                int digit = Integer.parseInt(s.substring(1));
                switch (s.charAt(0)) {
                    case 'A':
                        x -= digit;
                        break;
                    case 'D':
                        x += digit;
                        break;
                    case 'W':
                        y += digit;
                        break;
                    case 'S':
                        y -= digit;
                        break;
                }
            }
            System.out.println(x + "," + y);
        }
        sc.close();
    }
}