HJ17 坐标移动

1. 题目

读题

HJ17 坐标移动 

 

考查点

 

2. 解法

思路

 

代码逻辑

 

具体实现

 

public class HJ017 {

    public static List<String> directs = Arrays.asList("A", "D", "W", "S");
    
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.println(move(sc.nextLine()));
    }

    public static String move(String actions) {
        int x = 0, y = 0;
        for (String action : actions.split(";")) {
            String[] cur = validAndSplit(action);
            if (cur == null) {
                continue;
            }
            String direct = cur[0];
            int step = Integer.valueOf(cur[1]);

            if ("A".equals(direct)) {
                x = x - step;
            } else if ("D".equals(direct)) {
                x = x + step;
            } else if ("W".equals(direct)) {
                y = y +step;
            } else if ("S".equals(direct)) {
                y = y -step;
            }
        }
        return x + "," + y;

    }


    public static String[] validAndSplit(String action) {
        if (action == null || action.isEmpty()) {
            return null;
        }

        String c = action.charAt(0) + "";
        if (!directs.contains(c)) {
            return null;
        }

        for (int i = 1; i < action.length(); i++) {
            if (!Character.isDigit(action.charAt(i))) {
                return null;
            }
        }

        return new String[]{c + "", action.substring(1)};
    }

}

3. 总结