题解 | #坐标移动#

package main

import (
    "fmt"
    "bufio"
    "os"
    "strings"
)

func isValidMove(s string) bool {
    size := len(s)

    // 长度判断
    if size < 2 || size > 4 {
        return false
    }

    // 第一个字符判断
    if s[0] != 'A' && s[0] != 'D' && s[0] != 'W' && s[0] != 'S' {
        return false
    }

    // 移动距离判断
    for i:=1; i<size; i++ {
        if i == 2 && s[i-1] == '0' {
            return false
        }
        if s[i] < '0' || s[i] > '9' {
            return false
        }
    }

    return true
}

func move2distace(s string) (byte, int) {
    var distance int
    
    for i:=1; i<len(s); i++ {
        distance = distance * 10 + int(s[i] - '0')
    }

    return s[0], distance
}

func calculatePosition(x int, y int, moves []string) (int, int) {
    endX, endY := x, y
    
    for _, move := range moves {
        if !isValidMove(move) {
            continue
        }

        directon, distance := move2distace(move)
        if directon == 'A' {
            endX -= distance
        } else if directon == 'D' {
            endX += distance
        } else if directon == 'W' {
            endY += distance
        } else {
            endY -= distance
        }
    }

    return endX, endY
}

func main() {
    var s string

    inputReader := bufio.NewReader(os.Stdin)
    data, _, _ := inputReader.ReadLine()
    s = string(data)

    endX, endY := calculatePosition(0, 0,  strings.Split(s, ";"))

    fmt.Printf("%d,%d\n", endX, endY)
}

// 本题输入为一行字符串，故采用：inputReader.ReadLine()