题解 | 坐标移动

package main

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

var scanner = bufio.NewScanner(os.Stdin)

type Point1 struct {
	X int
	Y int
}

func (p *Point1) MoveLeft(step int) *Point1 {
	p.X -= step
	return p
}

func (p *Point1) MoveRight(step int) *Point1 {
	p.X += step
	return p
}

func (p *Point1) MoveUp(step int) *Point1 {
	p.Y += step
	return p
}

func (p *Point1) MoveDown(step int) *Point1 {
	p.Y -= step
	return p
}

func (p *Point1) Move(command string) *Point1 {
	if len(command) < 2 {
		return p
	}
    step, _ := strconv.Atoi(command[1:])
	switch command[:1] {
	case "A":
		p.MoveLeft(step)
	case "D":
		p.MoveRight(step)
	case "W":
		p.MoveUp(step)
	case "S":
		p.MoveDown(step)
	}
	return p
}

func main() {
	scanner.Scan()
	commands := strings.Split(strings.Trim(scanner.Text(), ";"), ";")
	p := &Point1{0, 0}
	for _, command := range commands {
		p.Move(command)
	}

	fmt.Printf("%d,%d", p.X, p.Y)
}