题解 | 坐标移动

package main

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

func main() {
	in := bufio.NewReader(os.Stdin)
	s, _ := in.ReadString('\n')
	s = strings.TrimSpace(s)
	x, y := 0, 0
	parts := strings.Split(s, ";")
	for _, cmd := range parts {
		if len(cmd) == 0 {
			continue
		}
		if len(cmd) != 2 && len(cmd) != 3 {
			continue
		}
		if cmd[0] != 'A' && cmd[0] != 'D' && cmd[0] != 'W' && cmd[0] != 'S' {
			continue
		}
		d := 0
		numStr := cmd[1:]
		ok := true
		for i := 0; i < len(numStr); i++ {
			if numStr[i] < '0' || numStr[i] > '9' {
				ok = false
				break
			}
			d = d*10 + int(numStr[i]-'0')
		}
		if !ok {
			continue
		}
		switch cmd[0] {
		case 'A':
			x -= d
		case 'D':
			x += d
		case 'W':
			y += d
		case 'S':
			y -= d
		}
	}
	fmt.Printf("%v,%v\n", x, y)
}