题解 | #坐标移动#

#include <stdio.h>
#include <string.h>
#include <ctype.h>

int main(void)
{
    int x = 0, y = 0;
    char a[10001];
    int len;
    int index = -1; //记录上一次';'的位置
    int count = 0;
    
    scanf("%s", a);
    len = strlen(a); 

    for (int i = 0;i < len;i++) {
        if (a[i] == ';') {
            count = 0;
            if ((i - index) > 4 || (i - index) < 3) { //检查两次';'的字符串长度是否满足要求
                goto NEXT;
            }
            if (i - index == 4) {
                if (!isdigit(a[i - 2]))
                    goto NEXT;
                count = (a[i - 2] - '0') * 10; 
            }
            if (!isdigit(a[i - 1]))
                goto NEXT;
            count += a[i -1] - '0';

            switch(a[index + 1]) {
                case 'W':
                    y += count;
                    break;
                case 'A':
                    x -= count;
                    break;
                case 'S':
                    y -= count;
                    break;
                case 'D':
                    x += count;
                    break;
            }
NEXT:
            index = i;
            continue;
        }
    }

    printf("%d,%d\n", x, y);
    return 0;
}