题解 | 坐标移动

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main() {
    int x = 0, y = 0;
    char act[4];
    while (scanf("%[^;]", act) != EOF) { 
        getchar();
        if(act[0]!='A'&&act[0]!='D'&&act[0]!='W'&&act[0]!='S'){
            continue;
        }else if (strlen(act)>3) {
            continue;
        }else if (act[1]<'0'||act[1]>'9') {
            continue;
        }
        if (strlen(act)==3) {
            if (act[2]<'0'||act[2]>'9') {
            continue;
            }
        }
        if(act[0] == 'A'){
            x-=atoi(&act[1]);
        }else if (act[0] == 'W') {
            y+=atoi(&act[1]);
        }else if (act[0] == 'S') {
            y-=atoi(&act[1]);
        }else if (act[0] == 'D') {
            x+=atoi(&act[1]);
        }
    }
    printf("%d,%d", x, y);
    return 0;
}