HDU 1033 Edge

题目不难，逆时针的时候注意，wa了好多次

wa的代码，错误
 1 #include <cstdio>
#include <cstring>
using namespace std;
struct Point{
    int x;int y;
}p[3];
int main()
{
    char c[205];
    while(~scanf("%s",c)){
        printf("300 420 moveto
310 420 lineto
");

        p[0].x=300;p[0].y=420;p[1].x=310;p[1].y=420;
        for(int i=0;i<strlen(c);i++){
            if(c[i]=='A'){
                if(p[i%3].x==p[i%3+1].x){
                    p[i%3+2].y=p[i%3+1].y;
                    p[i%3+2].x=p[i%3+1].x+p[i%3+1].y-p[i%3].y;
                }
                else{
                    p[i%3+2].x=p[i%3+1].x;
                    p[i%3+2].y=p[i%3+1].y-p[i%3+1].x+p[i%3].x;
                }
            }
            else if(c[i]=='V'){
                if(p[i%3].x==p[i%3+1].x){
                    p[i%3+2].y=p[i%3+1].y;
                    p[i%3+2].x=p[i%3+1].x-p[i%3+1].y+p[i%3].y;
                }
                else{
                    p[i%3+2].x=p[i%3+1].x;
                    p[i%3+2].y=p[i%3+1].y+p[i%3+1].x-p[i%3].x;
                }
            }
            printf("%d %d lineto
",p[i%3+2].x,p[i%3+2].y);
        }

        printf("stroke
showpage
");
    }

    return 0;
}

附ac代码

#include <cstdio>
#include <cstring>
using namespace std;

int main()
{
    char c[205];
    while(~scanf("%s",c)){
        printf("300 420 moveto
310 420 lineto
");
        int x=310,y=420,len=0;
        for(int i=0;i<strlen(c);i++){

            if(c[i]=='V'){

                switch(len){
                    case 0:y+=10;break;
                    case 1:x+=10;break;
                    case 2:y-=10;break;
                    case 3:x-=10;break;
                }
                len=(len+3)%4;//
            }
            else if(c[i]=='A'){
                switch(len){
                    case 2:y+=10;break;
                    case 1:x-=10;break;
                    case 0:y-=10;break;
                    case 3:x+=10;break;
                }
                len=(len+1)%4;
            }
            printf("%d %d lineto
",x,y);
        }

        printf("stroke
showpage
");
    }

    return 0;
}