HDU 1033 Edge

wa的代码，错误
 1 #include <cstdio>
 2 #include <cstring>
 3 using namespace std;
 4 struct Point{
 5     int x;int y;
 6 }p[3];
 7 int main()
 8 {
 9     char c[205];
10     while(~scanf("%s",c)){
11         printf("300 420 moveto\n310 420 lineto\n");
12 
13         p[0].x=300;p[0].y=420;p[1].x=310;p[1].y=420;
14         for(int i=0;i<strlen(c);i++){
15             if(c[i]==‘A‘){
16                 if(p[i%3].x==p[i%3+1].x){
17                     p[i%3+2].y=p[i%3+1].y;
18                     p[i%3+2].x=p[i%3+1].x+p[i%3+1].y-p[i%3].y;
19                 }
20                 else{
21                     p[i%3+2].x=p[i%3+1].x;
22                     p[i%3+2].y=p[i%3+1].y-p[i%3+1].x+p[i%3].x;
23                 }
24             }
25             else if(c[i]==‘V‘){
26                 if(p[i%3].x==p[i%3+1].x){
27                     p[i%3+2].y=p[i%3+1].y;
28                     p[i%3+2].x=p[i%3+1].x-p[i%3+1].y+p[i%3].y;
29                 }
30                 else{
31                     p[i%3+2].x=p[i%3+1].x;
32                     p[i%3+2].y=p[i%3+1].y+p[i%3+1].x-p[i%3].x;
33                 }
34             }
35             printf("%d %d lineto\n",p[i%3+2].x,p[i%3+2].y);
36         }
37 
38         printf("stroke\nshowpage\n");
39     }
40 
41     return 0;
42 }

 1 #include <cstdio>
 2 #include <cstring>
 3 using namespace std;
 4 
 5 int main()
 6 {
 7     char c[205];
 8     while(~scanf("%s",c)){
 9         printf("300 420 moveto\n310 420 lineto\n");
10         int x=310,y=420,len=0;
11         for(int i=0;i<strlen(c);i++){
12 
13             if(c[i]==‘V‘){
14 
15                 switch(len){
16                     case 0:y+=10;break;
17                     case 1:x+=10;break;
18                     case 2:y-=10;break;
19                     case 3:x-=10;break;
20                 }
21                 len=(len+3)%4;//
22             }
23             else if(c[i]==‘A‘){
24                 switch(len){
25                     case 2:y+=10;break;
26                     case 1:x-=10;break;
27                     case 0:y-=10;break;
28                     case 3:x+=10;break;
29                 }
30                 len=(len+1)%4;
31             }
32             printf("%d %d lineto\n",x,y);
33         }
34 
35         printf("stroke\nshowpage\n");
36     }
37 
38     return 0;
39 }