（入门）uva 227 Puzzle

#include <cstdio>
#include <cstring>
char puzzle[7][7];int p1,p2;
char readchar();
void setwall();
int move(const char);
int main()
{
int kase=0,first=1;
while(1)
{
char c,moves[100];

if((c=readchar())=='Z') return 0;
else {
int len_m;
puzzle[1][1]=c;
for(int k=2;k<=5;k++) puzzle[1][k]=getchar(); getchar();
for(int i=2;i<=5;i++){
for(int j=1;j<=5;j++){
puzzle[i][j]=getchar();
if(puzzle[i][j]==' ') p1=i,p2=j;
}
getchar();
}
setwall();
for(len_m=0;(moves[len_m]=readchar())!='0';len_m++); len_m=0;
if(first) first=0;
else printf("\n");
printf("Puzzle #%d:\n",++kase);
int n=strlen(moves);
for(int i=0;i<n;i++){
if(!move(moves[i])) {printf("This puzzle has no final configuration.\n");
goto ext;}
}
for(int i=1;i<6;i++){
first=1;
for(int j=1;j<6;j++)
{
if(first) first=0,printf("%c",puzzle[i][j]);
else printf( " %c",puzzle[i][j]);
}
printf("\n");
}
ext :;
}
}
}
char readchar(){
int c;
do(c=getchar()) ;while(c=='\n' || c=='\r' );
return c;
}
void setwall()
{
for(int i=1;i<=5;i++) puzzle[0][i]='\0',puzzle[i][0]='\0',puzzle[6][i]='\0',puzzle[i][6]='\0';
}
int move(const char ch){
switch(ch)
{
case 'A':
if(puzzle[p1-1][p2]=='\0') return 0;
puzzle[p1][p2]=puzzle[p1-1][p2];puzzle[--p1][p2]=' ';
break;
case 'B':
if(puzzle[p1+1][p2]=='\0') return 0;
puzzle[p1][p2]=puzzle[p1+1][p2];puzzle[++p1][p2]=' ';
break;
case 'L':
if(puzzle[p1][p2-1]=='\0') return 0;
puzzle[p1][p2]=puzzle[p1][p2-1];puzzle[p1][--p2]=' ';
break;
case 'R':
if(puzzle[p1][p2+1]=='\0') return 0;
puzzle[p1][p2]=puzzle[p1][p2+1];puzzle[p1][++p2]=' ';
break;
default:;
}
return 1;
}