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RE G++.神牛帮我看看#include<stdio.h>
#include<string.h>
const int WIDTH=20;
int row,col,entry;
int flag[WIDTH][WIDTH];
char grid[WIDTH][WIDTH];
int main()
{
int i,j;
while(scanf("%d%d%d",&row,&col,&entry))
{
if(!row&&!col&&!entry)
break;
memset(flag,0,sizeof(flag));
for(i=0;i<row;i++)
scanf(" %s",grid[i]);
bool Dis=true;
i=0;j=entry-1;
flag[i][j]=1;
int ni,nj;
while(1)
{
if(i<0||j<0||i>=row||j>=col)break;
ni=i;nj=j;
if(grid[ni][nj]=='N')
{
i--;
if(flag[i][j]){Dis=false;break;}
if(i<row-1)
flag[i][j]=flag[i+1][j]+1;
}
else if(grid[ni][nj]=='S')
{
i++;
if(flag[i][j]){Dis=false;break;}
if(i>0)
flag[i][j]=flag[i-1][j]+1;
}
else if(grid[ni][nj]=='W')
{
j--;
if(flag[i][j]){Dis=false;break;}
if(j<col-1)
flag[i][j]=flag[i][j+1]+1;
}
else if(grid[ni][nj]=='E')
{
j++;
if(flag[i][j]){Dis=false;break;}
if(j>0)
flag[i][j]=flag[i][j-1]+1;
}
}
if(Dis)
printf("%d step(s) to exit\n",flag[ni][nj]);
else
{
printf("%d step(s) before a loop of %d step(s)\n",flag[i][j]-1,flag[ni][nj]-flag[i][j]+1);
}
}
return 0;
}
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