linshi18

#include<iostream>
using namespace std;
int n,m,k;
#define max 100
char mmap[max][max];
int mmin;
#define MIN(a,b) ((a)<(b)?(a):(b));
int x1,x2,y1,y2;
int mmde[4][2]={{0,-1},{1,0},{0,1},{-1,0}};
int visited[max][max];
void dfs(int x,int y,int sum){
     if(mmap[x][y]=='3'){
         mmin=MIN(sum,mmin);              
            return;           }
      else {
           int i;
           int mx,my;
           for(i=0;i<4;i++){
                mx=x+mmde[i][0];
                my=y+mmde[i][1];     
               
            if(visited[mx][my]==1||mx<1||mx>n||my<1||my>m||(sum%k!=0&&mmap[mx][my]=='0'))
            {continue;}
            else if(abs(mx-x2)+abs(my-y2)+sum>mmin)continue;
            else 
            {
                 visited[mx][my]=1;   
            dfs(mx,my,sum+1); 
            visited[mx][my]=0;  }  
                            }
                            
           
           }      
     }
int main(){
    //scanf("%d%d%d",&n,&m,&k);
    while(cin>>n>>m>>k){
    int i,j;
    memset(visited,0,sizeof(visited));
    mmin=10000;
    for(i=1;i<=n;i++){
      for(j=1;j<=m;j++){
         cin>>mmap[i][j];
         if(mmap[i][j]=='1')
         {x1=i;y1=j;}
         else if(mmap[i][j]=='3')
         {x2=i;y2=j;}
                        }                
                      }
      visited[x1][y1]=1; 
      dfs(x1,y1,0);                
      printf("%d\n",mmin);   
      }                 
    }

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