回溯5--马的遍历

 1 /*
 2 马的遍历 
 3 不用回头
 4  
 5 */
 6 #include <iostream>
 7 using namespace std;
 8 
 9 int ans[100][2];
10 int total=0;
11 
12 bool vis[100][100];
13 //row colum 
14 int horseRoad[5][2]={{0,0},{2,1},{1,2},{-1,2},{-2,1}};
15 
16 void print(int k){
17     total++;
18     cout<<total<<": "<<endl;
19     cout<<"("<<0<<","<<0<<")"<<" ";
20     for(int i=1;i<=k;i++){
21         cout<<"("<<ans[i][0]<<","<<ans[i][1]<<")"<<" ";
22     }
23     cout<<endl;
24 }
25 
26 void search(int r,int c,int k){
27     if(vis[4][8]==1) print(k-1);
28     else
29         for(int i=1;i<=4;i++){
30             int r1=r+horseRoad[i][0];
31             int c1=c+horseRoad[i][1];
32             if(r1>=0&&r1<=4&&c1>=0&&c1<=8){
33                 ans[k][0]=r1;
34                 ans[k][1]=c1;
35                 vis[r1][c1]=1;
36                 search(r1,c1,k+1);
37                 vis[r1][c1]=0;
38             }
39         }
40          
41 }
42 
43 int main(){
44     search(0,0,1);
45     cout<<total<<endl;
46     return 0;
47 }