2019第十届蓝桥杯B组决赛题解第五题

#include<iostream>
#include<stdio.h>
#include<string.h>
using namespace std;
int dp[7][7];
int ans=0;
int dx[]={-1,1,0,0};
int dy[]={0,0,-1,1};
bool vis[7][7];
void output() {
    for(int i = 1;i<= 6;i++) {
        for(int j = 1;j<= 6;j++) {
            cout<<vis[i][j]<<' ';
        }
        cout<<endl;
    }
    cout<<endl<<endl;
}
void dfs(int x,int y,int t){
    if(t>12){
        return ;
    }    
    if(x==0&&y==0&&vis[x][y]==true){
        ans++;
        output();
        return ;
    }
    for(int i=0;i<4;i++){
        int xx = x+dx[i];
        int yy = y+dy[i];
        if(xx>=0&&xx<=5&&y>=0&&y<=5&&!vis[xx][yy]){
            vis[xx][yy] = true;
            dfs(xx,yy,t+1);
            vis[xx][yy] = false;
        }
    } 
}

int main(){
    memset(dp,0,sizeof(dp));
    memset(vis,false,sizeof(vis));
    dfs(0,0,0);
    cout<<ans-2<<endl;
    return 0;
}