作业：
#include <iostream>
using namespace std;
bool b[100][100]={0};
char map[100][100]={0};
int dx[4]={0,1,0,-1};
int dy[4]={1,0,-1,0};
int n,m;
int sx,sy,ex,ey;
int mink=2147483647;
void dfs(int,int,int);
int main(){cin>>n>>m;for(int i=1;i<=n;i++){for(int j=1;j<=m;j++){cin>>map[i][j];if(map[i][j]=='S'){sx=i;sy=j;}if(map[i][j]=='T'){ex=i;ey=j;}}}dfs(sx,sy,0);cout<<mink<<endl;;return 0;
}
void dfs(int x,int y,int k){if(x==ex&&y==ey){mink=min(k,mink);return;}for(int i=0;i<4;i++){int nx=x+dx[i];int ny=y+dy[i];if(b[nx][ny]==0&&map[nx][ny]!=0&&map[nx][ny]!='#'){b[nx][ny]=1;dfs(nx,ny,k+1);b[nx][ny]=0;}}}
#include <iostream>
using namespace std;
bool used[20]={0};//0-9
int r[20];
int l,sl;//1-n,l num
void dfs(int,int,int,int);
int main(){cin>>l>>sl;dfs(l,0,sl,-1);return 0;
}
void dfs(int n,int k,int sl,int last){if(k>=sl){for(int i=0;i<sl;i++){cout<<r[i]+1<<' ';}cout<<endl;return;}for(int i=last+1;i<n;i++){if(used[i]==0){r[k]=i;used[i]=1;dfs(n,k+1,sl,i);used[i]=0;}}}
