poj 3050 Hopscotch

#include <set>#include <map>#include <queue>#include <stack>#include <cmath>#include <string>#include <cctype>#include <cstdio>#include <cstdlib>#include <cstring>#include <iomanip>#include <iostream>#include <algorithm>using namespace std;#define ls id<<1,l,mid#define rs id<<1|1,mid+1,r#define CLR(x) memset(x,0,sizeof x)#define MEM(x) memset(x,0x3f,sizeof x)#define rep(i,a,b) for (int i=a;i<b;i++)#define Rep(i,a,b) for (int i=a;i>=b;i--)typedef long long ll ;typedef pair<int,int> pii ;const int maxn = 1e5+50 ;const int inf = 0x3f3f3f3f ;const int MOD = 1e9+7 ;set<string>s; char a[5][5];int d[3]={0,1,-1};void dfs(int x,int y,string cur,int k) {if (k==5) {s.insert(cur);return ;}rep(i,0,3) rep(j,0,3) {if ((i==0&&j==0)||(i&&j)) continue ;int nx=x+d[i],ny=y+d[j];if (nx>4||nx<0||ny<0||ny>4) continue ;dfs(nx,ny,cur+a[nx][ny],k+1); }}int main () {rep(i,0,5) rep(j,0,5) cin >> a[i][j] ;rep(i,0,5) rep(j,0,5) {string t;t+=a[i][j];dfs(i,j,t,0);} cout << s.size() << endl ;return 0;}