A. The Fault in Our Cubes 暴力dfs

http://codeforces.com/gym/101257/problem/A

把它固定在（0，0, 0）到（2， 2， 2）上，每次都暴力dfs检查，不会超时的，因为规定在这个空间上，一不行，就会早早退出。

这样写起来比较好写。

#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <cmath>
#include <algorithm>
#include <assert.h>
#define IOS ios::sync_with_stdio(false)
using namespace std;
#define inf (0x3f3f3f3f)
typedef long long int LL;

#include <iostream>
#include <sstream>
#include <vector>
#include <set>
#include <map>
#include <queue>
#include <string>
#include <bitset>
const int maxn =  + ;
bool vis[][][];
char str[maxn];
int fx[] = {, , , -, , };
int fy[] = {, , -, , , };
int fz[] = {, , , , -, };
bool check(int x, int y, int z) {
    if (x <  || y <  || z < ) return false;
    if (x >  || y >  || z > ) return false;
    if (vis[x][y][z]) return false;
    return true;
}
int op[];
bool dfs(int cur, int x, int y, int z, int dir) {
    int tx = fx[dir] + x, ty = fy[dir] + y, tz = fz[dir] + z;
    if (cur == ) {
        if (check(tx, ty, tz)) return true;
        else return false;
    }
    if (!check(tx, ty, tz)) return false;
    if (str[cur] == 'I') {
        vis[tx][ty][tz] = true;
        if (dfs(cur + , tx, ty, tz, dir)) {
            return true;
        } else {
            vis[tx][ty][tz] = false;
            return false;
        }
    } else {
        vis[tx][ty][tz] = true;
        for (int i = ; i < ; ++i) {
            if (dir == i || op[dir] == i) continue;
            if (dfs(cur + , tx, ty, tz, i)) {
                return true;
            }
        }
        vis[tx][ty][tz] = false;
        return false;
    }
}
void work() {
    op[] = ;
    op[] = ;
    op[] = ;
    op[] = ;
    op[] = ;
    op[] = ;
    scanf("%s", str + );
    for (int i = ; i <= ; ++i) {
        if (str[i] == 'E') {
            cout << "NO" << endl;
            return;
        }
    }
    for (int i = ; i < ; ++i) {
        for (int j = ; j < ; ++j) {
            for (int k = ; k < ; ++k) {
                vis[i][j][k] = true;
                if (dfs(, i, j, k, )) {
                    cout << "YES" << endl;
                    return;
                }
                vis[i][j][k] = false;
            }
        }
    }
    cout << "NO" << endl;
}

int main() {
#ifdef local
    freopen("data.txt", "r", stdin);
//    freopen("data.txt", "w", stdout);
#endif
    work();
    return ;
}