map美化bfs

这是我自认为写得比较好看的一个代码。就是简单的bfs，但是我用了map，使得整体非常好看

https://vjudge.net/contest/372814#problem/B

#include <bits/stdc++.h>
#define inf 2333333333333333
#define N 1000010
#define p(a) putchar(a)
#define For(i,a,b) for(long long i=a;i<=b;++i)

using namespace std;
long long h,n,m;
long long x[]={1,0,-1,0,0,0};
long long y[]={0,1,0,-1,0,0};
long long z[]={0,0,0,0,-1,1};

char a[32][32][32];

struct node{
    long long x;
    long long y;
    long long z;
    bool operator < (const node &o) const{
        if(x==o.x){
            if(y==o.y)
                return z<o.z;
            return y<o.y;
        }
        return x<o.x;
    }
}S,E;

map<node,long long>ans;
map<node,bool>vis;
queue<node>q;

void in(long long &x){
    long long y=1;char c=getchar();x=0;
    while(c<'0'||c>'9'){if(c=='-')y=-1;c=getchar();}
    while(c<='9'&&c>='0'){ x=(x<<1)+(x<<3)+c-'0';c=getchar();}
    x*=y;
}
void o(long long x){
    if(x<0){p('-');x=-x;}
    if(x>9)o(x/10);
    p(x%10+'0');
}

bool inside(node k){
    if(k.x<1 || k.x>n) return 0;
    if(k.y<1 || k.y>m) return 0;
    if(k.z<1 || k.z>h) return 0;
    return 1;
}

void bfs(){
    q.push(S);
    vis[S]=1;
    while(!q.empty()){
        node k=q.front(),temp;
        q.pop();
        For(i,0,5){
            temp.x=k.x+x[i];
            temp.y=k.y+y[i];
            temp.z=k.z+z[i];
            if(inside(temp) && !vis[temp] && a[temp.x][temp.y][temp.z]!='#'){
                vis[temp]=1;
                ans[temp]=ans[k]+1;
                q.push(temp);
            }
        }
    }
}

void init(){
    vis.clear();
    ans.clear();
}

signed main(){
    while(cin>>h>>n>>m&&(n|m|h)){
        init();
        For(k,1,h)
            For(i,1,n)
                For(j,1,m){
                    cin>>a[i][j][k];
                    if(a[i][j][k]=='S'){
                        S.x=i;S.y=j;S.z=k;
                    }
                    if(a[i][j][k]=='E'){
                        E.x=i;E.y=j;E.z=k;
                    }
                }
        bfs();
        if(vis[E]) cout<<"Escaped in "<<ans[E]<<" minute(s)."<<endl;
        else puts("Trapped!");
    }
    return 0;
}