codevs 1733 聪明的打字员 （Bfs）

/*
Bfs+Hash 跑的有点慢 但是codevs上时间限制10s 也ok
*/
#include<iostream>
#include<cstdio>
#include<cstring>
#include<queue>
#define maxn 10000010
using namespace std;
int len;
bool f[maxn];
string ls,rs;
struct node
{
    int step,place;
    string s;
};
queue<node>q;
int Hash(node x)
{
    int re=;
    len=x.s.length();
    for(int i=;i<=len-;i++)
      re=re*+x.s[i]-'';
    re=re*+x.place;
    return re;
}
int main()
{
    cin>>ls>>rs;
    ls=' '+ls;rs=' '+rs;
    node st;st.s=ls;
    st.step=;st.place=;
    q.push(st);f[Hash(st)]=;
    while(!q.empty())
      {
          node k=q.front();q.pop();
          string si=k.s;
          int p=k.place,t=k.step;
          if(si==rs)
          {
              cout<<t;
              return ;
          }
        for(int i=;i<=;i++)
          {
              int pi,ki;node x;
              string ss=si;
              if(i==&&p<)
              {
                pi=p;pi++;
                x.place=pi;x.step=t+;x.s=ss;
                int hash=Hash(x);
                    if(f[hash]==)
                      {
                          f[hash]=;
                          q.push(x);
                  }
              }
            else if(i==&&ss[p]<'')
              {
                  ss[p]++;pi=p;
                x.place=pi;x.step=t+;x.s=ss;
                int hash=Hash(x);
                    if(f[hash]==)
                      {
                          f[hash]=;
                          q.push(x);
                  }
              }
            else if(i==&&ss[p]>'')
              {
                  ss[p]--;pi=p;
                    x.place=pi;x.step=t+;x.s=ss;
                int hash=Hash(x);
                    if(f[hash]==)
                      {
                          f[hash]=;
                          q.push(x);
                  }
              }
            else if(i==)
              {
                  char tmps=ss[p];ss[p]=ss[];ss[]=tmps;pi=p;
                  x.place=pi;x.step=t+;x.s=ss;
                  int hash=Hash(x);
                    if(f[hash]==)
                      {
                          f[hash]=;
                          q.push(x);
                  }
              }
            else if(i==)
              {
                  char tmps=ss[p];ss[p]=ss[];ss[]=tmps;pi=p;
                  x.place=pi;x.step=t+;x.s=ss;
                  int hash=Hash(x);
                    if(f[hash]==)
                      {
                          f[hash]=;
                          q.push(x);
                  }
              }
             else if(i==&&p>)
              {
                pi=p;pi--;
                x.place=pi;x.step=t+;x.s=ss;
                int hash=Hash(x);
                    if(f[hash]==)
                      {
                          f[hash]=;
                          q.push(x);
                  }
              }
          }
      }
    return ;
}

/*
加上剪枝的话就ok了 200ms
对于2 3 4 5这几个点 左移右移对答案是没有贡献的 只有1 6 左移右移再加上swap0 1才有贡献
所以2 3 4 5这几个只有已经和目标相同了才左右移
*/
#include<iostream>
#include<cstdio>
#include<cstring>
#include<queue>
#define maxn 10000010
using namespace std;
int len;
bool f[maxn];
string ls,rs;
struct node
{
    int step,place;
    string s;
};
queue<node>q;
int Hash(node x)
{
    int re=;
    len=x.s.length();
    for(int i=;i<=len-;i++)
      re=re*+x.s[i]-'';
    re=re*+x.place;
    return re;
}
int main()
{
    //freopen("clever.in","r",stdin);
    //freopen("clever.out","w",stdout);
    cin>>ls>>rs;
    ls=' '+ls;rs=' '+rs;
    node st;st.s=ls;
    st.step=;st.place=;
    q.push(st);f[Hash(st)]=;
    while(!q.empty())
      {
          node k=q.front();q.pop();
          string si=k.s;
          int p=k.place,t=k.step;
          if(si==rs)
          {
              cout<<t;
              return ;
          }
        for(int i=;i<=;i++)
          {
              int pi,ki;node x;
              string ss=si;
              if(i==&&p<)
              {
                  if((p==||p==||p==)&&ss[p]!=rs[p])continue;
                pi=p;pi++;
                x.place=pi;x.step=t+;x.s=ss;
                int hash=Hash(x);
                    if(f[hash]==)
                      {
                          f[hash]=;
                          q.push(x);
                  }
              }
            else if(i==&&ss[p]<'')
              {
                  ss[p]++;pi=p;
                x.place=pi;x.step=t+;x.s=ss;
                int hash=Hash(x);
                    if(f[hash]==)
                      {
                          f[hash]=;
                          q.push(x);
                  }
              }
            else if(i==&&ss[p]>'')
              {
                  ss[p]--;pi=p;
                    x.place=pi;x.step=t+;x.s=ss;
                int hash=Hash(x);
                    if(f[hash]==)
                      {
                          f[hash]=;
                          q.push(x);
                  }
              }
            else if(i==)
              {
                  char tmps=ss[p];ss[p]=ss[];ss[]=tmps;pi=p;
                  x.place=pi;x.step=t+;x.s=ss;
                  int hash=Hash(x);
                    if(f[hash]==)
                      {
                          f[hash]=;
                          q.push(x);
                  }
              }
            else if(i==)
              {
                  char tmps=ss[p];ss[p]=ss[];ss[]=tmps;pi=p;
                  x.place=pi;x.step=t+;x.s=ss;
                  int hash=Hash(x);
                    if(f[hash]==)
                      {
                          f[hash]=;
                          q.push(x);
                  }
              }
             else if(i==&&p>)
              {
                  if((p==||p==||p==)&&ss[p]!=rs[p])continue;
                pi=p;pi--;
                x.place=pi;x.step=t+;x.s=ss;
                int hash=Hash(x);
                    if(f[hash]==)
                      {
                          f[hash]=;
                          q.push(x);
                  }
              }
          }
      }
    return ;
}