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  • 题解 SP1841 【PPATH

    模拟赛考到了这个题,但我傻傻的用了(DFS),于是爆了零

    后来才想明白,因为搜索树的分支很多,但答案的深度却又没有那么深,所以在这里(BFS),而(DFS)一路搜到底的做法则会稳稳地(T)飞掉

    其他细节请看代码注释

    (code:)

    #include<bits/stdc++.h>
    #define maxn 10010
    using namespace std;
    template<typename T> inline void read(T &x)
    {
    	x=0;char c=getchar();bool flag=false;
    	while(!isdigit(c)){if(c=='-')flag=true;c=getchar();}
    	while(isdigit(c)){x=x*10+(c^48);c=getchar();}
    	if(flag)x=-x;
    }
    bool 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0,0,0,0,0,0};
    bool vis[maxn];//质数表,为搜索判断质数
    int m,a,b,ans;
    struct node
    {
    	int num;
    	int cnt;
    };
    void bfs()
    {
    	queue<node> q;
    	q.push((node){a,0});
    	while(!q.empty())
    	{
    		int x=q.front().num,cnt=q.front().cnt;
    		if(x==b)//找到答案,退出循环,因BFS的性质,此时一定为最优解
    		{
    			ans=cnt;
    			break;
    		}
    		int base=1,y,to;
    		for(int i=1;i<=4;++i)//循环将哪一位更改
    		{
    			y=x-((x/base)%10)*base;
    			for(int j=0;j<=9;++j)//循环改成什么数字	
    			{
    				if(i==4&&j==0) continue;
    				to=y+j*base;
    				if(pr[to]&&!vis[to])
    				{
    					vis[to]=true;
    					q.push((node){to,cnt+1});
    				}
    			}
    			base*=10;
    		}
    		q.pop();
    	}
    }
    void clear()//多组数据,清空
    {
    	ans=-1;
    	memset(vis,0,sizeof(vis));
    }
    int main()
    {
    	read(m);
    	while(m--)
    	{
    		clear();
    		read(a),read(b);
    		bfs();
    		if(ans==-1)
    		puts("Impossible");//若没有答案
    		else
    		printf("%d
    ",ans);
    	}
    	return 0;
    }
    
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  • 原文地址:https://www.cnblogs.com/lhm-/p/12229809.html
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