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  • F

    题目链接:

    https://cn.vjudge.net/contest/254150#problem/F

    wa代码:

    #include<iostream>
    #include<string>
    #include<cstring>
    #include<queue>
    #include<stdio.h>
    #include<stack>
    #include<map>
    #include<stack>
    using namespace std;
    # define maxn 100
    char a[10][maxn][maxn];
    int vis[maxn][maxn][maxn];
    int n,m,k;
    int f[2][4]= {{1,-1,0,0},{0,0,1,-1}};
    struct node
    {
        int x,y,z,step;
        node(int xx,int yy,int zz,int tt)
        {
            z=xx;
            x=yy;
            y=zz;
            step=tt;
        }
    };
    bool judge(int s1,int s2)
    {
        if(s1>=0&&s1<n&&s2>=0&&s2<m)return true;
        return false;
    }
    bool bfs(int t1,int t2,int t3)
    {
        memset(vis,0,sizeof(vis));
        queue<node>q;
        while(!q.empty())q.pop();
        q.push(node(t1,t2,t3,0));
        vis[t1][t2][t3]=1;
        while(!q.empty())
        {
            node temp=q.front();
            q.pop();
            if(a[temp.z][temp.x][temp.y]=='P')
            {
                if(temp.step<=k)
                    return true;
                    return false;
            }
            for(int i=0; i<4; i++)
            {
                int x=temp.x+f[0][i];
                int y=temp.y+f[1][i];
                if(judge(x,y)&&vis[temp.z][x][y]==0&&a[temp.z][x][y]!='*')
                {
                    vis[temp.z][x][y]=1;
                    if(a[temp.z][x][y]=='#')
                    {
                        if(temp.z==0)
                        {
                            if(a[1][x][y]!='*'&&a[1][x][y]!='#'&&vis[1][x][y]==0)
                            {
                                q.push(node(1,x,y,temp.step));
                                vis[1][x][y]=1;
                            }
                        }
                        else if(temp.z==1)
                        {
                            if(a[0][x][y]!='*'&&a[0][x][y]!='#'&&vis[0][x][y]==0)
                            {
                                q.push(node(0,x,y,temp.step));
                                vis[0][x][y]=1;
                            }
                        }
    
                    }
                    else
                    {
                        q.push(node(temp.z,x,y,temp.step+1));
                    }
                }
            }
        }
        return false;
    }
    int main()
    {
        int T;
        cin>>T;
        while(T--)
        {
        int t1,t2,t3;
            memset(a,'
    ',sizeof(a));
            cin>>n>>m>>k;
            for(int i=0; i<2; i++)
            {
                for(int j=0; j<n; j++)
                {
                    for(int l=0; l<m; l++)
                    {
                        cin>>a[i][j][l];
                        if(a[i][j][l]=='S'){
                        t1=i;
                        t2=j;
                        t3=l;
                        }
                    }
                }
            }
            if(bfs(t1,t2,t3))
                cout<<"YES"<<endl;
            else
                cout<<"NO"<<endl;
        }
        return 0;
    }
    
    

    AC代码:

    #include<iostream>
    #include<string>
    #include<cstring>
    #include<queue>
    #include<stdio.h>
    #include<stack>
    #include<map>
    #include<stack>
    using namespace std;
    # define maxn 15
    char a[2][maxn][maxn];
    int vis[maxn][maxn][maxn];
    int n,m,k;
    int f[2][4]= {{1,-1,0,0},{0,0,1,-1}};
    struct node
    {
        int x,y,z,step;
        node(int xx,int yy,int zz,int tt)
        {
            z=xx;
            x=yy;
            y=zz;
            step=tt;
        }
    };
    bool judge(int s1,int s2)
    {
        if(s1>=0&&s1<n&&s2>=0&&s2<m)return true;
        return false;
    }
    bool bfs(int t1,int t2,int t3)
    {
        memset(vis,0,sizeof(vis));
        queue<node>q;
        while(!q.empty())q.pop();
        q.push(node(t1,t2,t3,0));
        vis[t1][t2][t3]=1;
        while(!q.empty())
        {
            node temp=q.front();
            q.pop();
            if(a[temp.z][temp.x][temp.y]=='P')
            {
                if(temp.step<=k)
                    return true;
                return false;
            }
            if(a[temp.z][temp.x][temp.y]=='#')//原来一直wa的原因就在这里,应该是先判断,再去跑四个方向,否则的话,如果先跑四个方向再去判断的话,这样步数就会少算一步。
            {
                if(temp.z==0)
                {
                    if(a[1][temp.x][temp.y]!='*'&&a[1][temp.x][temp.y]!='#'&&vis[1][temp.x][temp.y]==0)
                    {
                        q.push(node(1,temp.x,temp.y,temp.step));
                        vis[1][temp.x][temp.y]=1;
                    }
                }
                else if(temp.z==1)
                {
                    if(a[0][temp.x][temp.y]!='*'&&a[0][temp.x][temp.y]!='#'&&vis[0][temp.x][temp.y]==0)
                    {
                        q.push(node(0,temp.x,temp.y,temp.step));
                        vis[0][temp.x][temp.y]=1;
    
                    }
                }
            }
            else
            {
                for(int i=0; i<4; i++)
                {
                    int x=temp.x+f[0][i];
                    int y=temp.y+f[1][i];
                    if(judge(x,y)&&vis[temp.z][x][y]==0&&a[temp.z][x][y]!='*')
                        q.push(node(temp.z,x,y,temp.step+1)),vis[temp.z][x][y]=1;
                }
            }
        }
        return false;
    }
    int main()
    {
        int T;
        cin>>T;
        while(T--)
        {
            int t1,t2,t3;
            memset(a,'
    ',sizeof(a));
            cin>>n>>m>>k;
            for(int i=0; i<2; i++)
            {
                for(int j=0; j<n; j++)
                {
                    for(int l=0; l<m; l++)
                    {
                        cin>>a[i][j][l];
                        if(a[i][j][l]=='S')
                        {
                            t1=i;
                            t2=j;
                            t3=l;
                        }
                    }
                }
            }
            if(bfs(t1,t2,t3))
                cout<<"YES"<<endl;
            else
                cout<<"NO"<<endl;
        }
        return 0;
    }
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  • 原文地址:https://www.cnblogs.com/letlifestop/p/10262914.html
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