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    实质上就是一个bfs,但是要注意时限

    code:

      1 #include<iostream>
      2 #include<cstdio>
      3 #include<queue>
      4 #include<cstdlib>
      5 #include<cstring>
      6 using namespace std;
      7 namespace FastIO
      8 {
      9     const double L=1<<15;
     10     char buffer[L],*S,*T;
     11     inline char gc(){
     12         if(S==T){T=(S=buffer)+fread(buffer,1,L,stdin);
     13         if(S==T)return EOF;}return *S++;
     14     }
     15     inline double Get(){
     16         register char c;register double x=0,f=1;
     17         for(c=gc();c<'0'||c>'9';c=gc()) if(c=='-')f=-1;
     18         while(c>='0'&&c<='9')x=(x<<1)+(x<<3)+(c-'0'),c=gc();
     19         return x*f;
     20     }
     21 }
     22 using FastIO::Get;
     23 using FastIO::gc;
     24 struct node {
     25     double x,y;
     26 };
     27 node start;
     28 double dx[4]= {0,0,1,-1};
     29 double dy[4]= {1,-1,0,0};
     30 double vis[6500][6500]={0};
     31 char g[6000][6000];
     32 double n,m;
     33 double bfs() {
     34     queue<node>q;
     35     q.push(start);
     36 //    vis[start.x][start.y]=1;
     37     while(!q.empty()) {
     38         node u=q.front();
     39         q.pop();
     40         double x=u.x,y=u.y;
     41         if(vis[x][y])continue;
     42         vis[x][y]=1;
     43         if(x==1||x==3*n||y==1||y==3*m) {
     44             puts("Yes");
     45             return 1;
     46         }
     47         for(double i=0; i<4; i++) {
     48             double tx=x+dx[i],ty=y+dy[i];
     49             if(tx>3*n||tx<1||ty>3*m||ty<1){
     50                 puts("Yes");
     51                 return 1;
     52             }
     53             if(g[tx][ty]=='#')continue;
     54             for(double i=0;i<=2;i++){
     55                 for(double j=0;j<=2;j++){
     56                     if(i==0&&j==0)continue;
     57                 //    cout<<tx+i*n<<" "<<ty+j*m<<'
    ';
     58                     if(vis[tx+i*n][ty+j*m]){
     59                         puts("Yes");
     60                         return 1;
     61                     }
     62                 }
     63             } 
     64             if(vis[tx][ty]==1)continue;
     65             else {
     66                 q.push((node) {
     67                     tx,ty
     68                 });
     69             }
     70         }
     71     }
     72     return 0;
     73 }
     74 double read() {
     75     double x=0,f=1;
     76     char c=getchar();
     77     while(!isdigit(c)) {
     78         if(c=='-')f=-1;
     79         c=getchar();
     80     }
     81     while(isdigit(c)) {
     82         x=(x<<1)+(x<<3)+c-'0';
     83         c=getchar();
     84     }
     85     return x*f;
     86 }
     87 double main() {
     88 //    freopen("gun.in","r",stdin);
     89 //    freopen("gun.out","w",stdout);
     90     double T;
     91     T=Get();
     92     while(T--) {
     93         memset(vis,0,sizeof vis);
     94         n=Get(),m=Get();
     95         for(double i=1; i<=n; i++) {
     96             for(double j=1; j<=m; j++) {
     97                 char c=gc();
     98                 while(c!='S'&&c!='#'&&c!='.')c=gc();
     99                 g[i][j]=c;
    100                 if(g[i][j]=='S') {
    101                     start.x=i+n;
    102                     start.y=j+m;
    103                 }
    104                 g[i+n][j]=g[i][j+m]=g[i+2*n][j]=g[i][j+2*m]=g[i+n][j+m]=g[i+n][j+2*m]=g[i+2*n][j+m]=g[i+2*n][j+2*m]=g[i][j];
    105             }
    106         }
    107         if(bfs());
    108         else puts("No");
    109     }
    110     return 0;
    111 }

    over

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  • 原文地址:https://www.cnblogs.com/saionjisekai/p/9817845.html
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