uestc oj 1269 Children of the Candy Corn

来源：互联网发布：原版优化9拜占庭编辑：程序博客网时间：2024/05/17 05:13

Children of the Candy Corn
这个题目的纠结之处在于题意的理解还有就是代码的书写能力上。
就是两个深度搜索，一个广度搜索
深度搜索一个是沿着左手侧的一个是沿着右手侧的这两个处理起来较为麻烦，广搜简单。
处理的时候遵循方向原则沿着左手走的时候，先向左走，不行的话就向前走，然后向右走再不行就往回走
沿着右手走的时候，先向右走，不行的话就向前走，然后向左走，再不行就往回走
这里的方向都是相对的，比如向左走的的时候此时向”左“走就是向下了同理可得其他方向挨个遍历就行了
最后就可得出结论达到终点得出步数

#include<cstdio>#include<cstring>int T,w,h,startx,starty,endx,endy,head,tail,temp;char map[42][42];int vis[42][42];int dir[4][2]={1, 0,               -1,0,               0, 1,               0, -1};struct node{    int x;    int y;    int step;}que[42*42];void input(){    for(int i=0;i<h;i++)        {          for(int j=0;j<w;j++)           {              scanf("%c",&map[i][j]);              if(map[i][j]=='S')              {                  startx = i;                  starty = j;              }              if(map[i][j]=='E')              {                  endx = i;                  endy = j;              }           }        getchar();        }}int dfs_left(int x ,int y,int step,int dir){   if(map[x][y]=='E')   {       return step;   }   if(dir == 1)   {    //printf("%d  到了方向上\n",step);        if(y-1>=0&&(map[x][y-1]=='.'||map[x][y-1]=='E'))        {            dfs_left(x,y-1,step+1,3);        }        else if(x-1>=0&&(map[x-1][y]=='.'||map[x-1][y]=='E'))        {            dfs_left(x-1,y,step+1,1);//        }        else if(y+1<w&&(map[x][y+1]=='.'||map[x][y+1]=='E'))        {            dfs_left(x,y+1,step+1,4);        }        else        {            if(x+1<h&&(map[x+1][y]=='.'||map[x+1][y]=='E'))            dfs_left(x+1,y,step+1,2);           }   }   else if(dir ==2)   {        //printf("%d 到了方向下\n",step);        if(y+1<w&&(map[x][y+1]=='.'||map[x][y+1]=='E'))        {            dfs_left(x,y+1,step+1,4);        }        else if(x+1<h&&(map[x+1][y]=='.'||map[x+1][y]=='E'))        {            dfs_left(x+1,y,step+1,2);        }        else if(y-1>=0&&(map[x][y-1]=='.'||map[x][y-1]=='E'))        {            dfs_left(x,y-1,step+1,3);        }        else        {            if(x-1>=0&&(map[x-1][y]=='.'||map[x-1][y]=='E'))            dfs_left(x-1,y,step+1,1);        }   }  else  if(dir==3)   {         if(x+1<h&&(map[x+1][y]=='.'||map[x+1][y]=='E'))     {         dfs_left(x+1,y,step+1,2);     }     else if(y-1>=0&&(map[x][y-1]=='.'||map[x][y-1]=='E'))     {         dfs_left(x,y-1,step+1,3);     }     else if(x-1>=0&&(map[x-1][y]=='.'||map[x-1][y]=='E'))     {         dfs_left(x-1,y,step+1,1);     }     else     {         if(y+1<w&&(map[x][y+1]=='.'||map[x][y+1]=='E'))         dfs_left(x,y+1,step+1,4);     }   }  else  if(dir == 4)   {             if(x-1>=0&&(map[x-1][y]=='.'||map[x-1][y]=='E'))       {           dfs_left(x-1,y,step+1,1);       }       else if(y+1<w&&(map[x][y+1]=='.'||map[x][y+1]=='E'))       {           dfs_left(x,y+1,step+1,4);       }       else if(x+1<h&&(map[x+1][y]=='.'||map[x+1][y]=='E'))       {           dfs_left(x+1,y,step+1,2);       }       else       {   if(y-1>=0&&(map[x][y-1]=='.'||map[x][y-1]=='E'))           dfs_left(x,y-1,step+1,3);       }   }}int dfs_right(int x,int y ,int step,int dir){      if(map[x][y]=='E')      {          return step;      }      if(dir==1)      {          if(y+1<w&&(map[x][y+1]=='.'||map[x][y+1]=='E'))          {             dfs_right(x,y+1,step+1,4);          }          else if(x-1>=0&&(map[x-1][y]=='.'||map[x-1][y]=='E'))          {             dfs_right(x-1,y,step+1,1);          }          else if(y-1>=0&&(map[x][y-1]=='.'||map[x][y-1]=='E'))          {              dfs_right(x,y-1,step+1,3);          }          else if(x+1<h&&(map[x+1][y]=='.'||map[x+1][y]=='E'))          {              dfs_right(x+1,y,step+1,2);          }      }      else if(dir ==2)      {          if(y-1>=0&&(map[x][y-1]=='.'||map[x][y-1]=='E'))          {              dfs_right(x,y-1,step+1,3);          }          else if(x+1<h&&(map[x+1][y]=='.'||map[x+1][y]=='E'))          {              dfs_right(x+1,y,step+1,2);          }          else if(y+1<w&&(map[x][y+1]=='.'||map[x][y+1]=='E'))          {              dfs_right(x,y+1,step+1,4);          }          else if(x-1>=0&&(map[x-1][y]=='.'||map[x-1][y]=='E'))          {              dfs_right(x-1,y,step+1,1);          }      }      else if(dir==3)      {          if(x-1>=0&&(map[x-1][y]=='.'||map[x-1][y]=='E'))          {              dfs_right(x-1,y,step+1,1);          }          else if(y-1>=0&&(map[x][y-1]=='.'||map[x][y-1]=='E'))          {              dfs_right(x,y-1,step+1,3);          }          else if(x+1<h&&(map[x+1][y]=='.'||map[x+1][y]=='E'))          {              dfs_right(x+1,y,step+1,2);          }          else if(y+1<w&&(map[x][y+1]=='.'||map[x][y+1]=='E'))          {              dfs_right(x,y+1,step+1,4);          }      }      else if(dir ==4)      {          if(x+1<h&&(map[x+1][y]=='.'||map[x+1][y]=='E'))          {              dfs_right(x+1,y,step+1,2);          }          else if(y+1<w&&(map[x][y+1]=='.'||map[x][y+1]=='E'))          {              dfs_right(x,y+1,step+1,4);          }          else if(x-1>=0&&(map[x-1][y]=='.'||map[x-1][y]=='E'))          {              dfs_right(x-1,y,step+1,1);          }          else if(y-1>=0&&(map[x][y-1]=='.'||map[x][y-1]=='E'))          {              dfs_right(x,y-1,step+1,3);          }      }}int bfs(){    memset(vis,0,sizeof(vis));    head = tail = 0;    que[tail].x = startx;    que[tail].y = starty;    que[tail++].step = 1;    vis[startx][starty] = 1;    while(head<tail)    {        node front = que[head];        head++;        for(int i = 0;i<4;i++)        {            node temp;            int x = front.x + dir[i][0];            int y = front.y + dir[i][1];            if(x == endx&& y == endy)            {                return front.step+1;            }            if(x>=0&x<h&&y>=0&&y<w&&!vis[x][y]&&map[x][y]!='#')            {                temp.x = x;                temp.y = y;                temp.step = front.step+1;                que[tail++]=temp;                vis[x][y] = 1;            }        }    }}int main(){    //freopen("1.txt","r",stdin);    scanf("%d",&T);    while(T--)    {        scanf("%d%d",&w,&h);        getchar();        input();        printf("%d %d %d\n",dfs_left(startx,starty,1,3),dfs_right(startx,starty,1,4),bfs());    }    return 0;}