[kuangbin带你飞]专题一 简单搜索 - N - Find a way

正确代码:

 1 #include<iostream>
 2 #include<queue>
 3 #define N 210
 4 #define inf 0xffffff
 5 using namespace std;
 6 int m,n,mark[N][N],dis[N][N][2],dir[4][2]={1,0, 0,1, -1,0, 0,-1},flag;
 7 char s[N][N];
 8 struct node{
 9    int x,y,step;
10 };
11 bool judge(int x,int y)
12 {
13    if(x>=0 && x<m && y>=0 && y<n && s[x][y]!='#' && mark[x][y]==0)
14        return 1;
15    return 0;
16 }
17 void bfs(int x,int y)
18 {
19    int k;
20    queue<node>q;
21    node cur,next;
22    cur.x=x;cur.y=y;cur.step=0;
23    mark[x][y]=1;
24    q.push(cur);
25    while(!q.empty())
26    {
27        cur=q.front();
28        q.pop();
29        next.step=cur.step+1;
30        for(k=0;k<4;k++)
31        {
32            next.x=x=cur.x+dir[k][0];
33            next.y=y=cur.y+dir[k][1];
34            if(judge(x,y))
35            {
36                mark[x][y]=1;
37                if(s[x][y]=='@')
38                    dis[x][y][flag]=next.step;
39                q.push(next);
40            }
41        }
42    }
43 }
44 
45 int main()
46 {
47    int i,j,min;
48    while(scanf("%d %d",&m,&n)!=-1)
49    {
50        min=inf;
51        for(i=0;i<m;i++)
52            for(j=0;j<n;j++)
53                dis[i][j][0]=dis[i][j][1]=inf;
54 
55        for(i=0;i<m;i++)
56            scanf("%s",s[i]);
57        for(i=0;i<m;i++)
58            for(j=0;j<n;j++)
59            {
60                if(s[i][j]=='Y')
61                {
62                    flag=0;
63                    memset(mark,0,sizeof(mark));
64                    bfs(i,j);
65                }
66                else if(s[i][j]=='M')
67                {
68                    flag=1;
69                    memset(mark,0,sizeof(mark));
70                    bfs(i,j);
71                }
72            }
73        for(i=0;i<m;i++)
74            for(j=0;j<n;j++)
75                if(s[i][j]=='@' && min>dis[i][j][0]+dis[i][j][1])
76                    min=dis[i][j][0]+dis[i][j][1];
77            printf("%d\n",min*11);
78    }
79    return 0;
80 }

被逼疯代码:

  1 #include<iostream>
  2 #include<cstdio>
  3 #include<cstring>
  4 #include<algorithm>
  5 #include<queue>
  6 #define INF 0x3f3f3f3f  
  7 using namespace std;
  8 struct node
  9 {
 10     int x;
 11     int y;
 12     int step;
 13 };
 14 char g[205][205];
 15 int stepA[205][205];
 16 int stepB[205][205];
 17     queue<node>q;
 18 int yx, yy, mx, my; 
 19 int x, y;
 20 long long ans;
 21 int d[4][2]={{0,1},{1,0},{0,-1},{-1,0}};
 22 
 23 int main()
 24 {
 25 //    freopen("in.in","r",stdin);
 26 //    freopen("out.txt","w",stdout);
 27     while(scanf("%d%d",&x,&y)!=EOF)
 28     {
 29         memset(g,0,sizeof(g));
 30         memset(stepA,-1,sizeof(stepA));
 31         memset(stepB,-1,sizeof(stepB));
 32         char tmp[205];
 33         for(int i = 1; i <= x; i++)
 34         {
 35             scanf("%s",tmp);
 36             for(int j = 1; j <= y; j++)
 37             {
 38                 if(tmp[j-1]=='Y')
 39                 {
 40                     yx = i;
 41                     yy = j;
 42                 }
 43                 if(tmp[j-1]=='M')
 44                 {
 45                     mx = i;
 46                     my = j;
 47                 }
 48                 g[i][j] = tmp[j-1];
 49             }
 50         }
 51         ans = INF;
 52 
 53         node s, t;
 54     
 55         s.x = yx;
 56         s.y = yy;
 57         s.step = 0;
 58         q.push(s);
 59         while(q.size())
 60         {
 61             s = q.front();
 62             q.pop();
 63             stepA[s.x][s.y] = s.step;
 64             for(int i = 0; i < 4; i++)
 65             {
 66                 t.x = s.x + d[i][0];
 67                 t.y = s.y + d[i][1];
 68                 t.step = s.step + 1;
 69                 if(stepA[t.x][t.y] != -1)    continue;
 70                 if(g[t.x][t.y]=='.'|| g[t.x][t.y]=='@')
 71                     q.push(t);
 72             }
 73         }
 74         s.x = mx;
 75         s.y = my;
 76         s.step = 0;
 77         q.push(s);
 78         while(q.size())
 79         {
 80             s = q.front();
 81             q.pop();
 82             stepB[s.x][s.y] = s.step;
 83             for(int i = 0; i < 4; i++)
 84             {
 85                 t.x = s.x + d[i][0];
 86                 t.y = s.y + d[i][1];
 87                 t.step = s.step + 1;
 88                 if(stepB[t.x][t.y] != -1)    continue;
 89                 if(g[t.x][t.y]=='.'|| g[t.x][t.y]=='@')
 90                     q.push(t);
 91             }
 92         }
 93         for(int i = 1; i <= x; i++)
 94         {
 95             for(int j = 1; j <= y; j++)
 96             {
 97                 if(g[i][j]=='@' && stepA[i][j]+stepB[i][j]<ans && stepA[i][j]!=-1 && stepB[i][j]!=-1)
 98                     ans = stepA[i][j]+stepB[i][j];
 99             }            
100         }
101         cout<<ans*11<<endl;
102     }
103     
104     return 0;
105 }

 

posted @ 2015-01-30 16:13  天I火  阅读(516)  评论(0编辑  收藏  举报