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Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)
Total Submission(s): 12935 Accepted Submission(s): 8006
bfs & dfs
1 #include<math.h> 2 #include<stdio.h> 3 #include<queue> 4 #include<string.h> 5 #include<iostream> 6 #include<algorithm> 7 using namespace std; 8 #define N 1234 9 struct point 10 { 11 int x,y; 12 }st; 13 14 int n,m,ans; 15 int dx[]={0,0,1,-1}; 16 int dy[]={1,-1,0,0}; 17 char mat[N][N]; 18 int vis[N][N]; 19 20 void bfs() 21 { 22 queue<point>q; 23 q.push(st);vis[st.x][st.y]=1; 24 while(!q.empty()) 25 { 26 point cur=q.front(); 27 q.pop(); 28 ans++; 29 for(int i=0;i<4;i++) 30 { 31 point next=cur; 32 next.x+=dx[i];next.y+=dy[i]; 33 if(next.x<1||next.x>n||next.y<1||next.y>m)continue; 34 if(mat[next.x][next.y]==‘#‘||vis[next.x][next.y]==1)continue; 35 q.push(next);vis[next.x][next.y]=1; 36 } 37 } 38 } 39 void dfs(int x,int y) 40 { 41 if(x<1||x>n||y<1||y>m)return; 42 if(mat[x][y]==‘#‘||vis[x][y]==1)return; 43 vis[x][y]=1; 44 ans++; 45 for(int i=0;i<4;i++) 46 dfs(x+dx[i],y+dy[i]); 47 } 48 49 int main() 50 { 51 while(~scanf("%d%d",&m,&n)&&(m+n)) 52 { 53 memset(vis,0,sizeof(vis)); 54 for(int i=1;i<=n;i++) 55 for(int j=1;j<=m;j++) 56 { 57 scanf(" %c",&mat[i][j]); 58 if(mat[i][j]==‘@‘) 59 { 60 st.x=i;st.y=j; 61 } 62 } 63 ans=0; 64 bfs(); 65 // dfs(st.x,st.y); 66 cout<<ans<<endl; 67 } 68 return 0; 69 }
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原文地址:http://www.cnblogs.com/wmxl/p/4694359.html