hdu 1312 Red and Black && POJ 1979 Red and Black

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Red and Black

题目链接:

http://acm.hdu.edu.cn/showproblem.php?pid=1312

解题思路:

暴力直接搜就可以了,走过的地方标记一下就行了。。。

AC代码:

#include <iostream>#include <cstdio>#include <cstring>#include <queue>using namespace std;struct node{    int x,y;}no[450];const int dx[] = {-1,0,1,0},dy[] = {0,-1,0,1};int n,m;char maze[22][22];int vis[22][22];int cnt;void bfs(int i,int j){    memset(vis,0,sizeof(vis));    queue<node> q;    node cur;    cur.x = i;cur.y = j;    vis[i][j] = 1;    q.push(cur);    while(!q.empty()){        cur = q.front();        q.pop();        cnt++;        for(int i = 0; i < 4; i++){            int xx = cur.x+dx[i],yy = cur.y+dy[i];            if(xx<0 || xx >= m || yy<0 || yy >= n || maze[xx][yy] == '#' || vis[xx][yy])                continue;            node tmp;            tmp.x = xx;tmp.y = yy;            vis[xx][yy] = 1;            q.push(tmp);        }        /*for(int i = 0; i < m; i++)            printf("%s\n",maze[i]);        cout<<endl;*/    }}int main(){    while(scanf("%d%d",&n,&m),n+m){        cnt = 0;        for(int i = 0; i < m; i++)            scanf("%s",maze[i]);        for(int i = 0; i < m; i++)            for(int j = 0; j < n; j++){                if(maze[i][j] == '@'){                    bfs(i,j);                    break;                }            }        printf("%d\n",cnt);    }    return 0;}


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