jzoj 2044. 死者之魂推动遇难船

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</pre><img src="" alt="" /><p></p><p><img src="" alt="" />题目只有图片。。。。。。</p><p><img src="" alt="" /></p><p>思路</p><p>每条边进行判断然后跑一边bfs</p><p></p><pre code_snippet_id="1835826" snippet_file_name="blog_20160817_2_4417076" name="code" class="ruby">#include <stdio.h>#include <string>#include <cstring>using namespace std;int f[1002][1002];int x[1000000],y[1000000];int n,m,h,s;__attribute__((optimize("O2")))int bfs(){int head=0,tail=s+1,i,j;while (head<=tail){head++;if (f[x[head]+1][y[head]]==0&&x[head]+1>n-h&&x[head]+1<=n){tail++;x[tail]=x[head]+1;y[tail]=y[head];f[x[tail]][y[tail]]=2;}if (f[x[head]][y[head]+1]==0&&x[head]>n-h&&y[head]+1<=m){tail++;x[tail]=x[head];y[tail]=y[head]+1;f[x[tail]][y[tail]]=2;}if (f[x[head]-1][y[head]]==0&&x[head]-1>n-h&&x[head]-1>=1){tail++;x[tail]=x[head]-1;y[tail]=y[head];f[x[tail]][y[tail]]=2;}if (f[x[head]][y[head]-1]==0&&x[head]>n-h&&y[head]-1>=1){tail++;x[tail]=x[head];y[tail]=y[head]-1;f[x[tail]][y[tail]]=2;}} return 0;};__attribute__((optimize("O2")))int main(){     freopen("cruise.in","r",stdin);    freopen("cruise.out","w",stdout);   // memset(f,100000,sizeof(f));    char ch[1050];int i,j,k;scanf("%d%d%d",&n,&m,&h);for (i=1;i<=n;i++){    scanf("%s",&ch);for (j=1;j<=m;j++){f[i][j]=int(ch[j-1])-48;    }}s=0;for (i=1;i<=m;i++)if (f[1][i]==0&&1>n-h){s++;x[s]=1;y[s]=i;f[1][i]=2;}for (i=1;i<=m;i++)if (f[n][i]==0&&n>n-h){s++;x[s]=n;y[s]=i;f[n][i]=2;}for (i=1;i<=n;i++)if (f[i][1]==0&&i>n-h){s++;x[s]=i;y[s]=1;f[i][1]=2;}for (i=1;i<=n;i++)if (f[i][m]==0&&i>n-h){s++;x[s]=i;y[s]=m;f[i][m]=2;}   bfs();   for (i=1;i<=n;i++)   {    for (j=1;j<=m;j++){     printf("%d",f[i][j]);        }    printf("\n");   }   return 0;}
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