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ytqkoala / aoapc-book

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刘老师您好，我想问一下书中dinic代码的cur数组功能 #21

Open GoogleCodeExporter opened 8 years ago

GoogleCodeExporter commented 8 years ago 
 只有这几处有涉及该数组
{{{
// UVa11248 Frequency Hopping：使用Dinic算法

  int cur[maxn];   // 当前弧指针
//=====================
  while(BFS()) {
      memset(cur, 0, sizeof(cur));
      flow += DFS(s, INF); 
    }

//=====================
 for(int& i = cur[x]; i < G[x].size(); i++) {
}}}

该数组自始至终都为0，请问它是怎么起到 
当前弧指针的作用的？谢谢

Original issue reported on code.google.com by lz1996...@gmail.com on 12 May 2013 at 7:37

GoogleCodeExporter commented 8 years ago 
看了下网上的代码，是不是应该在bfs时记录cur数组？

Original comment by lz1996...@gmail.com on 12 May 2013 at 8:06

GoogleCodeExporter commented 8 years ago 
注意这个：`int& i = 
cur[x]`，因为i是cur[x]的引用，所以i变化的时候cur[x]也会跟着��
�化 :)

Original comment by rujia....@gmail.com on 12 May 2013 at 12:58

GoogleCodeExporter commented 8 years ago 
谢谢，对c++不是很熟

Original comment by lz1996...@gmail.com on 13 May 2013 at 10:30

GoogleCodeExporter commented 8 years ago

Original comment by rujia....@gmail.com on 3 Sep 2013 at 4:57