Clone an undirected graph. Each node in the graph contains a label and a list of its neighbors.

OJ's undirected graph serialization:

Nodes are labeled uniquely.
We use # as a separator for each node, and , as a separator for node label and each neighbor of the node.

As an example, consider the serialized graph {0,1,2#1,2#2,2}.

The graph has a total of three nodes, and therefore contains three parts as separated by #.

First node is labeled as 0. Connect node 0 to both nodes 1 and 2.
    Second node is labeled as 1. Connect node 1 to node 2.
    Third node is labeled as 2. Connect node 2 to node 2 (itself), thus forming a self-cycle.

Visually, the graph looks like the following:

1
      / \
     /   \
    0 --- 2
         / \
         \_/
解题思路:

BFS或DFS均可做出,BFS的JAVA实现如下:

    public UndirectedGraphNode cloneGraph(UndirectedGraphNode node) {
if (node == null)
return null;
Queue<UndirectedGraphNode> queue = new LinkedList<UndirectedGraphNode>();
HashMap<UndirectedGraphNode, UndirectedGraphNode> map = new HashMap<UndirectedGraphNode, UndirectedGraphNode>();
UndirectedGraphNode newHead = new UndirectedGraphNode(node.label);
queue.add(node);
map.put(node, newHead); while (!queue.isEmpty()) {
UndirectedGraphNode curr = queue.poll();
List<UndirectedGraphNode> currNeighbors = curr.neighbors;
for (UndirectedGraphNode aNeighbor : currNeighbors)
if (!map.containsKey(aNeighbor)) {
UndirectedGraphNode copy = new UndirectedGraphNode(
aNeighbor.label);
map.put(aNeighbor, copy);
map.get(curr).neighbors.add(copy);
queue.add(aNeighbor);
} else
map.get(curr).neighbors.add(map.get(aNeighbor));
}
return newHead;
}

DFS 实现如下:

	Map<UndirectedGraphNode, UndirectedGraphNode> map = new HashMap<UndirectedGraphNode, UndirectedGraphNode>();

	public UndirectedGraphNode cloneGraph(UndirectedGraphNode node) {
if (node == null)
return null;
if (map.containsKey(node))
return map.get(node);
UndirectedGraphNode newHead = new UndirectedGraphNode(node.label);
map.put(node, newHead);
for (UndirectedGraphNode aNeighbor : node.neighbors)
newHead.neighbors.add(cloneGraph(aNeighbor));
return newHead;
}

Java for LeetCode 133 Clone Graph的更多相关文章

  1. [LeetCode] 133. Clone Graph 克隆无向图

    Clone an undirected graph. Each node in the graph contains a label and a list of its neighbors. OJ's ...

  2. leetcode 133. Clone Graph ----- java

    Clone an undirected graph. Each node in the graph contains a label and a list of its neighbors. OJ's ...

  3. [leetcode]133. Clone Graph 克隆图

    题目 给定一个无向图的节点,克隆能克隆的一切 思路 1--2 | 3--5 以上图为例, node    neighbor 1         2, 3 2         1 3         1 ...

  4. Leetcode#133 Clone Graph

    原题地址 方法I,DFS 一边遍历一边复制 借助辅助map保存已经复制好了的节点 对于原图中每个节点,如果已经复制过了,直接返回新节点的地址,如果没复制过,则复制并加入map中,接着依次递归复制其兄弟 ...

  5. 133. Clone Graph 138. Copy List with Random Pointer 拷贝图和链表

    133. Clone Graph Clone an undirected graph. Each node in the graph contains a label and a list of it ...

  6. 【LeetCode】133. Clone Graph (3 solutions)

    Clone Graph Clone an undirected graph. Each node in the graph contains a label and a list of its nei ...

  7. 133. Clone Graph

    题目: Clone an undirected graph. Each node in the graph contains a label and a list of its neighbors. ...

  8. [Leetcode Week3]Clone Graph

    Clone Graph题解 原创文章,拒绝转载 题目来源:https://leetcode.com/problems/clone-graph/description/ Description Clon ...

  9. 133. Clone Graph (3 solutions)——无向无环图复制

    Clone Graph Clone an undirected graph. Each node in the graph contains a label and a list of its nei ...

随机推荐

  1. 维护一套同时兼容 iOS 6 和 iOS 7,并且能够自动适应两个系统的 UI 风格的代码

    举例:ios6:test.pngios7:ios7_test.png在ios7Image.plist中添加 "test" PS:如果要统一成ios7风格,可以看看UI7Kit yo ...

  2. 使用charles远程调试iOS移动应用

    做iOS移动应用很多开发者会喜欢抓网络发包.回包来联调服务端借口以及定位其他网络问 题.如果在Windows系统可以使用fiddler来做iOS的远程代理,只要fiddler所在系统与iOS设备同时连 ...

  3. Android Touch事件传递机制详解 上

    最近总是遇到关于Android Touch事件的问题,如:滑动冲突的问题,以前也花时间学习过Android Touch事件的传递机制,可以每次用起来的时候总是忘记了,索性自己总结一下写篇文章避免以后忘 ...

  4. 【java】StringBuilder的三种清除方法对比

    参考链接:https://blog.csdn.net/roserose0002/article/details/6972391

  5. opencv-2.4.11编译备忘

    编译完成后,想测试example中例子,但是由于没有sudo权限,不能运行pkg-config查看opencv的--cflags和--libs. 记录一下,备忘: pkg-config --libs ...

  6. node.js之http-server

    我们有时候会遇到这种情况,一个html文件在本地打开时,测试平常的功能还行,但是,一涉及到ajax请求,就算你是请求本地的json文件,他都会涉及到跨域的问题,浏览器本身就限制了本地打开时,不允许跨域 ...

  7. android 仿ios开关控件

    ios一些控件还是挺美丽的,可是对android程序猿来说可能比較苦逼,由于ios一些看起来简单的效果对android来说可能就没那么简单了,可是没办法非常多产品都是拿ios的一些控件叫android ...

  8. jquery代码小片段

    1. 使用jQuery来切换样式表 //找出你希望切换的媒体类型(media-type),然后把href设置成新的样式表. $(‘link[media="screen"]‘).at ...

  9. Linux trace使用入门

    概念 trace 顾名思义追踪信息,可通俗理解为一种高级打印机制,用于debug,实现追踪kernel中函数事件的框架.源代码位于:\kernel\trace\trace.c,有兴趣能够研究 撰写不易 ...

  10. eclipse--windowBuilder

    https://www.eclipse.org/windowbuilder/ https://www.eclipse.org/windowbuilder/download.php Documentat ...