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1236_crawl.java

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/**

* // This is the HtmlParser's API interface.

* // You should not implement it, or speculate about its implementation

* interface HtmlParser {

* public List<String> getUrls(String url) {}

* }

*/

class Solution {

public List<String> crawl(String startUrl, HtmlParser htmlParser) {

List<String> res = new ArrayList<>();

Queue<String> queue = new LinkedList<String>();

queue.add(startUrl);

Set<String> set = new HashSet<>();

set.add(startUrl);

String hostName = getHostName(startUrl);

while(!queue.isEmpty()){

String current = queue.remove();

res.add(current);

List<String> list = htmlParser.getUrls(current);

for(String url: list){

if(!set.contains(url) && getHostName(url).equals(hostName)){

queue.add(url);

set.add(url);

}

}

}

return res;

}

private String getHostName(String url){

return url.split("/")[2];

}

}