describe

A website domain like “discuss.leetcode.com” consists of various subdomains. At the top level, we have “com”, at the next level, we have “leetcode.com”, and at the lowest level, “discuss.leetcode.com”. When we visit a domain like “discuss.leetcode.com”, we will also visit the parent domains “leetcode.com” and “com” implicitly.

Now, call a “count-paired domain” to be a count (representing the number of visits this domain received), followed by a space, followed by the address. An example of a count-paired domain might be “9001 discuss.leetcode.com”.

We are given a list cpdomains of count-paired domains. We would like a list of count-paired domains, (in the same format as the input, and in any order), that explicitly counts the number of visits to each subdomain.

Example 1:

Input: 
["9001 discuss.leetcode.com"]
Output: 
["9001 discuss.leetcode.com", "9001 leetcode.com", "9001 com"]
Explanation: 
We only have one website domain: "discuss.leetcode.com". As discussed above, the subdomain "leetcode.com" and "com" will also be visited. So they will all be visited 9001 times.	
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Example 2:

Input: 
["900 google.mail.com", "50 yahoo.com", "1 intel.mail.com", "5 wiki.org"]
Output: 
["901 mail.com","50 yahoo.com","900 google.mail.com","5 wiki.org","5 org","1 intel.mail.com","951 com"]
Explanation: 
We will visit "google.mail.com" 900 times, "yahoo.com" 50 times, "intel.mail.com" once and "wiki.org" 5 times. For the subdomains, we will visit "mail.com" 900 + 1 = 901 times, "com" 900 + 50 + 1 = 951 times, and "org" 5 times.
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Note:

The length of cpdomains will not exceed 100. The length of each domain name will not exceed 100. Each address will have either 1 or 2 "." characters. The input count in any count-paired domain will not exceed 10000. The answer output can be  returned in any order.Copy the code

parsing

We can count all domain names in cpDomains and their superior domain names. We just need to traverse each domain name in cpDomains and count their superior domain names. We can return the list of string generated by combining the last domain name and the corresponding number of occurrence.

answer

class Solution(object):
    def subdomainVisits(self, cpdomains):
        """
        :type cpdomains: List[str]
        :rtype: List[str]
        """
        d = collections.defaultdict(int)
        for domin in cpdomains:
            tmp = domin.split(' ')
            count = int(tmp[0])
            subDomin = tmp[1]
            d[subDomin] += count
            while '.' in subDomin:
                subDomin = subDomin[subDomin.index('.', ) + 1:]
                d[subDomin] += count
        return [str(value) + " " + key for key, value in d.items()]
        
        	      
		
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The results

Given in the Python online submission. Memory Usage: 10000 ms Submissions in Python online submissions for Subdomain Visit Count.Copy the code

Original link: leetcode.com/problems/su…

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