Subdomain Visit Count LeetCode Solution

Problem – Subdomain Visit Count

A website domain "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.

A count-paired domain is a domain that has one of the two formats "rep d1.d2.d3" or "rep d1.d2" where rep is the number of visits to the domain and d1.d2.d3 is the domain itself.

• For example, "9001 discuss.leetcode.com" is a count-paired domain that indicates that discuss.leetcode.com was visited 9001 times.

Given an array of count-paired domains cpdomains, return an array of the count-paired domains of each subdomain in the input. You may return the answer in any order.

Example 1:

Input: cpdomains = ["9001 discuss.leetcode.com"]
Output: ["9001 leetcode.com","9001 discuss.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.

Example 2:

Input: cpdomains = ["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.

Constraints:

• 1 <= cpdomain.length <= 100
• 1 <= cpdomain[i].length <= 100
• cpdomain[i] follows either the "repi d1i.d2i.d3i" format or the "repi d1i.d2i" format.
• repi is an integer in the range [1, 104].
• d1i, d2i, and d3i consist of lowercase English letters.

Subdomain Visit Count LeetCode Solution in C++

    vector<string> subdomainVisits(vector<string>& cpdomains) {
        unordered_map<string, int> count;
        for (auto cd : cpdomains) {
            int i = cd.find(" ");
            int n = stoi(cd.substr (0, i));
            string s = cd.substr (i + 1);
            for (int i = 0; i < s.size(); ++i)
                if (s[i] == '.')
                    count[s.substr(i + 1)] += n;
            count[s] += n;
        }
        vector<string> res;
        for (auto k : count)
            res.push_back (to_string(k.second) + " " + k.first);
        return res;
    }

Subdomain Visit Count LeetCode Solution in Java

    public List<String> subdomainVisits(String[] cpdomains) {
        Map<String, Integer> count = new HashMap();
        for (String cd : cpdomains) {
            int i = cd.indexOf(' ');
            int n = Integer.valueOf(cd.substring(0, i));
            String s = cd.substring(i + 1);
            for (i = 0; i < s.length(); ++i) {
                if (s.charAt(i) == '.') {
                    String d = s.substring(i + 1);
                    count.put(d, count.getOrDefault(d, 0) + n);
                }
            }
            count.put(s, count.getOrDefault(s, 0) + n);
        }

        List<String> res = new ArrayList();
        for (String d : count.keySet()) res.add(count.get(d) + " " + d);
        return res;
    }

Subdomain Visit Count LeetCode Solution in Python

    def subdomainVisits(self, cpdomains):
        count = collections.Counter()
        for cd in cpdomains:
            n, s = cd.split()
            count[s] += int(n)
            for i in range(len(s)):
                if s[i] == '.':
                    count[s[i + 1:]] += int(n)
        return ["%d %s" % (count[k], k) for k in count]

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