Leetcode 811. Subdomain Visit Count

Given entries like "9001 discuss.hellointerview.com", parse each count and domain, generate all parent subdomains (e.g., "hellointerview.com", "com"), and aggregate visit counts for each subdomain. This is a string parsing + hashmap accumulation problem to sum frequencies and output count-paired results.

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Leetcode 811. Subdomain Visit Count

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