This question runs in a pre-configured Salesforce environment - no personal connection required.
Given an integer topN, find the account names that have the most associated contacts. Use an aggregate SOQL query on the Contact object, grouped by Account Name, ordered by contact count in descending order, and limited to topN results. Return a list of account names ordered from most contacts to fewest. Return an empty list for null or non-positive input.
Only include contacts that have a non-null AccountId in the grouping.
Method signature: public static List<String> accountsWithMostContacts(Integer topN)
Examples:
Input: topN = 3
Output: ['Acme Corp', 'Global Industries', 'TechStart Inc']
Explanation: These three accounts have the most contacts in descending order
Input: topN = 1
Output: ['Acme Corp']
Explanation: Returns only the account with the most contacts
Input: topN = 0
Output: []
Input: topN = null
Output: []
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