athenahealth LeetCode interview questions

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Problem	Difficulty	Frequency	Acceptance
The Number of Rich Customers Database EASY	Easy	100.0%	0.8%
Longest Substring Without Repeating Characters Hash Table String Sliding Window MEDIUM	Medium	84.2%	0.4%
Longest Palindromic Substring Two Pointers String Dynamic Programming +1 MEDIUM	Medium	77.6%	0.4%
Group Anagrams Array Hash Table String +1 MEDIUM	Medium	68.3%	0.7%
Merge Intervals Array Sorting Quicksort MEDIUM	Medium	68.3%	0.5%

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