The Coding Interview Gym
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Strings and Anagrams Challenge: Group Anagrams
Problem
May 11
•
Paul Epps
1
1
Private Resume and LinkedIn Profile Reviews
Bring it on
May 9
•
Paul Epps
Reader Solutions Reviewed: Subarray Sum
Canonical solution and common mistakes
May 8
•
Paul Epps
1
Prefix Sums: The Hidden Pattern Behind 15 Array Interview Problems
Why do so many array interview questions reduce to the same three lines of math?
May 6
•
Paul Epps
1
Prefix Sum Challenge: Subarray Sum Equals K
Problem
May 4
•
Paul Epps
1
Reader Solutions Reviewed: Sliding Window
Challenge: Longest Substring Without Repeating Characters
May 1
•
Paul Epps
1
April 2026
Sliding Window Masterclass
The Pattern That Solves 20+ Interview Problems
Apr 29
•
Paul Epps
Sliding Window Challenge: Longest Substring Without Repeating Characters
Problem
Apr 27
•
Paul Epps
1
Reader Solutions Reviewed: Two Sum
One-Pass Solutions, Off-by-One Traps, and Hash Collision Edge Cases
Apr 24
•
Paul Epps
1
Two Sum: From O(n²) Brute to O(n) Hash Map
And when interviewers want both
Apr 22
•
Paul Epps
1
Arrays and Two Pointers Challenge: Two Sum
Find the pair
Apr 20
•
Paul Epps
1
Review and Feedback: Coin Change and Dynamic Programming
Recursion → memoization → tabulation
Apr 16
•
Paul Epps
1
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