While scrolling through LinkedIn, I came across a question about Happy Numbers. I solved it, and it... Tagged with programming, java, payilagam, interview.

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Two classic coding interview problems are solved in Java: Happy Numbers (determining if a number eventually reaches 1 through repeated digit squaring) and Trapping Rainwater (calculating water volume trapped between elevation bars). The Happy Numbers solution uses a HashSet to detect cycles, while the Rainwater solution employs left and right maximum arrays to find trapped water at each position.

Happy Numbers,Trapping of Rainwater