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Merge overlapping intervals, and explain the sort-then-sweep pattern.

Interval merging is a classic that tests the sort-then-sweep insight. The signal is sorting by start, then merging in one pass, O(n log n). Here is the pattern and the family of problems it unlocks.

Updated Aug 2026 · Grounded in real Applied AI Engineer interview loops and written to a senior-engineer editorial bar.

Interval merging is a classic that tests the sort-then-sweep insight. The signal is sorting by start, then merging in one pass, O(n log n). Here is the pattern and the family of problems it unlocks.

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Next in this trackImplement k-nearest-neighbors classification from scratch, and make prediction efficient.Next in this trackImplement a 2D convolution (the forward pass) from scratch.Next in this trackImplement Layer Normalization (and RMSNorm) from scratch.

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