Median of Two Sorted Arrays in O(log(m+n)).

This notoriously hard problem demands better than the O(m+n) merge: an O(log) binary search on the partition. Interviewers look for binary-searching the split point so the left halves stay below the right halves. The answer follows.

Updated Sep 2026 · Grounded in real GenAI, LLM, and AI/ML engineering interview loops and written to a senior-engineer editorial bar.