A classic that rewards the two-pointer insight over brute force. The signal is realizing water at each position is bounded by the min of the max walls on each side, then computing it in one pass. Here is the answer.
Updated Aug 2026 · Grounded in real Applied AI Engineer interview loops and written to a senior-engineer editorial bar.
A classic that rewards the two-pointer insight over brute force. The signal is realizing water at each position is bounded by the min of the max walls on each side, then computing it in one pass. Here is the answer.
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