Daily Temperatures
Given an array of daily temperatures Return an array where answer[i] is the number of days to wait for a warmer temperature If there's no future warmer day, answer[i] = 0 Example: [73,74,75,71,69,72,76,73] => [1,1,4,2,1,1,0,0]
This is a stack/invariant problem: once your stack represents the right thing, the rest is routine. Interviewers love it because it reveals your stack invariants and your edge-case discipline. Most solutions fail when the stack meaning gets fuzzy—name it and guard it.
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