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Pinterest coding / dsa practice is one slice of a 50-prompt set. Restate the input, name a brute-force baseline, then improve it. Say time and space before you claim you are done. Define a positive interaction that is not a click. Saves and completions tell a different story.
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Coding / DSA
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How to approach. Repeat the input and output in your own words, then give the naive cost. Only then reach for a better structure for pin impression ids.
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How to approach. Write the invariant on the side before the loop. Pinterest rounds go better when the interviewer can see what stays true.
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How to approach. Dry-run three cases: empty, one element, and the boundary you are afraid of. Talk while you do it.
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How to approach. Name the search or traversal and the reason. If you switch approaches, say what the first one failed to handle.
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How to approach. If new data arrives while you iterate, say whether you snapshot or follow updates. Pick one and stick to it.
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How to approach. For a running aggregate, say the window, the update cost, and what you evict. A diagram of two structures is enough.
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How to approach. Explain the key you hash and what a collision means for this data. Do not jump to library names.
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How to approach. Start greedy, then show one input where greedy is wrong if it is wrong. That correction is the answer.
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How to approach. Narrate the low and high bounds before the first iteration. Off-by-one is the usual miss on rotated data.
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How to approach. Define the identity you rate-limit, the clock, and the response when the budget is spent. Test the exact boundary.
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