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MEDIUMTree, Breadth-First Search, Binary TreeThe task is to read a binary tree one layer at a time.
Instead of visiting nodes in a depth-first order such as root, left subtree, right subtree, the problem wants the tree grouped by depth:
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This article explains why physicists are excited about a newly recognized class of magnetic materials called altermagnets. The claim is not merely that scientists found one more exotic substance with unusual behavior. It is that they may have uncovered a missing category in the basic taxonomy of magnetism, sitting between the two familiar cases: ferromagnets, whose aligned electron spins create an ordinary magnetic field, and antiferromagnets, whose alternating spins cancel one another out.
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This summary covers The Economist’s April 11th, 2026 Business article listed in the contents as Japan's troubled carmakers and published under the headline Land of the setting sun.
The article argues that Japan’s car industry is in a deeper strategic bind than a normal cyclical slowdown. Honda is headed for its first annual net loss in decades. Nissan is closing factories. Across Asia, Japanese brands are losing share. The immediate pressures include American tariffs and weak profitability, but The Economist’s main point is that the real shock has come from misreading the shift to electric and software-heavy vehicles. A business model built around excellence in mechanical engineering has collided with a market that now rewards battery technology, software capability and much faster product adaptation.
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The Pragmatic Engineer surfaced this April 28, 2026 piece, and the original post is How will AI change operating systems? Part 1: Ubuntu and Linux.
Gergely Orosz uses reporting from Canonical VP of Engineering Jon Seager to ask a more interesting question than which coding model is best this week: what does AI change at the operating-system layer? The article’s answer is that Linux distributions do not need to become chatbots. They need to become better substrates for a world full of AI accelerators, local inference, agentic tooling, and much messier hardware diversity.
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BisquickNinja: Yay… I guess the US is now into money laundering….
Cultural_Meeting_240: nothing says freedom like laundering cartel gold into liberty coins.
cagadadechango: It’s turning bleak just now?
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jjh78z23 (Intel): Nine levels is crazy. Five seems much more reasonable.
krakenrand (Microsoft): The days of growth mindset are over. It’s sink or swim. We had a good run with azure but AI is a beast that 50 year old companies can’t deal with. We will become a cheap token factory and all the economic benefits will go to the application layers where we don’t play. Office is just a presentation layer. We have no models and we survived on enterprise ctos paying for office thos e days are over
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MEDIUMArray, Binary SearchThis problem looks geometric, but the core idea is much simpler than it first appears.
The task is to place a horizontal line y = cut so that:
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Selected problem: Ad Click Aggregation
Scope: Design a high-throughput ad event aggregation pipeline that ingests impression and click events, deduplicates them, produces near-real-time campaign rollups, and supports slower reconciled reporting for analytics, optimization, and billing-adjacent use cases.
This interview problem is less about serving ads and more about turning a firehose of raw events into trustworthy aggregates. Grokking and Alex Xu push the same early habit here: clarify scope, keep the write path simple and durable, and decouple slow downstream consumers with queues or logs. DDIA adds the deeper constraint: aggregated counters are derived data, so correctness depends on event ordering, idempotence, late-event handling, and replay, not on pretending one synchronous write magically updates every store exactly once.
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SuedJche: I am honestly surprised how little opposition he has mounted to his defeat
Apprehensive_Idea758: Good riddance and hopefully more of those far-right governments will start falling as soon as possible.
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centr!st (ex-Atlassian): Sad how Atlassian used to be at the top of these lists and ruined everything in a year with toxic culture shift and shit CTO
喜 (Zoom): Whatever you do never join ZOOM, worst company I ever worked for.
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