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HARDSerialization, Depth-First Search, Hash Table, Graph, DesignThe task is to write an encoder that accepts an input value and returns the same kind of string a normal JSON serializer would return:
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MEDIUMMath, Bit ManipulationThe task is to return the sum of two signed integers without using the + or - operators. The important constraint is not about math knowledge; it is about understanding how binary addition works under the hood.
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MEDIUMString, Stack, Greedy, Monotonic StackThe problem gives a non-negative integer as a string and asks for the smallest possible number after removing exactly k digits. The answer must not keep unnecessary leading zeroes, and if every digit is removed or the remaining digits are all zeroes, the answer is "0".
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MEDIUMArray, Sliding Window, Prefix Sum, Greedy, MathThis is a special case of the necklace splitting problem: two people, two bead
types, and therefore at most two cuts. The input is a necklace represented as an
array containing only X and Y. Suppose the full array has:
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Microsoft’s official Security Blog published Defense at AI speed: Microsoft’s new multi-model agentic security system tops leading industry benchmark, a post about MDASH, Microsoft’s multi-model agentic scanning harness for vulnerability discovery and validation.
The post is interesting because it treats AI-assisted security review as a production engineering system rather than a smarter static analyzer. MDASH is not framed as one frontier model pointed at a repository. It is a pipeline that prepares a target codebase, builds indices, maps attack surfaces, runs specialized auditor agents over candidate paths, sends findings through adversarial validation, deduplicates semantically similar reports, and then tries to prove that a vulnerability can actually be triggered.
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The article centers on TOI-561 b, a rocky exoplanet that appears to violate a basic expectation about atmospheres. Small, hot worlds should have trouble holding on to gas. Heat gives atmospheric molecules more energy, a planet’s low gravity makes escape easier, and intense radiation from a nearby star can strip air away over time. TOI-561 b seems to face all of those problems at once.
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Techmeme surfaced this May 13, 2026 story in its Techmeme cluster, and the original post is Meta’s Introducing a Completely Private Way to Chat With AI. WhatsApp also published its own companion post, Introducing Incognito Chat with Meta AI.
Meta is rolling out Incognito Chat for Meta AI on WhatsApp and in the Meta AI app. The promise is straightforward: people can ask AI sensitive questions without the conversation being visible to Meta or retained as a normal chatbot log. Meta says the feature runs on WhatsApp’s Private Processing infrastructure, processes messages in a secure environment, does not save the conversation, and makes chats disappear by default.
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This summary covers The Economist’s April 25th, 2026 Science & technology article listed in the contents as Chernobyl, 40 years on and published under the headline A laboratory like no other.
The article argues that Chernobyl is no longer only a synonym for nuclear catastrophe. Forty years after reactor number four exploded, the site has become an unmatched field laboratory for understanding how radiation moves through water, soil, food, microbes, animals and human institutions. The disaster was real, deadly and politically consequential. Yet its long afterlife has produced a large body of practical knowledge about what nuclear accidents do, what they do not do, and how societies should respond when fear outruns evidence.
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