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Quick facts

• Difficulty: MEDIUM
• Problem: Sum of Two Integers
• Topics: Math, Bit Manipulation

Problem gist

The 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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Quick facts

• Difficulty: MEDIUM
• Problem: Remove K Digits
• Topics: String, Stack, Greedy, Monotonic Stack

Problem gist

The 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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Quick facts

• Difficulty: MEDIUM
• Problem: Custom LeetCode-style prompt: Two-Color Necklace Splitting
• Topics: Array, Sliding Window, Prefix Sum, Greedy, Math

Problem gist

This 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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What happened

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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A rocky planet that should have lost its air

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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What happened

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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US and French nationals test positive for hantavirus after leaving ship (r/news)

• careful__now__: Gosh these last 20 years have been so exhausting
• PuertoricanDude88: Patient zero getting a sudden urge to travel around the world.
• browsk: Lol we can’t even learn from an event from the same decade

Teen dies hours after his parents reunited with him following immigration detention (r/news)

• TabascohFiascoh: Christ, dying of colon cancer at 18 is tragic as fuck.
• Lalocal4life: No one with stable mental health wants to see a family with a child like that die under those conditions due to “paperwork”.
• darkultima: I been following this on telemundo for a couple days now. It’s so fucking sad

Netanyahu announced intention to phase out US military aid (r/worldnews)

• vini_2003: Nobody read the damn article here. They’re still going to be partners to the US, but their aim is to integrate at a deeper level in the defense and intelligence sectors and stop “just” receiving aid for the sake of aid.
• Feisty_System_4751: It’s like me announcing I will start a diet on Monday.
• hamstringstring: I assume this means we can stop paying taxes to Egypt as well?

What’s a ‘middle class success’ purchase that secretly becomes a financial burden later? (r/AskReddit)

• sitewolf: ‘Oh honey, let’s buy a camper’ (that you end up using twice a year after the excitement of the first one)
• Successful-Fan2742: Upsizing to a bigger house and then realizing you’ve also upsized taxes, maintenance, and stress
• thanhngx153: Huge houses. People think about the mortgage, but forget furniture, maintenance, repairs, insurance and property taxes never stop

TIL: In 1998, elementary students in Aurora, Colorado started buying slaves in Sudan to free them, this gained global attention with schools in other countries starting slave buyback programs until it became clear that the money was just helping slavery grow (r/todayilearned)

• Randvek: Cobra farm vibes here.
• AxelNotRose: Infinite money loop for the slavers.
• Stuck_in_my_TV: Giving money to someone perpetrating an atrocity will only perpetuate more atrocities as you have increased the incentives for them to keep committing heinous actions in the hopes of future payouts.

Why does the expected % for tipping keep increasing? (r/NoStupidQuestions)

• someguy2355: Yeah it’s dumb. Percent already scales, that’s literally the point.
• RangerDickard: The boss doesn’t have to pay wages if you do it for him. That’s why
• dogsn1: They’re trying to milk more money out of you

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Top AI Startups Which Are Not OpenAI/Anthropic (Blind)

• Bibimbump (Glean): Glean
• SissyCo (Cisco): Poolside and Zyphra
• kkrimtim (NVIDIA): Thinking machines

Best date to join Uber (Blind)

• chimarki (Meta): Best date is never
• hacker201 (Booking.com): what is your YOE and level ?
• andyKiMaKi (Rippling): What’s your level?

Students Boo Commencement Speaker After She Calls AI the ‘Next Industrial Revolution’ (r/technology)

• boyyouvedoneitnow: Private Equity VP as a commencement speaker SUCKS
• Badj83: “and you… You are the horses!”
• QuailBrave49: Honestly, let’s stop glamorizing AI.

Reddit Starts Blocking Mobile Website, Pushing Users to App Instead (r/technology)

• thenexus6: Desktop only for me then, which means I’ll be on here even less.
• Negafox: Not interested in websites trying to force their app. I don’t need a zillion apps on my phone that are just the mobile site running in Chromium
• AwfulUsername123: Old Reddit remains the proper way to browse Reddit.

Mass npm Supply Chain Attack Hits TanStack, Mistral AI, and 170+ Packages (r/programming)

• cauchy37: One would think that after all those supply chain attacks most big companies would use private artifactory that’s like a month or two behind, to prevent exactly this.
• vips7L: Saved again by being a Luddite and not using vscode or Claude. 
• Maybe-monad: Always pin your packages

Is the push for AI burning anyone else out? (r/cscareerquestions)

• Melodic-Ebb-7781: I mainly feel squeezed. On one hand we’re supposed to quickly start writing all code with LLMs and hit new ambitious targets but on the other corporate are cheaping out on tokens, and tools (we don’t even have claude code only copilot) and IT refuses data connectors to be setup between different internal knowledge bases. Instead we’re getting endless workshops with external consultants who mostly seem clueless.
• klibs: Yes it sucks
• maxou2727: You just have dumb management, jump ship before they start realizing their mistakes and layoff people.

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What happened

Google DeepMind’s official blog published AlphaEvolve: How our Gemini-powered coding agent is scaling impact across fields, a May 7, 2026 post about moving AlphaEvolve from an algorithm-discovery research system into a practical optimization tool used across science, AI infrastructure, and commercial engineering.

The post is interesting because AlphaEvolve is not framed as a general assistant that writes plausible code. It is framed as an optimizer wrapped around executable artifacts. The underlying system combines Gemini models with automated evaluators and an evolutionary loop: models propose code changes, evaluators run and score the candidates, strong variants are retained, and the program database feeds future prompts. That architecture matters because it gives the agent a tight feedback signal. The model can be creative, but progress is selected by objective tests rather than by conversational confidence.