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Quick facts

• Difficulty: MEDIUM
• Problem: The Earliest Moment When Everyone Become Friends
• Main tags: Array, Union-Find, Sorting

What the problem is really asking

There are n people labeled from 0 to n - 1. The input is a list of friendship events. Each event has a timestamp and two people, meaning those two people become direct friends at that moment.

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Quick facts

• Difficulty: MEDIUM
• Problem: Course Schedule II
• Main tags: Depth-First Search, Breadth-First Search, Graph Theory, Topological Sort

What the problem is really asking

There are numCourses courses labeled from 0 to numCourses - 1.

Each prerequisite pair [course, prerequisite] means the prerequisite must be taken before the course. The task is to return any valid order that takes every course, or return an empty list when no such order exists.

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Quick facts

• Difficulty: MEDIUM
• Problem: Next Greater Element II
• Main tags: Array, Stack, Monotonic Stack

What the problem is really asking

The input is an integer array nums, but the array is circular. After the last index, the scan wraps back to index 0.

For each index i, the task is to find the first value that is strictly greater than nums[i] when walking forward through this circular array. If no greater value appears before returning to i, the answer for that index is -1.

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Difficulty: MEDIUM
Problem: Swap Adjacent in LR String

Problem gist

The string contains three characters: L, R, and X. Think of X as an empty space. The only allowed moves are:

1. XL -> LX, which moves an L one position to the left.
2. RX -> XR, which moves an R one position to the right.

Given start and end, the task is to decide whether start can become end after any number of those moves.

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What happened

OpenAI’s official engineering blog published Supercomputer networking to accelerate large scale AI training, a post about Multipath Reliable Connection, or MRC, a network protocol and deployment architecture for keeping large synchronous GPU training jobs moving through congestion, link failures, switch failures, and maintenance events.

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Why heat conduction matters

This article turns a materials-science result into a broader question about what physicists think the limits of matter are. Copper has long been the default metal for moving heat away from hot components. Its usefulness is not glamorous, but it is central to modern technology: electronics, power equipment, data centers and industrial systems all depend on getting heat out before performance drops or hardware fails.

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What happened

Techmeme surfaced this May 7, 2026 story in its Techmeme item, and the original article is The Verge’s ChatGPT’s ‘Trusted Contact’ will alert loved ones of safety concerns. OpenAI’s related posts on community safety and mental health-related work provide useful context for why the feature is arriving now.

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This summary covers The Economist’s April 25th, 2026 Business article listed in the contents as Chatbot ads and published under the headline The salesman in the machine.

The article argues that artificial-intelligence chatbots are becoming a new advertising medium, not just a new software interface. As more people use large language models for search, writing, coding, shopping and personal advice, the companies running those models are starting to insert sponsored messages into the conversation. That shift matters because it could reshape both the economics of AI and the structure of digital advertising.

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FedEx driver sentenced to death by lethal injection for murder of seven-year-old in Texas (r/news)

• Bowllieo: I’m sure the company loves him being referred to in that way.
• spazzxxcc12: it’s really hard for me to want to keep my stance on the death penalty when it comes to cases like this.
• Puzzleheaded_Bed1781: I don’t get it. What drives someone to WANT to murder a child???

EU Parliament votes in favour of banning conversion therapy across member states (r/worldnews)

• Frozen_Thorn: Another EU win. Keep fighting the good fight.
• mental_monkey: Good! Heinous stuff like that needs to be banned.
• Striking-Donut8491: I used to pray for times like this

Hotels in U.S. World Cup host cities claim underwhelming demand, new report says (r/sports)

• pelethar: Good. Fuck FIFA
• CanadianGuy39: God this warms my heart so much.
• Cyphermaniax97: Gee, I wonder why. /s

What actor is nowhere near as talented as people make them out to be? (r/AskReddit)

• patawpha: Paul Rudd is just Paul Rudd which is fine because at the end of the day I like Paul Rudd.
• Puzzleheaded-Can8586: I wish somebody believed in me the way Hollywood seems to believe in Jared Leto.
• mandelbratwurst: Kevin Costner has exactly one emotion and its “stoic”

TIL there were 180.000 bees kept in the spires of Notre Dame and they survived the fire. Because bees don’t have lungs they weren’t hurt by the smoke, they just fell asleep (r/todayilearned)

• Leomuck: Bees do not have lungs? Wow, I’ve definitely learned something today. They breathe, but not through lungs.
• JeepWrangler319: You know Quasimodo predicted all this
• n_mcrae_1982: Maybe Quasimodo wasn’t really a hunchback. Maybe he was just really, really allergic to bee stings.

David Letterman Calls CBS Owners “Lying Weasels” After ‘Late Show With Stephen Colbert’ Cancellation (r/television)

• vibe4it: tbf, he’s called them lying weasels all along
• steelbeamsdankmemes: Don’t blame Stephen.
• witherspoon90: Another end of an era for late night

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Amazon Shakes Up Hiring With Agentic AI Recruiting Agents (Blind)

• uYMW15 (Workday): AI agent will take interviews of AI agents LOL
• Indble (Amazon): I will be sending my Ai representation to interview on my behalf. “Talk to a representative”. I’ve done two virtual interviews and they were awful.
• sensei (Google): AI generated post to warn about AI generated hiring decisions.

Coinbase lays off 14% (Blind)

• oasis2025 (Microsoft): isn’t this the same CEO who said every new hire needs to be approved by him and should have an extraordinary talent like medals and shit?
• trsaz (Amazon): Another day, another struggling company using AI as an excuse for layoffs. Meh…
• TBjy63 (Amazon): Coinbase should be a money printer. Why do they need to lay people off?

Mark Zuckerberg ‘Personally Authorized and Actively Encouraged’ Meta’s Massive Copyright Infringement to Train AI Systems, Publishers and Scott Turow Allege in Lawsuit (r/technology)

• Aromatic-Web8184: I can’t help but be reminded of the early 2000’s where people’s lives were being destroyed because they downloaded some music off the internet. Then there’s this asshole.
• One_Weird2371: All these AI companies should be sued for massive copyright infringement…
• IntelArtiGen: I’m sure he’s ok with bearing all the responsibility because he knows he risks nothing.

A Security Researcher Decompiled The White House App, & What They Found Is Pretty Alarming (r/technology)

• mohawk990: The most transparent administration in the history of the US.
• TripleSingleHOF: Why would there ever need to be a “White House app”?
• namastayhom33: It’s like this whole administration was vibe-coded

Roku and TCL Accused of Bricking Smart TVs Through Software Updates (r/technology)

• wowlock_taylan: ‘smart’ Tvs are the biggest lie.
• errantekarmico: I had the same problem. Does anyone know how one can join this lawsuit?
• No-Introduction1495: This has been happening with all tech for several years now sadly

GPT-5.5 Instant is starting to roll out in ChatGPT. (r/OpenAI)

• slumberjak: Any chance this will affect the model we interact with in advanced voice mode? Bless her heart, she’s dumb as a box of rocks.
• maybefuckinglater: Is it going to argue with me about everything I say
• Gerstlauer: The 5.5 series are by far the best model OpenAI have put out in almost a year. I hope they keep moving in this direction

Looking for feedback on AI content in r/programming and the April no-AI trial (r/programming)

• PracticeAccording274: the april trial felt pretty good tbh, less noise in the feed and more actual programming discussions instead of endless “will ai replace us” posts
• davenirline: Oh Please keep it. I think it’s the only one sub that I go to that does this.
• Computer991: It was amazing, please keep it