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Quick facts

• Difficulty: MEDIUM
• Problem: Maximum Width of Binary Tree
• Topics: Tree, Depth-First Search, Breadth-First Search, Binary Tree

Problem gist

The input is the root of a binary tree. The task is to find the largest width across all levels.

The subtle part is how width is defined. It is not just the number of real nodes on a level. The width runs from the leftmost real node to the rightmost real node on that level, counting the missing null positions between them as if the tree were laid out like a complete binary tree.

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Seeing Mines with Particles from Space

Adam Bluestein’s article turns a mining story into a physics story. The pressure begins with copper and other critical minerals, whose demand is rising as grids, electric vehicles, batteries and other clean-energy systems scale up. Existing mines are being asked to produce more, even as their ore gets poorer and new discoveries take many years to become working operations. The result is a basic problem of vision: mining companies need to know much more about what is underground before they dig, blast or send workers into unstable spaces.

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This summary covers The Economist’s April 25th, 2026 Science & technology item listed in the contents as Well Informed: Bone broth's benefits and published under the headline Is bone broth good for you?.

The article treats bone broth as a useful case study in wellness marketing. The drink has become fashionable because it sounds both ancient and scientific: simmer bones and connective tissue for long enough, and the result contains protein, collagen, amino acids and other compounds associated with the body. That makes it easy to sell as a shortcut to weight loss, better skin, stronger bones, joint health and gut repair.

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The Pragmatic Engineer surfaced this May 20, 2026 article, and the original post is Google Cloud deletes Australian trading fund’s infra.

A backup outside the blast radius

The story is alarming because the failure was not a familiar cloud outage. It was not a data center burning down, a region going dark, or a bad deploy taking one product offline. According to The Pragmatic Engineer’s recap, Google Cloud accidentally deleted UniSuper’s cloud subscription, and that administrative mistake removed the data associated with it. UniSuper had replicated across two Google Cloud regions, but the replica lived inside the same provider-level blast radius, so it disappeared too.

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Tulsi Gabbard resigns as Director of National Intelligence (r/news)

• Stock-Pattern-8635: I wonder if that whistleblower report shes been trying to block will come out soon now
• WatchmanVimes: “Whelp my job is done here! I have removed all intelligence!”
• Alt_Restorer: How many women do we have left now?

All charges against Chicago protesters dropped in latest ICE case to unravel | Chicago (r/news)

• BrofessorFarnsworth: Start disbarring the prosecutors. This shit needs consequences.
• Neilpuck: Meanwhile, how much have those protesters had to spend on legal fees etc, and how many have lost their jobs?
• AugustOfChaos: Every single person who was falsely arrested should sue the living shit out of ICE and the government.

Ukraine liberated 590 square kilometers of territory this year, ‘forcing Russia toward diplomacy,’ Zelensky says (r/worldnews)

• brainrotxx: putin gonna say “Ukraine is invading russia!! pls stop them!!”
• Morgandoto: Putin still wants to fight to the last russian. He will throw a mass mobilization soon, and when every mobilized soldier dies, he will use a nuke.
• buttplugpeddler: This man is everything I wish my president was.

Bank boss sorry after describing workers as ’lower value human capital’ (r/worldnews)

• WasteBinStuff: “I’m truly sorry ^that ^I ^got ^caught ^saying ^it.”
• CrackerBarrelGrandma: This is what many business elites think
• AloneChapter: Sorry he was caught . Not sorry about the disrespect though

What’s something attractive at 18 but embarrassing at 30? (r/AskReddit)

• KellyAnn3106: Talking about your high school accomplishments.
• FunctionAfter6683: 18 year olds
• mtconnol: Being a high school senior

TIL physicist Karl Schwarzschild solved Einstein’s field equations while dying of disease on the WWI Eastern Front. His solution predicted black holes. He wrote to Einstein: “the war treated me kindly enough to allow me to take this walk in the land of your ideas.” He died months later. (r/todayilearned)

• ArgentineBeauty: The quote absolutely broke me. Imagine being that close to death and still finding wonder in someone else’s ideas. This is why I love history.
• FlammenwerferIV: Heartbreaking that such a brilliant mind had to fight a war
• keajohns: Physicist and poet

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Meta execs can opt out of AI surveillance. Everyone else can’t. (Blind)

• MedusaJ (Microsoft): Cancer eating itself
• AWildWorld (Apple): No leadership does not care about employee petitions
• MSatyta (Microsoft): Time to unionize MetaMates or just keep having layoffs

Meta pulled Thanos on Managers (Blind)

• Reqarded (Robinhood): Good, managers are useless
• rkigxvwkfi (Netflix): No more human bloat, thats good
• chitumbigu (Snap): So if they’re not technical they’re cooked? Lmao

Microsoft reports are exposing AI’s real cost problem: Using the tech is more expensive than paying human employees (r/technology)

• sunnyshorescreative: Which probably explains the layoffs in these companies investing heavily into using AI
• Shiningc00: In the end these are all LLMs where they’ve hyped it into thinking we’ll get AGIs.
• NoScallion2856: Imagine firing thousands of actual people just to end up losing money on a chatbot.

Reddit stock drops 6% after Meta launches standalone app for online forums / Reddit’s stock is now down almost 40% this year despite a strengthening online ad business (r/technology)

• polkadanceparty: lol. I can’t wait for every facebook person to stay on facebook and leave reddit
• lockwolf: Ahh, the Reddit killer from Meta. Like Threads was supposed to be the Twitter killer from Meta
• darw1nf1sh: Reddit’s downfall isn’t directly related to a FB app. It is related to their own mismanagement.

Starbucks scraps AI inventory tool after nine months (r/technology)

• surfnfish1972: The worst part of all this, AI does not even fookin work!
• NoScallion2856: Imagine spending billions on AI just to lose a fight against a bottle of milk.
• vortexmak: What are you talking about,  it correctly identified “Not a hotdog”

If you use the “Get Shit Done” (GSD) AI tool, you need to migrate immediately (Original creator rug-pulled) (r/ClaudeAI)

• martin1744: gsd: get shit deleted
• Firm_Meeting6350: thanks for sharing, seriously!
• terraslate: he definitely got shit done.

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What happened

Microsoft’s official Security Blog published Introducing RAMPART and Clarity: Open source tools to bring safety into Agent development workflow, a May 20, 2026 post about turning agent safety from an occasional review into a set of engineering artifacts that can live in a repository, run in CI, and evolve with the system.

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A Provocation from Inside Physics

Lee Billings’s interview with Gerard ’t Hooft turns a deceptively simple complaint into a broad argument about the future of fundamental physics. ’t Hooft is not an outsider taking shots at quantum mechanics. He is a Nobel-winning theorist whose work helped make the Standard Model mathematically coherent and who later proposed the holographic principle, one of the ideas that shaped modern quantum-gravity research. That background makes his impatience with quantum mystery harder to dismiss.

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Techmeme surfaced this May 22, 2026 story in its green-card process cluster. The direct source used here is USCIS’s May 22 announcement, U.S. Citizenship and Immigration Services Will Grant “Adjustment of Status” Only in Extraordinary Circumstances.

Immigration policy as technical infrastructure

USCIS says it has issued a new policy memo directing officers to treat adjustment of status as an extraordinary form of relief. In plain terms, the agency is saying that many people who are in the United States temporarily and want a green card should pursue consular processing through the Department of State outside the country instead of shifting to permanent-residence processing from inside the United States.

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The article argues that American corporate profits have become the strongest rebuttal to the gloom around the United States. Investors have spent weeks trying to price war in the Gulf, tariffs, erratic presidential threats and fears about American decline. Yet the earnings data tell a different story: big American companies are still producing striking profit growth, and Wall Street is treating that strength as more important than the political noise.