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Quick facts

• Difficulty: MEDIUM
• Problem: Find And Replace in String
• Topics: Array, Hash Table, String, Sorting

Problem gist

The input is a base string s and three parallel arrays:

• indices[i] says where a possible replacement starts.
• sources[i] says what text must already appear there.
• targets[i] says what text to write if the source matches.

Every replacement is checked against the original string, not against a partially edited string. That “simultaneous” detail is the core of the problem. If s = "abcd", indices = [0, 2], sources = ["a", "cd"], and targets = ["eee", "ffff"], both checks happen on "abcd", so the answer is "eeebffff".

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Artemis II was designed as a test flight, but Nadia Drake frames it as something larger: the moment human spaceflight returned to the moon after more than half a century. The mission did not land. Instead, commander Reid Wiseman, pilot Victor Glover, mission specialist Christina Koch and Canadian mission specialist Jeremy Hansen rode NASA’s Orion spacecraft on a looping 10-day path around the moon, proving out the systems that are supposed to support later lunar landings and, eventually, a sustained human presence near the lunar south pole.

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This summary covers The Economist’s May 9th, 2026 Finance & economics article on artificial intelligence and China’s office-property market, published under the headline The rent is too damn AI and listed in the contents as AI rescues Chinese landlords.

The article uses a neat irony to explain a real-estate rebound. A court in Hangzhou, one of China’s leading AI hubs, ruled that firms cannot simply dismiss workers and replace them with artificial intelligence. That is good news for employees. It is also good news for commercial landlords, because office towers do not earn rent from software agents. They need people in seats, and China’s newest source of people in seats is the AI boom.

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The Pragmatic Engineer surfaced this May 27, 2026 podcast episode, and the original episode page is Building OpenCode with Dax Raad.

Open source becomes the product wedge

The episode is interesting because OpenCode is not framed as another AI coding tool trying to win by having slightly better prompts or a slicker interface. Dax Raad’s account is more strategic: OpenCode saw that no one had clearly claimed the open-source AI coding harness category, then moved hard into that position. In a market crowded with proprietary agents, wrappers, IDEs, and model-specific workflows, that positioning gave developers a simple reason to care.

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Several killed as train and school bus collide in Belgium, local media report (r/news)

• Smintjes: The lights were red and the barriers were closed, still the bus was on the tracks. A lot of unknowns for the moment.
• Melazie_: That’s fucking horrible, how does that even happen?
• _thewildwest: This is absolutely horrific and devastating. The children on the bus were students attending a special needs school….oh my god. My heart goes out to the victims and their families

US strikes were ‘gross violation’ of ceasefire, Iran says (r/news)

• random_agency: So were the other 2 sneak attack by the US during negotiation.
• gitrjoda: I’m no expert, but I would think one of the foundations of a ceasefire is to cease firing.
• CPOx: Yes. I would assume that the act of firing violates a ceasefire.

Ireland to ban goods from Israeli settlements in West Bank by July (r/worldnews)

• gunzgoboom: I wonder what kind of goods are even manufactured in those West bank settlements. It doesn’t seem like there is meaningful infrastructure there. What are we talking about here, canned pickles and cookie trays?
• Kharenis: That’s reasonable. The settlements should absolutely be denounced and ostracised by the international community.
• rulingthewake243: What are the most popular things ireland is importing from the west bank?

What is virtually inevitable at this point, yet most people don’t see it coming? (r/AskReddit)

• FreshHotPoop: American consumers are being priced out of consuming
• HaraldFjorskin: Well this thread was depressing.
• NeuralAbomination: There is about to be a massive fuel shortage that isn’t just gonna peter out like the previous ones.

TIL that some archeologists have theorised that the Trojan Horse story is a metaphor for a massive earthquake which destroyed Troy’s walls and let the Greeks in. (r/todayilearned)

• Top_Divide6886: If humans become an interstellar species people will argue if the Garden of Eden was a metaphor for earth
• notthephonz: Hm, don’t both horses and earthquakes fall under Poseidon’s domain?
• Korwinga: But how did they get the earthquake to go inside of the horse?

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My manager is now super supportive after I quit. (Blind)

• skrulll (Chime): Unless they’re handing you promotion now to make you stay it probably doesn’t mean anything. He’s probably being nice so you don’t say much against him in exit interview
• L0NGVIEW (Roblox): Your manager no longer has any power over you so being nice is a smart move for them.
• Mister X (Cohesity): He doesn’t want your exit interview to reflect badly on him

SWE Salaries are about to collapse (Blind)

• XpBs23 (Meta): Best way to move forward is to take a low base but high equity in an early stage startup.
• 🤡-show (Google): 90k is poverty in Bay Area. You gotta be coping hard OP.
• idle. (Dropbox): It’s currently looking like a bimodal distribution.

Erin Brockovich launches map of over 4,200 data centres in the US, appeals for local communities to report environmental impact and other costs (r/technology)

• trudyik: It’s the classic corporate playbook: privatize the massive profits of AI while socializing the infrastructure and resource costs onto local taxpayers. Tech companies build these multi-billion dollar complexes, secure massive state-level tax incentives that drain local public coffers, and then demand millions of gallons of public drinking water to cool their chips. If AI is as immensely profitable as Silicon Valley claims it is, they should be paying a premium tax rate to the communities they are occupying, rather than relying on residents to blow the whistle on the local damage.
• t-g-l-h-: Look at all those red state datacenters
• PhazePyre: Shit, we about to get Erin Brockovich 2 in like 5-10 years?

US Law Enforcement Warns of ‘Anti-Tech Extremism’ as AI Hatred Grows (r/technology)

• Memitim: I see that the betrayers are already getting that loaded language ready to use as an excuse to betray more Americans.
• BarelyAirborne: Funny how we never hear about anti-working class extremism.
• kebabsoup: There you go, if you threaten their bottom line and refuse to be subjugated by the tech billionaires you will be branded an extremist and you will be hunted down.

Uber burned through its entire 2026 AI budget in four months. Now its COO is questioning whether it’s worth it (r/technology)

• TT5i0: Sounds like they will be doing layoffs soon so they can allocate more to the AI budget
• Haunterblademoi: They miscalculated their expenses, and then realized that AI is too expensive.
• marvinfuture: Just wait until AI isn’t subsidized and it’s astronomically more expensive when required by investors to turn a profit

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What happened

Anthropic’s official engineering blog published How we contain Claude across products, a May 25, 2026 post about the containment architectures behind claude.ai, Claude Code, and Claude Cowork.

The core argument is that agent safety is becoming a blast-radius engineering problem. As agents get more capable, the value of giving them real access rises, but so does the damage they could do if they misbehave, follow malicious instructions, or are steered by hostile content. Anthropic frames risk as two separate quantities: how likely a failure is, and how much harm a failure can cause. Better models, classifiers, prompts, and training can reduce the first quantity, but the second has to be capped by deterministic boundaries such as sandboxes, virtual machines, filesystem controls, and network egress policy.

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The hard question after the race to build one

This article starts from a useful shift in perspective. The field has spent decades asking whether quantum computers can be built at all. Now that companies and laboratories can assemble machines with hundreds or thousands of qubits, the sharper question is what those machines will actually be good for.

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This summary covers The Economist’s May 9th, 2026 China article listed in the contents as US-China AI negotiations and published under the headline A MAD problem.

The article argues that artificial intelligence is becoming a strategic problem of the sort usually associated with nuclear weapons: both America and China fear the danger, but neither wants to slow down if the other might race ahead. That tension is what makes AI diplomacy urgent and difficult. The technology promises economic power, military leverage and scientific advantage. It also raises the prospect of cyberattacks, biological misuse and systems that become hard for humans to control.

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The Pragmatic Engineer surfaced this May 26, 2026 deepdive through its latest archive and feed, and the original piece is State of the software engineering job market in 2026.

The useful thing about this report is that it refuses the two simplest stories about engineering hiring. The market is not back to the easy-growth world of 2021, but it is also not frozen. Hiring is recovering, unevenly, and the shape of that recovery says a lot about what companies now value: proven engineering ability, AI-adjacent skills, industry context, and proximity to the places where companies are still willing to concentrate teams.