Generated by Codex with GPT-5
Difficulty: HARD
Problem: Guess the Word
This is an interactive guessing problem. There is a hidden six-letter word inside the given list, and the only way to learn about it is to call master.guess(word). The API returns how many positions match the secret exactly. For example, if the guess and secret have the same letter in positions 0, 2, and 5, the response is 3.
Generated by Codex with GPT-5
Difficulty: MEDIUM
Problem: Word Search
The problem gives a 2D grid of characters and a target word. The task is to decide whether the word can be formed by walking through adjacent grid cells. Each step may move up, down, left, or right, and the same cell cannot be used twice in the same word path.
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Difficulty: MEDIUM
Problem: Remove Duplicates from Sorted Array II
The input is a sorted array nums. The task is to modify it in place so every distinct value appears at most two times, while keeping the original relative order of the remaining values. The function returns k, the length of the valid prefix. Anything after index k - 1 does not matter.
Generated by Codex with GPT-5
MEDIUMArray, Hash Table, Prefix SumGiven an integer array nums and an integer k, count how many contiguous subarrays have a sum divisible by k.
The word “contiguous” is the key constraint. A valid answer must count ranges like nums[left:right + 1], not arbitrary subsets. The same element can participate in many different subarrays, and overlapping ranges are counted separately.
Generated by Codex with GPT-5
NVIDIA’s official technical blog published Achieving Peak System and Workload Efficiency on NVIDIA GB200 NVL72 with Slurm Block Scheduling, a post about making classic HPC scheduling understand rack-scale AI systems where NVLink locality is no longer a soft preference.
The core issue is that GB200 NVL72 changes the unit of useful allocation. A single rack spans 72 Blackwell GPUs across 18 compute trays, connected by fifth-generation NVLink into one coherent high-bandwidth domain. Inside that domain, each GPU has access to very high bidirectional bandwidth, and the rack reaches an aggregate bandwidth scale that makes intra-rack communication feel like a first-class part of the machine. Once a workload crosses outside the NVLink domain, communication falls back to the external fabric, such as InfiniBand or Ethernet, with a much lower bandwidth profile. That creates a sharp performance cliff rather than a smooth locality gradient.
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This article returns to one of the most compelling places in the solar system: Enceladus, the small icy moon of Saturn that sprays material from a hidden ocean into space. The basic reason for its scientific appeal is straightforward. Scientists do not have to drill through the ice to sample the ocean below. Enceladus is already doing part of the work for them by venting plumes of water and ice grains from fractures near its south pole.
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Techmeme surfaced this May 8, 2026 story in its Techmeme item, and the original article is The Wall Street Journal’s Apple, Intel Have Reached Preliminary Chip-Making Agreement.
Apple and Intel have reportedly reached a formal agreement for Intel to manufacture some chips for Apple devices. The exact products are not yet clear, which is an important caveat: this could range from a limited component order to a more meaningful role in Apple’s device roadmap. Even with that uncertainty, the deal is notable because Apple has spent years relying heavily on Taiwan Semiconductor Manufacturing Company for the advanced chips used across iPhone, iPad, Mac, and other products.
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This summary covers The Economist’s April 25th, 2026 International article listed in the contents as America's arms industry and published under the headline Shooting to prominence.
The article argues that America’s defence industry is entering a disruptive phase. The Pentagon still relies on giant contractors such as Lockheed Martin, RTX and Northrop Grumman, but war is changing faster than their procurement habits. Cheap drones, software-defined weapons and battlefield AI are making older, costlier systems look ill-suited to some of the conflicts the United States is now fighting or preparing for.
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Generated by Codex with GPT-5