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MEDIUMArray, Binary Search, Dynamic ProgrammingAn array of integers is given. The task is to find the length of the longest subsequence whose values are strictly increasing.
The key word is subsequence, not subarray.
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MEDIUMArray, BacktrackingThe input gives a set of distinct candidate numbers and a target. The task is to return every unique combination of candidates whose sum is exactly the target.
Two details define the real problem:
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MEDIUMStringThe problem gives a string and a row count, then asks for the string that would appear if the characters were written in a zigzag pattern and read row by row.
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MEDIUMMath, Dynamic Programming, CombinatoricsThere is an m x n grid. A robot starts in the top-left corner and wants to reach the bottom-right corner. The robot can only move right or down.
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MEDIUMArray, Binary Search, MatrixThe matrix looks two-dimensional, but the key rule makes it behave like one long sorted array:
So the task is not really “search a grid.” It is “search a sorted sequence” while remembering that the sequence happens to be stored in matrix form.
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MEDIUMArray, Hash Table, Sliding WindowThe story sounds specific, but the core problem is simple:
find the length of the longest contiguous subarray that contains at most two distinct values.
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Yuri Milner’s Breakthrough Starshot was announced as a new kind of moonshot: not a government mega-program but a billionaire-backed sprint to another star. The plan sounded almost mythic. A giant laser array on Earth would blast gram-scale spacecraft attached to ultralight reflective sails, accelerating them to about 20 percent of the speed of light and sending them toward Alpha Centauri. Sarah Scoles’s article follows what happened after the splashy launch and finds a more revealing story than simple failure. Starshot did not collapse because the dream was absurd. It stalled because even a dazzling idea cannot outrun the brutal combination of engineering difficulty, long timelines and a patron whose commitment turned out to be much smaller and less durable than advertised.
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This summary covers The Economist’s March 28th, 2026 United States article on pages 20-21, listed in the contents as Going on cyber-offence under the Cyber-security heading.
The article argues that America’s new cyber-strategy marks a real shift in emphasis. Washington still talks about strengthening digital defences, but it is now much more explicit about disrupting threats before they hit American networks. The piece treats that as a consequential change in posture, while warning that offensive ambition may be outrunning the state’s ability to defend its own systems well.
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The Pragmatic Engineer surfaced this April 14, 2026 piece, and the original post is The impact of AI on software engineers in 2026: key trends.
Gergely Orosz and Elin Nilsson use more than 900 survey responses from engineers and engineering leaders to describe how AI coding tools are changing daily software work in practice. The article is less interested in which model won last week and more interested in what happens once these tools become routine: who pays for them, who runs into limits, who benefits most, and what kinds of tradeoffs teams are quietly accepting.
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