![]() ![]() Instead of answering the question "how to generate a unique sequence?" (or sequence range, in this case), this solution simply says "I'll just ask Zookeeper to give me one". The reason I think this answer is unsatisfying is because, while it works, it simply shifts the responsibility of generating the "unique" part of the sequence, which, is the hardest part of the problem, to Zookeeper. If the each server has a unique range, then they are guaranteed to generate unique sequences. Each server would be in assigned only one particular range to work with, and Apache Zookeeper is used to coordinate the sequence range assignments. To summarize, the most sophisticated solution proposed in the video is to partition all possible short sequences into ranges, and use a set of servers to return a monotonically increasing sequence, which falls within a range. That being said, they are sort of unsatisfying. Tushar's proposed solutions are quite good and I think most interviewers would be satisfied with them (please watch the video before continuing to read this post). The main problem is the createShort() API: How do you generate a short sequence of characters that is unique among URLs (note that uniqueness is an important property, we don't want different URLs to have the same shortcut). The second one is easy, you simply need to do a lookup and return the long URL (or 404 if none exists). This video discusses a common developer interview question, namely, how do you design a service like TinyURL, which allows users to turn long URLs into short ones that are just several characters long.īasically, a TinyURL-like service would have 2 main APIs: createShort(longUrl) and getLong(shortUrl). Security Council member to address North Korea's nuclear threat.Recently I came across a Youtube video called: System Design : Design a service like TinyUrl, from the channel Tushar Roy - Coding Made Simple. South Korean President Yoon Suk Yeol on Thursday met with Chinese Premier Li Qiang in Jakarta, and asked Beijing to do more as a U.N. The launching ceremony comes as North Korea is set to mark the 75th anniversary of its founding day on Saturday and follows reports that Kim plans to travel to Russia this month to meet President Vladimir Putin to discuss weapons supplies to Moscow. North Korea has a large submarine fleet but only the experimental ballistic missile submarine 8.24 Yongung (August 24th Hero) is known to have fired a missile. North Korea has about 20 Romeo-class submarines, which are powered by diesel-electric engines and are obsolete by modern standards, with most other countries operating them only as training vessels.Īnalysts first spotted signs that at least one new submarine was being built in 2016, and in 2019 state media showed Kim inspecting a previously unreported submarine built under "his special attention" that would operate off the east coast. ![]() Analysts say that perfecting smaller warheads would most likely be a key goal if the North resumes nuclear testing. It is unclear whether North Korea has fully developed the miniaturised nuclear warheads needed for such missiles. Shin said it can take a year or more to evaluate a new vessel at sea, so immediate deployment may be limited. North Korea has test-fired both SLBMs and SLCMs. The rear of the submarine's sail - the tower that juts out of the top of the hull - was expanded and 10 vertical launch tubes, 4 large and 6 small, were installed, likely for SLBMs and SLCMs, he said. mainland, but rather smaller, short-range SLBMs or submarine-launched cruise missiles (SLCM) capable of striking South Korea, Japan, or other regional targets, said Choi Il, a retired South Korean submarine captain. The designation as a "tactical" submarine suggests it does not carry submarine launched ballistic missiles (SLBM) that can reach the U.S. "North Korea's military activity is posing graver and more imminent threat to our country's security than before," Japanese Chief Cabinet Secretary Hirokazu Matsuno told a briefing. North Korea's nuclear weapons and ballistic missile programs are banned by United Nations Security Council resolutions, and the submarine launch drew condemnation from South Korea and Japan. ![]()
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