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This has always been my favorite interview question for programmers. I ask them to write the steps/algorithm for elevator car movement when there are three cars and five landings, using any programming language or pseudo-code. As they explain, I ask several questions that challenge their suggestions, such as I have listed below.It’s a great question because even the best programmers cannot provide a deterministic approach in the allotted few (say, 10) minutes of discussion. It really makes you think. I suggest that you try to come up with a solution. If you can make progress on this problem using sound judgement to come up with a practical approach, you would probably be an excellent programmer.Here are some challenges to get you started:If a wall button is pressed on landing N, while there are cars going UP on N-3, N-2, and N+1, which should be summoned? (basic, obvious, but fundamental)In that same situation, if the second car is stopped for a long time with the doors held open and, meanwhile, the other two cars are at N-2 and N+2, what should be done?Car B is empty on landing N and somebody gets in and presses the button for landing N+1 and the doors close. But that car was already on the way to landing N-3 to pick up somebody. Should the car go down to N-3 first or should it go up to N+1 and a different car be summoned to floor N-3?What if there are many people getting on at landing 1 and going up, filling up every car, and there is somebody on landing 2 who is waiting to go up for a long time but cannot because the cars are always full?What about making the elevators aware of the day of the week and time of the day? When an elevator is idle, should it move to the entry landing that is most often used at that time slot?What if the elevator cars have scales so they can determine whether they are empty or not? How would this impact the movement of the cars?That is just a small sample of the dozens of scenarios. Now that you have read this far I will give you the bad news: I do not have an answer, only an approach:The primary thing I have discovered, when thinking about this problem, is that it seems to be a bad idea to actually summon a specific car to a landing and “lock that in as a destination.” Everything works much better if you have rules for balancing the requests and minimizing ride time, then reevaluate those rules every time there is a change in the situation, such as a car reaching a landing or a button being pressed. The decisions should involve the “movement direction” (up or down) of each car rather than the “destination landing.”I’m not confident that this is the very best approach, mostly because it appears that real elevators don’t always work this way, although it seems that they usually do. But it is a good approach.

If a cyclist is willing to ride carefully and at roughly pedestrian speeds whenever there are any pedestrians within 30 feet or so, I believe the rider with his 20 pound bike deserves the sidewalk option rather than being put into competition with far faster moving drivers with their 3,000 pound Death Machines.Sound a bit extreme? I meant it to. I do believe in slow and careful sidewalk riding at times, but I also recognize that the era of the “bike messengers” has created a problem of abuse by some cyclists.See my two Quora blog entries:Free Peoples TransitandAATTAACK!for samples of my thoughts on “Motorized Manglers” from the 1970s/80s. I’ve become a lot more moderate in my views since then as I’ve seen the Antismokers take similar techniques and extend them far beyond anything I was willing to do in manipulating people’s thoughts and emotions.So with an awareness of my background, you can see why my sympathies lie with courteous cyclists sometimes using low-trafficked sidewalks for their riding.MJM, who thinks a 20 pound bicycle is a helluva lot closer to being a pedestrian than it is to being a 3,000 pound car…

The ride-sharing market is expected to register substantial growth on account of increasing demand for easily accessible and safe urban mobility solutions. A decline in vehicle ownership trends among younger population base could drive the requirement for ride sharing services. People are nowadays more concerned about the harmful emissions generated from vehicles. This has inspired the adoption of for ride hailing services that offer carpooling options.These trends are prominent in urban areas as the spread of technology widens. Therefore, rapid urbanization owing to enhancing employment opportunities coupled with growing traffic congestion could broaden the business horizon for ride hailing companies.Increasing advancements in IoT and AI technology could further allow ride sharing companies to add more functionality and improve the accessibility of their services. Citing an instance, Google Maps introduced a new menu entry called ‘Ride Services' in its latest beta where it provides more accurate faring by sending route information from Maps to the ride-sharing firm. Based on these aspects, Global Market Insights, Inc., estimates that the ride sharing market might hit the USD 50 billion mark by 2026.Rising need to minimize daily commute time could propel the demand for B2B ride sharing solutions among corporate employees. Nowadays, corporate companies are mandating their employees to leverage ride sharing services for daily commutes.Rising concerns over mounting vehicular emissions supported by increasing prevalence of traffic congestions could compel the working class to employ carpooling services over private vehicles. Moreover, increasing presence of new players like Spinlister, GLYD, and TwoGo that provide lucrative offers might enhance the usage of ride-sharing apps in the future.Growing inclination of the younger population towards carpooling and car rental services could intensify the demand for ride sharing apps across Asia Pacific. Office commuters are starting to shift towards these services in order to avoid over-crowded public transport for daily commutes.The region is also witnessing a rise in the emergence of new regional players that are coming up with innovative ride sharing ideas and technologies. Citing an instance, in February 2019, Mahindra Group released its ride sharing and e-mobility service, Glyd in India.Established companies operating in the ride-sharing industry like BlaBlaCar, Ola, Uber, Careem, Scoop, Lyft, Via, Grab, sRide, Waze, ZIFY SAS, TwoGo, and DiDi Chuxing are shifting their efforts on strategies like acquisitions and collaborations to expand their market presence.Taking December 2020 for instance, Uber Technologies Inc. sold Uber Advanced Technologies Group (ATG), its autonomous driving unit, to the self-driving car developer Aurora for $4 billion. This sale would help the ride-sharing firm, accelerate its goal to attain profitability.For More Information: Request Sample - Ride Sharing Market Share, Statistics - Global Growth Forecast 2026