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Facility location problem. Suppose there are n facilities to open and m customers to serve. We want to make sure each customer has at least one facility open within 4 hours. Formulate the problem to minimize the number of facilities to open, while satisfying the constraints.
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Senior Operations Research Specialist

Interviewed at Amazon

3.5★
Oct 19, 2020

Facility location problem. Suppose there are n facilities to open and m customers to serve. We want to make sure each customer has at least one facility open within 4 hours. Formulate the problem to minimize the number of facilities to open, while satisfying the constraints.

Write a SQL query to rank scores. If there is a tie between two scores, both should have the same ranking. Note that after a tie, the next ranking number should be the next consecutive integer value. In other words, there should be no "holes" between ranks. +----+-------+ | Id | Score | +----+-------+ | 1 | 3.50 | | 2 | 3.65 | | 3 | 4.00 | | 4 | 3.85 | | 5 | 4.00 | | 6 | 3.65 | +----+-------+ For example, given the above Scores table, your query should generate the following report (order by highest score): +-------+---------+ | score | Rank | +-------+---------+ | 4.00 | 1 | | 4.00 | 1 | | 3.85 | 2 | | 3.65 | 3 | | 3.65 | 3 | | 3.50 | 4 | +-------+---------+
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Operations Research Analyst

Interviewed at Target

3.5★
Aug 10, 2020

Write a SQL query to rank scores. If there is a tie between two scores, both should have the same ranking. Note that after a tie, the next ranking number should be the next consecutive integer value. In other words, there should be no "holes" between ranks. +----+-------+ | Id | Score | +----+-------+ | 1 | 3.50 | | 2 | 3.65 | | 3 | 4.00 | | 4 | 3.85 | | 5 | 4.00 | | 6 | 3.65 | +----+-------+ For example, given the above Scores table, your query should generate the following report (order by highest score): +-------+---------+ | score | Rank | +-------+---------+ | 4.00 | 1 | | 4.00 | 1 | | 3.85 | 2 | | 3.65 | 3 | | 3.65 | 3 | | 3.50 | 4 | +-------+---------+

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