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Give a regular expression to describe phone numbers in all the various forms you can think of. Consider international numbers as well as the fact that different countries have different numbers of digits in area codes and in local phone numbers.
shahabazeem
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Give a regular expression to represent salaries as they might appear in employment advertising. Consider that salaries might be given on a per hour, week, month or year basis. They may or may not appear with a dollar sign or ... classified ads in a newspaper, or on-line jobs listings to get an idea of what patterns might be useful.
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sonalrawat
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Consider the following strategy to convert an undirected graph with negative edge weights to one that does not have negative edge weights. Let the maximum magnitude negative edge weight in the graph be -k. Then, for each edge in the graph with weight w, update the weight to w+k+1. Consider the following claim: To solve the shortest path problem in the original graph, we can run Dijkstra's algorithm on the modified graph and subtract the added weights to get the original distances. Which of the following is not correct. The claim is not true in general. The claim is not true in general for graphs with cycles. The claim is true for connected acyclic graphs. The claim is true for all graphs.
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Consider a divide and conquer algorithm that divides an input of size n into a subproblems, each of size n/b, and the cost of dividing and merging the problems is given by f(n) = Θ(n^c). The Master Theorem classifies this into different cases based on the value of c in relation to log_b(a). Could you explain the intuition and reasoning behind these classifications?
dhruba
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Algorithms
May 29, 2023
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algorithms
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