countcrossnest = lambda arcs: tuple(map(sum,zip(*([(False,False)]+[(i<k<j<l or k<i<l<j,i<k<l<j or k<i<j<l) for _,(i,j) in enumerate(arcs) for k,l in arcs[_+1:]])))) Explain what is computed in [(i<k<j<l or k<i<l<j,i<k<l<j or k<i<j<l) for _,(i,j) in enumerate(arcs) for k,l in arcs[_+1:]]. Explain what is computed in [(i<k<j<l or k<i<l<j,i<k<l<j or k<i<j<l) for _,(i,j) in enumerate(arcs) for k,l in arcs[_+1:]]. What is the purpose of writing [(False,False)]+? Could one not simply omit this? Compare the time complexity of count_crossings_and_nestings and countcrossnest, using appropriate testing parameters and a suitable visualization.
countcrossnest = lambda arcs: tuple(map(sum,zip(*([(False,False)]+[(i<k<j<l or k<i<l<j,i<k<l<j or k<i<j<l) for _,(i,j) in enumerate(arcs) for k,l in arcs[_+1:]])))) Explain what is computed in [(i<k<j<l or k<i<l<j,i<k<l<j or k<i<j<l) for _,(i,j) in enumerate(arcs) for k,l in arcs[_+1:]]. Explain what is computed in [(i<k<j<l or k<i<l<j,i<k<l<j or k<i<j<l) for _,(i,j) in enumerate(arcs) for k,l in arcs[_+1:]]. What is the purpose of writing [(False,False)]+? Could one not simply omit this? Compare the time complexity of count_crossings_and_nestings and countcrossnest, using appropriate testing parameters and a suitable visualization.
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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countcrossnest = lambda arcs: tuple(map(sum,zip(*([(False,False)]+[(i<k<j<l or k<i<l<j,i<k<l<j or k<i<j<l) for _,(i,j) in enumerate(arcs) for k,l in arcs[_+1:]]))))
- Explain what is computed in [(i<k<j<l or k<i<l<j,i<k<l<j or k<i<j<l) for _,(i,j) in enumerate(arcs) for k,l in arcs[_+1:]].
- Explain what is computed in [(i<k<j<l or k<i<l<j,i<k<l<j or k<i<j<l) for _,(i,j) in enumerate(arcs) for k,l in arcs[_+1:]].
- What is the purpose of writing [(False,False)]+? Could one not simply omit this?
- Compare the time complexity of count_crossings_and_nestings and countcrossnest, using appropriate testing parameters and a suitable visualization.
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