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Topic: product of two number in a array (Read 1119 times) |
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witee
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product of two number in a array
« on: Oct 15th, 2010, 11:05pm » |
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Given a array of n distinct integer. Find all pairs of x,y
in the array such that z(given) = x * y...do it without sorting and in a most efficient manner..
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towr
wu::riddles Moderator
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Re: product of two number in a array
« Reply #1 on: Oct 16th, 2010, 4:12am » |
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You could start by filtering out the elements that divide z. And of course a hashtable would make easy work of this problem.
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Wikipedia, Google, Mathworld, Integer sequence DB
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birbal
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Re: product of two number in a array
« Reply #2 on: Oct 25th, 2010, 9:50am » |
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Create a hash table from the numbers that divide z. Divide z by a number and check for quotient in the table.
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