# Answer to Question #73552 in Algorithms for L Anderson Jr

Question #73552

Two pairs of integers (a, b) and (c, d) are said to be symmetric if b = c and a = d. For example, given an array of pairs { {31, 57}, {80, 90}, {25, 70}, {90, 80}, {70, 25}, {11, 20}, {10, 5}, {30, 40} }, the symmetric pairs are:

{80, 90} and {90, 80}

{25, 70} and {70, 25}

Design a hash table-based algorithm of time complexity ϴ(n) to identify the symmetric pairs in an array of 'n' pairs.

Show the working of your algorithm for the above array of pairs with a hash function H(K) = K mod 7.

What would this be

{80, 90} and {90, 80}

{25, 70} and {70, 25}

Design a hash table-based algorithm of time complexity ϴ(n) to identify the symmetric pairs in an array of 'n' pairs.

Show the working of your algorithm for the above array of pairs with a hash function H(K) = K mod 7.

What would this be

Expert's answer

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