rows = [3,2,1,3,6,6, 1,21] columns = [1,4,1,2,2, 6, 8,4] The above arrays represent the row numbers and column numbers for queens in N Queen problem. How many row attacks are there? a. 4 b. 2 c. 3 d. 6 Note: Select 1 answer from 4 options.

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Hash Table

A hash table also called a hash map, is a data structure that maps key-value pairs. The hash table can be used in complex systems to provide fast access and compact storage. A hash table is a structure that stores data in an abstract data type kind of associative array. It keeps data in an array format, with a distinct index value for every data value. If the index of the required data is known, then the data can be accessed very easily.