Member Avatar for anku83

How can we detect redundant rows.and maintain their count.
if the rows are like
11111
11111
10101
11111

the result i want is
11111 4
10101 1

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  • Latest Post Latest Post by gon1387
Member Avatar for JamesCherrill

Create a Map with the row values as key and an Integer count as value.
For each row, if that value is already in the map, increment its count. If it's not in the map add it with a count of 1.
You may need some convenient representation for the row values - eg convert the row to a single String

Member Avatar for anku83

cant it be done with use of 2d array.Actually i have no idea how to use map.

Member Avatar for gon1387

Why not put it in a set?

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