I would go with HoA, given the description of the problem so far. The hash would use error messages as its keys, with references to two-element arrays (latest timestamp, count) as its values.

Alternately, you might find it easier to just push timestamps onto the arrays. The size would then be the count and (assuming a sorted input file) the last-added timestamp would be the most recent.

In reply to Re^3: Problem Parsing Log Files by dsheroh
in thread Problem Parsing Log Files by ajay.awachar

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