Understanding the counting pattern
Some problems require us to remember some or all occurrences of data items in a sequence of items, which can be any linear data structure like an array, string, or linked list. While there are many ways to solve such problems, a hash table that maps each data item to its count (frequency) can solve such problems efficiently. The counting technique iterates through the sequence while maintaining the count (frequency) of data items seen so far in a hash table.
The counting pattern is a classification of problems that can be solved using the counting technique.
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The counting technique counts the frequency of all items in an array using a hash map.
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