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Grokking the Coding Interview Patterns in C#

Solution: Minimum Number of Pushes to Type Word II

Understand how to solve the problem of typing a word with minimum key presses by tracking letter frequencies and greedily remapping keys on a telephone keypad. Learn to implement an efficient solution in C# that uses sorting and frequency analysis to assign letters to keys, minimizing total presses.

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Statement

The keys (numbered 22 to 99) on a telephone keypad are associated with specific groups of lowercase English letters. Below is an example of how letters can be mapped to keys on a telephone keypad.

Note: The keys 11, ∗*, 00, and #\# do not map to any letters.

In the above mapping, the key 22 is mapped with letters ["a", "b", "c"]; pressing it once types "a", pressing it twice types "b", and pressing it three times types "c".

Any mapping is possible as long as each letter is assigned to exactly one key, and keys can be mapped to any number of distinct letters.

Given a string, word, consisting of lowercase English letters, return the minimum number of pushes needed to type it after remapping ...