Leetcode Problem 514. Freedom Trail

514. Freedom Trail

Leetcode Solutions

Create a map to store the indices of each character in the ring.
Define a recursive function that takes the current position on the ring and the index of the current character in the key.
If the current index is equal to the length of the key, return 0 as we have spelled out the entire key.
If the result for the current subproblem is already computed, return it from the memoization table.
For the current character in the key, explore all indices in the ring where this character is present.
For each index, calculate the minimum distance from the current position in both clockwise and anticlockwise directions.
Recursively call the function for the next character in the key and add the minimum distance to the result.
Store the result in the memoization table before returning it.
The initial call to the recursive function will be with the starting position (0) and the first character of the key (index 0).
Add the length of the key to the result to account for the button presses.

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