Leetcode Problem 691. Stickers to Spell Word

691. Stickers to Spell Word

Leetcode Solutions

Define a recursive function helper that takes the current target string and a memoization dictionary dp.
If the target string is empty, return 0 as no more stickers are needed.
If the target string is already in dp, return the stored value to avoid recomputation.
Initialize a variable ans to track the minimum number of stickers needed, starting with infinity.
Convert the target string into a character frequency array tar.
Iterate over each sticker and apply it to the target string: a. Skip the sticker if it doesn't contain the first character of the target string (optimization). b. Create a new target string s by subtracting the sticker's character frequencies from tar. c. Recursively call helper with the new target string s and update ans with the minimum value.
Store the computed minimum value in dp for the current target string.
Return the value stored in dp for the original target string.

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