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Solution: Find Words That Can Be Formed by Characters

Understand how to solve problems that require checking whether words can be formed from given characters by tracking and comparing character frequencies. Learn to implement frequency maps, iterate through words to assess feasibility, and sum lengths of valid words. This lesson helps you master a common pattern in coding interviews by effectively managing data tracking and comparison.

Statement

You are given an array of strings words and a string chars.

A string in words is considered good if it can be formed using only the characters available in chars, where each character in chars may be used at most once per word.

Return the sum of the lengths of all good strings in words.

Constraints:

  • 11 \leq words.length 1000\leq 1000

  • 11 \leq words[i].length, chars.length ...