Find Common Characters | Simple Dry Run | Leetcode 1002 | codestorywithMIK
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In this video we will try to solve a good practice Array+String+Map problem : Find Common Characters | Simple Dry Run | Leetcode 1002 | codestorywithMIK
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Problem Name : Find Common Characters | Simple Dry Run | Leetcode 1002 | codestorywithMIK
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Summary :
We need to find the common characters in a list of strings. Here's a summary of the approach :
fillCountArray Method: This helper method takes a string and an array of 26 integers (representing counts for each letter of the alphabet). It increments the counts for each character in the string.
commonChars Method:
Initialization: The method initializes a vector of strings (result) to store the common characters and an integer array count of size 26 to keep track of character frequencies in the first word.
Count Update: It calls fillCountArray on the first word to populate count. Then, for each subsequent word, it uses a temporary count array temp to store character frequencies.
Frequency Comparison: For each character, it updates count to the minimum frequency of that character between the current count and temp.
Result Construction: Finally, it iterates over the count array, and for each non-zero count, it adds the corresponding character to the result the number of times it appears.
Return: The method returns the vector of common characters.
In essence, the solution identifies the minimum frequency of each character across all words and constructs the list of common characters based on these frequencies.
✨ Timelines✨
00:00 - Introduction
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