Is Find Most Frequent Vowel and Consonant easy or hard?

Find Most Frequent Vowel and Consonant is considered an Easy problem. It focuses on basic string traversal and frequency counting using a hash table or array. The key skill tested is recognizing that a single-pass counting approach solves the problem efficiently.

Find Most Frequent Vowel and Consonant Python/Java solution

Python and Java solutions typically use a frequency dictionary or an array of size 26. Iterate through the string, increment counts, then compute the maximum frequency for vowels and consonants separately. The algorithm runs in O(n) time and constant space.

How to solve Find Most Frequent Vowel and Consonant in O(n)?

Iterate through the string once and maintain a frequency array or hash map. After counting occurrences, check each character and determine whether it is a vowel or consonant, updating two maximum counters. This avoids repeated scans and guarantees linear time complexity.

What is the best approach for Find Most Frequent Vowel and Consonant?

The best approach is frequency counting in a single pass. Use either a hash table or a fixed array of size 26 to store counts of each character, then track the maximum frequency separately for vowels and consonants. This runs in O(n) time and O(1) space because the alphabet size is constant.

Is Find Most Frequent Vowel and Consonant asked at Google/Amazon/Meta?

Problems involving character frequency counting appear frequently in interviews at companies like Amazon, Google, and Meta. Variations include finding the most frequent character, counting vowels, or grouping characters by frequency. The core idea relies on hash tables or counting arrays.

What data structure is used in Find Most Frequent Vowel and Consonant?

The common data structures are a hash table (dictionary) or a fixed-size integer array for character frequency counting. Both allow constant-time updates while scanning the string. The array approach is slightly faster because it avoids hashing overhead.

What is the time complexity of Find Most Frequent Vowel and Consonant?

The optimal solution runs in O(n) time, where n is the length of the string. Each character is processed once to update its frequency. A second pass through at most 26 letters determines the most frequent vowel and consonant.

Description Hints 2 Solution Video 10:22

3541. Find Most Frequent Vowel and Consonant

Easy89.4% acceptance3 companies

You are given a string s consisting of lowercase English letters ('a' to 'z').

Your task is to:

Find the vowel (one of 'a', 'e', 'i', 'o', or 'u') with the maximum frequency.
Find the consonant (all other letters excluding vowels) with the maximum frequency.

Return the sum of the two frequencies.

Note: If multiple vowels or consonants have the same maximum frequency, you may choose any one of them. If there are no vowels or no consonants in the string, consider their frequency as 0.

The frequency of a letter x is the number of times it occurs in the string.

Example 1:

Input: s = "successes"

Output: 6

Explanation:

The vowels are: 'u' (frequency 1), 'e' (frequency 2). The maximum frequency is 2.
The consonants are: 's' (frequency 4), 'c' (frequency 2). The maximum frequency is 4.
The output is 2 + 4 = 6.

Example 2:

Input: s = "aeiaeia"

Output: 3

Explanation:

The vowels are: 'a' (frequency 3), 'e' ( frequency 2), 'i' (frequency 2). The maximum frequency is 3.
There are no consonants in s. Hence, maximum consonant frequency = 0.
The output is 3 + 0 = 3.

Constraints:

1 <= s.length <= 100
s consists of lowercase English letters only.

Asked at 3 companies

Google Amazon Meta

Topics

Hints open one at a time

Hint 1

Use a hashmap

Hint 2

Simulate as described

10:22

Still stuck?Read the written solution, or watch a walkthrough.

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1class Solution:
2    def maxFreqSum(self, s: str) -> int:
3        

Starter codePython 3Spaces: 4

Examples

Case 1Case 2

Input

"successes"

Input

"aeiaeia"

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