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Grokking the Coding Interview Patterns in C++

Solution: Group Anagrams

Understand how to group anagrams from a list of strings by leveraging frequency mapping and hash maps. Explore both naive and optimized approaches to efficiently solve this problem using C++. This lesson helps you analyze time and space complexity to choose the best solution for anagrams in coding interviews.

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Statement

Given a list of words or phrases, group the words that are anagrams of each other. An anagram is a word or phrase formed from another word by rearranging its letters.

Constraints:

Let strs be the list of strings given as input to find the anagrams.

  • 1≤1 \leq strs.length ≤103\leq 10^3
  • 0≤0 \leq strs[i].length ≤100\leq 100
  • strs[i] consists of lowercase English letters.

Note: The order in which the output is displayed doesn’t matter.

Solution

So far, you’ve probably brainstormed some approaches and have an idea of how to solve this problem. Let’s explore some of these approaches and figure out which one to follow based on considerations such as time complexity and any implementation constraints.

Naive approach

The naive approach is to sort all strings first, and then compare them to check whether they are identical. The idea is ...