Search⌘ K
AI Features
Home
Courses
Grokking the Coding Interview Patterns in C++

Number of Wonderful Substrings

Explore how to identify and count wonderful substrings within a given string using hash maps. Learn to handle substrings with at most one letter appearing an odd number of times, applying efficient hashing techniques in C++.

We'll cover the following...

Statement

A wonderful string is defined as a string in which at most one letter occurs an odd number of times.

For example:

  • The string “aabbc” is wonderful because only the letter 'c' appears an odd number of times.

  • The string “pqpq” is wonderful because all letters appear an even number of times.

  • The string “mn” is not wonderful because both 'm' and 'n' appear an odd number of times.

You are given a string word that ...