07. Determine if String Halves Are Alike.cpp

/*
Determine if String Halves Are Alike
====================================

You are given a string s of even length. Split this string into two halves of equal lengths, and let a be the first half and b be the second half.

Two strings are alike if they have the same number of vowels ('a', 'e', 'i', 'o', 'u', 'A', 'E', 'I', 'O', 'U'). Notice that s contains uppercase and lowercase letters.

Return true if a and b are alike. Otherwise, return false.

Example 1:
Input: s = "book"
Output: true
Explanation: a = "bo" and b = "ok". a has 1 vowel and b has 1 vowel. Therefore, they are alike.

Example 2:
Input: s = "textbook"
Output: false
Explanation: a = "text" and b = "book". a has 1 vowel whereas b has 2. Therefore, they are not alike.
Notice that the vowel o is counted twice.

Example 3:
Input: s = "MerryChristmas"
Output: false

Example 4:
Input: s = "AbCdEfGh"
Output: true

Constraints:
2 <= s.length <= 1000
s.length is even.
s consists of uppercase and lowercase letters.

Hint #1  
Create a function that checks if a character is a vowel, either uppercase or lowercase.
*/

class Solution
{
public:
  bool halvesAreAlike(string s)
  {
    int c1 = 0, c2 = 0;
    for (int i = 0; i < s.size() / 2; ++i)
    {
      if (s[i] == 'a' || s[i] == 'A' || s[i] == 'e' || s[i] == 'E' || s[i] == 'i' || s[i] == 'I' || s[i] == 'o' || s[i] == 'O' || s[i] == 'u' || s[i] == 'U')
        c1++;
    }
    for (int i = s.size() / 2; i < s.size(); ++i)
    {
      if (s[i] == 'a' || s[i] == 'A' || s[i] == 'e' || s[i] == 'E' || s[i] == 'i' || s[i] == 'I' || s[i] == 'o' || s[i] == 'O' || s[i] == 'u' || s[i] == 'U')
        c2++;
    }

    return c1 == c2;
  }
};