1704.HalvesAreAlike.cs

// 1704. 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.

public class Solution {
    public bool HalvesAreAlike(string s) {
        int count1 = 0, count2 = 0;
        for(int i = 0; i < s.Length ; i++){
            if(s[i] == 'a' || s[i] == 'e'|| s[i] == 'i'|| s[i] == 'o'|| s[i] =='u'
               || s[i] =='A'|| s[i] == 'E'|| s[i] == 'I'|| s[i] == 'O'|| s[i] == 'U'){
                if(i < s.Length/2)
                    count1++;
                else
                    count2++;
            }
        }
        return count1 == count2;
    }
}