Leetcode/2840. Check if Strings Can be Made Equal With Operations II/Solution.cs

public class Solution
{
    public bool CheckStrings(string s1, string s2)
    {
        var d1 = new char['z' - 'a' + 1];
        var d2 = new char['z' - 'a' + 1];
        for (var i = 0; i < s1.Length; i += 2)
        {
            d1[s1[i]-'a']++;
            d1[s2[i]-'a']--;
            if (i + 1 < s1.Length)
            {
                d2[s1[i + 1]-'a']++;
                d2[s2[i + 1]-'a']--;
            }
        }
        foreach (var c in d1)
            if (c != 0)
                return false;
        foreach (var c in d2)
            if (c != 0)
                return false;
        return true;
    }
}