Is MAC48 Address?

My solution:

bool isMAC48Address(string inputString) 
{
    return Regex.IsMatch(inputString, "^([0-9A-F]{2}-){5}[0-9A-F]{2}$");
}

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Elections Winners

My solution:

int electionsWinners(int[] votes, int k) 
{
    var max = votes.Max();
    return k == 0 && votes.Where(d => d == votes.Max()).Count() == 1 ? 1 : votes.Count(t => t + k > max);
}

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buildPalindrome

My solution:

string buildPalindrome(string st) 
{
    var i = 0;
    while (!st.Substring(i).ToArray().SequenceEqual(st.Substring(i).Reverse().ToArray()) && i < st.Length)
        i++;

    return st + new string(st.Substring(0, i).Reverse().ToArray());
}

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Find Email Domain

My solution:

string findEmailDomain(string address) 
{
    return Regex.Match(address, "@[A-z0-9\\.-]+$").Value.Substring(1);
}

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isBeautifulString

My solution:

bool isBeautifulString(string inputString) 
{
    var sorted = Enumerable.Range('a', inputString.Max(c => c) - 'a' + 1).Select(i => (char)i).ToArray();
    for (var i = 1; i < sorted.Length; i++)
        if (inputString.Count(c => c == sorted[i]) > inputString.Count(c => c == sorted[i - 1]))
            return false;

    return true;
}

Terms of use: http://stackoverflow.com/a/314508 by http://stackoverflow.com/users/4685/pop-catalin, modified under https://creativecommons.org/licenses/by-sa/3.0/.

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Bishop and Pawn

My solution:

bool bishopAndPawn(string bishop, string pawn) 
{
    return Math.Abs(bishop[1] - pawn[1]).Equals(Math.Abs(bishop[0] - pawn[0]));
}

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digitDegree

My solution:

int digitDegree(int n) 
{
    if (n < 10)
        return 0;

    var times = 0;
    var sum = n.ToString().Select(x => int.Parse(x.ToString())).Sum();
    while (sum >= 10 || n >= 10)
    {
        times++;
        n = sum;
        sum = n.ToString().Select(x => int.Parse(x.ToString())).Sum();
    }

    return times;
}

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