Remove Array Part

My solution:

int[] removeArrayPart(int[] inputArray, int l, int r) 
{
    return inputArray.Select(i => i).Where((i, i1) => i1 < l || i1 > r).ToArray();
}

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Concatenate Arrays

My solution:

int[] concatenateArrays(int[] a, int[] b) 
{
    return a.Concat(b).ToArray();
}

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First Reverse Try

My solution:

int[] firstReverseTry(int[] arr) 
{
    return arr.Select((i, i1) => i1 == 0 || i1 == arr.Length - 1 ? i1 == 0 ? arr.Last() : arr.First() : i).ToArray();
}

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Array Replace

My solution:

int[] arrayReplace(int[] inputArray, int elemToReplace, int substitutionElem) 
{
    return inputArray.Select(i => i == elemToReplace ? substitutionElem : i).ToArray();
}

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Create Array

My solution:

int[] createArray(int size) 
{
    return Enumerable.Repeat(1, size).ToArray();
}

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Candles

My solution:

int candles(int candlesNumber, int makeNew) 
{
    var sum = candlesNumber;
    while (candlesNumber >= makeNew)
    {
        sum += candlesNumber / makeNew;
        candlesNumber = candlesNumber / makeNew + (candlesNumber - candlesNumber / makeNew * makeNew);
    }

    return sum;
}

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Rounders

My solution:

int rounders(int value) 
{
    if (value < 10)
        return value;

    var ic = value.ToString().Reverse().ToList();
    var s = "0";
    for (var i = 1; i < ic.Count; i++)
    {
        if (ic[i - 1] > '4')
        {
            if (ic[i] == '9')
                ic.Add('1');

            ic[i] = ic[i] != '9' ? (char) (ic[i] + 1) : '0';
        }

        if (i != ic.Count - 1)
            s += "0";
        else if (ic[i] != '9')
            s += ic[i];
        else
            s += "01";
    }

    return int.Parse(new string(s.Reverse().ToArray()));
}

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