Easy solutions

[binrebin]

// check digit frequency
private object Solution {
    private fun equalDigitFrequency(i1: Int, i2: Int): Boolean {

        return i1.length == i2.length && i1.toList().toSet() == i2.toList().toSet()
    }
}

// return n-th element of fibanacci series
private object Solution {
    private fun fibonacci(n: Int): Int {

       var list = mutableListOf<Int>(0,1,1)
        if (n<4) {
            return list[n-1]
        }
        var a = 1
        var b = 1
        var c = 0
        (4..n).forEach {
            c = a+ b
            a = b
            b = c

        }
        return c
    }
}

[igorwojda]

These solutions are not correct - the tests are failing.