def solve(self, cipher):
        """
        partial quick sort
        :param cipher: the cipher
        """
        N, A = cipher
        if N % 2 == 1:
            return self.find_kth(A, 0, N - 1, 2 / (N - 1))
        else:
            raise IndexError
dataset/ETHPy150Open algorhythms/HackerRankAlgorithms/Find the Median.py/Solution.solve/swapped operands of `/`