HackerRank 'Halloween Party' Solution

Martin Kysel · March 6, 2015

Short Problem Definition:

Alex is attending a Halloween party with his girlfriend Silvia. At the party, Silvia spots the corner of an infinite chocolate bar. If the chocolate can be served as only 1 x 1 sized pieces and Alex can cut the chocolate bar exactly K times, what is the maximum number of chocolate pieces Alex can cut and give Silvia?

Halloween Party


time complexity is O(1)

space complexity is O(1)


The product a*b (where a+b = k) is maximal, when a is close to b as possible. We can only use integral values, so a and b are rounded halves of k.


def oneOneBars(K):
    half = K//2
    return half * (K-half)

if __name__ == '__main__':
    t = input()
    for _ in xrange(t):
        k = input()
        print oneOneBars(k)

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