Thread: Programming challenge

  1. #1
    Registered User
    Join Date
    Dec 2005

    Programming challenge

    Here's the program I've been working on:

    Broken Necklace
    You have a necklace of N red, white, or blue beads (3<=N<=350) some of which are red, others blue, and others white, arranged at random. Here are two examples for n=29:

    1 2 1 2
    r b b r b r r b
    r b b b
    r r b r
    r r w r
    b r w w
    b b r r
    b b b b
    b b r b
    r r b r
    b r r r
    b r r r
    r r r b
    r b r r r w
    Figure A Figure B
    r red bead
    b blue bead
    w white bead

    The beads considered first and second in the text that follows have been marked in the picture.

    The configuration in Figure A may be represented as a string of b's and r's, where b represents a blue bead and r represents a red one, as follows: brbrrrbbbrrrrrbrrbbrbbbbrrrrb .

    Suppose you are to break the necklace at some point, lay it out straight, and then collect beads of the same color from one end until you reach a bead of a different color, and do the same for the other end (which might not be of the same color as the beads collected before this).

    Determine the point where the necklace should be broken so that the most number of beads can be collected.

    For example, for the necklace in Figure A, 8 beads can be collected, with the breaking point either between bead 9 and bead 10 or else between bead 24 and bead 25.

    In some necklaces, white beads had been included as shown in Figure B above. When collecting beads, a white bead that is encountered may be treated as either red or blue and then painted with the desired color. The string that represents this configuration will include the three symbols r, b and w.

    Write a program to determine the largest number of beads that can be collected from a supplied necklace.

    PROGRAM NAME: beads
    Line 1: N, the number of beads
    Line 2: a string of N characters, each of which is r, b, or w

    SAMPLE INPUT (file

    A single line containing the maximum of number of beads that can be collected from the supplied necklace.
    SAMPLE OUTPUT (file beads.out)

    Consider two copies of the beads (kind of like being able to runaround the ends). The string of 11 is marked.
    wwwbbrwrbrbrrbrbrwrwwrbwrwrrb wwwbbrwrbrbrrbrbrwrwwrbwrwrrb
    ****** *****

    I've been using a for loop to go through the array of characters and counting both ways, but I don't know how to count the w's as both r's and b's without changing the array.

  2. #2
    and the hat of int overfl Salem's Avatar
    Join Date
    Aug 2001
    The edge of the known universe
    Like we haven't seen "programming challenge" as "pathetic attempt to get someone else to do my homework" before now.

    Read the forum rules, post whatever attempt you've made at solving this problem and your questions about the code you're posting.

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