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 Dysfunctional Crossing (Posted on 2005-09-26)
There are 8 people that need to cross a river. The water is too deep and fast to walk or swim across, and the only transportation device available is a raft. The raft can only be operated by adults, cannot float across the river on its own, and can carry at most two people.

The 8 people are a juvenile delinquent, her jailer, and a dysfunctional family of six: mother, father, two sons, and two daughters. To be clear, the only adults are the jailer, the mother, and the father.

Unfortunately some people fight with each other:

• The juvenile delinquent will fight with anybody if her jailer is not present.
• The father fights with either daughter if the mother is not present to mediate.
• The mother fights with either son if the father is not present to mediate.
• How can these 8 people cross the river without any fights? How many trips on the raft did it take?

For a fun way to test out your theories, click here and then click on the blue circle.

 See The Solution Submitted by nikki Rating: 4.1538 (13 votes)

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 Solution | Comment 6 of 30 |
` `
`Here is the output of a program I wrote in Perl(the letters are self-explanatory): `
`  DJFMBBGG  ||        ||    FMBBGG  ||  >DJ>  ||              FMBBGG  ||        ||  DJ          FMBBGG  ||  <J <  ||  D          JFMBBGG  ||        ||  D            FMBGG  ||  >JB>  ||  D            FMBGG  ||        ||  DJB          FMBGG  ||  <DJ<  ||  B          DJFMBGG  ||        ||  B            DJMGG  ||  >FB>  ||  B            DJMGG  ||        ||  FBB          DJMGG  ||  <F <  ||  BB          DJFMGG  ||        ||  BB            DJGG  ||  >FM>  ||  BB            DJGG  ||        ||  FMBB          DJGG  ||  <M <  ||  FBB          DJMGG  ||        ||  FBB            MGG  ||  >DJ>  ||  FBB            MGG  ||        ||  DJFBB          MGG  ||  <F <  ||  DJBB          FMGG  ||        ||  DJBB            GG  ||  >FM>  ||  DJBB            GG  ||        ||  DJFMBB          GG  ||  <M <  ||  DJFBB          MGG  ||        ||  DJFBB            G  ||  >MG>  ||  DJFBB            G  ||        ||  DJFMBBG          G  ||  <DJ<  ||  FMBBG          DJG  ||        ||  FMBBG            D  ||  >JG>  ||  FMBBG            D  ||        ||  JFMBBGG          D  ||  <J <  ||  FMBBGG          DJ  ||        ||  FMBBGG              ||  >DJ>  ||  FMBBGG              ||        ||  DJFMBBGG`
` `

 Posted by Bractals on 2005-09-27 21:32:57

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