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wu :: forums    riddles    medium (Moderators: william wu, towr, ThudnBlunder, Grimbal, SMQ, Eigenray, Icarus)    River Crossing (III) « Previous topic | Next topic » Pages: 1  Reply Notify of replies Send Topic Print    Author  Topic: River Crossing (III)  (Read 548 times) ThudnBlunder wu::riddles Moderator Uberpuzzler The dewdrop slides into the shining Sea     Gender: Posts: 4489 River Crossing (III)   « on: Jun 1st, 2003, 4:37am » Quote Modify Three couples must cross a river to the other side. No wife can be in the presence of another man without her jealous husband being present. If the boat holds only two people, how many trips are necessary to get everyone across without anyone losing their honour?       IP Logged THE MEEK SHALL INHERIT THE EARTH.....................................................................er, if that's all right with the rest of you. redPEPPER Full Member     Posts: 160 Re: River Crossing (III)   « Reply #1 on: Jun 2nd, 2003, 4:34am » Quote Modify This one is pretty linear again, as there's only one thing you can do if you don't want to go backwards.  H1 to H3 are the husbands, W1 to W3 are the respective wives, b is the boat, ~~ is the river.   H1 H2 H3 W1 W2 W3 b ~~~~~~~~~~ .     H1 H2 W1 W2 ~~~~~~~~~~ H3 W3 b     H1 H2 H3 W1 W2 b ~~~~~~~~~~ W3     H1 H2 H3 ~~~~~~~~~~ W1 W2 W3 b     H1 H2 H3 W3 b ~~~~~~~~~~ W1 W2     H3 W3 ~~~~~~~~~~ H1 H2 W1 W2 b     H2 H3 W2 W3 b ~~~~~~~~~~ H1 W1     W2 W3 ~~~~~~~~~~ H1 H2 H3 W1 b     W1 W2 W3 b ~~~~~~~~~~ H1 H2 H3     W1 ~~~~~~~~~~ H1 H2 H3 W2 W3 b     W1 W2 b ~~~~~~~~~~ H1 H2 H3 W3     . ~~~~~~~~~~ H1 H2 H3 W1 W2 W3 b   IP Logged FiBsTeR Senior Riddler     Gender: Posts: 581 Re: River Crossing (III)   « Reply #2 on: Jul 17th, 2007, 6:07pm » Quote Modify Prove that for any number of couples greater than three, it is NOT possible for the husbands and wives to cross a river on a raft that carries only two people, and with the condition that no wife can be left with another man without her husband present. « Last Edit: Jul 22nd, 2007, 5:29am by FiBsTeR » IP Logged FiBsTeR Senior Riddler     Gender: Posts: 581 Re: River Crossing (III)   « Reply #3 on: Jul 22nd, 2007, 5:29am » Quote Modify Hint: .kroW IP Logged Pages: 1  Reply Notify of replies Send Topic Print Forum Jump: ----------------------------- riddles -----------------------------  - easy => medium   - hard   - what am i   - what happened   - microsoft   - cs   - putnam exam (pure math)   - suggestions, help, and FAQ   - general problem-solving / chatting / whatever ----------------------------- general -----------------------------  - guestbook   - truth   - complex analysis   - wanted   - psychology   - chinese « Previous topic | Next topic »

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