Günter Rote:

Crossing the bridge at night

EATCS Bulletin (Bulletin of the European Association for Theoretical Computer Science), No. 78, October 2002, 241-246.


We solve the general case of the bridge-crossing puzzle, where n people with different walking speeds have to cross a bridge that can carry at most two people at a time. A flashlight is necessary to cross the bridge but they share only a single flashlight.

The solution is obtained through a graph-theoretic model.

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Last update: December 22, 2004.