问题描述 在n个银币中有一个是不合格的，不合格的银币比合格银币要轻。 现用天平秤银币，找出不合格的银币，且在最坏情况下秤银币的次数最少。 -Descr iption of the problem in n months there is a silver coin is not up to standard, unqualified than qualified silver coin to light. Silver coins weighing scales are