本文主要探讨了在Percolation类中减少WeightedQuickUnionUF对象调用的方法，特别是通过优化.open(int,int)方法来降低不必要的操作，从而提高程序效率。文章强调，在执行任何方法前，应充分考虑所有可能的情况，避免重复或不必要的工作。
1.Call methods when absolutely necessary
the first step to solving it is to look at all of your calls to WeightedQuickUnionUF (WQUUF) objects.I suspect that the most calls are in Percolation.open(int, int) method.A good way to decrease the number of method calls is to restrict the conditions. A method should only be called if absolutely necessary. In other words, don't open a site if it is already open.
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