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困惑，求助，为什么可以用rate[A][B]来表示汇率？

Posted by tiankangwei at 2011-05-25 13:18:18 on Problem 1860 
"There can be several points specializing in the same pair of currencies"
这说明从货币A换到货币B可能有数种不同的汇率，
那么两个点间可能同时存在数条权值不同的边。为什么一个数组rate[A][B]就可以表示呢？
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