Write a function to compute the number of combinations that make up that amount. You may assume that you have infinite number of each kind of coin.
编写函数计算要得到目标金额，有多少种不同的硬币组合方式。
Write a function to compute the number of combinations that make up that amount. You may assume that you have infinite number of each kind of coin.
编写函数计算要得到目标金额，有多少种不同的硬币组合方式。
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