推 jackychc:我猜 3 是只能使用 3 種硬幣面額：1,5,10，50不能用 12/01 00:39
我也要問
part2中
How many different kinds of coins can be used in the solution? For example,
if this value is 3, then only the first three denominations, 1, 5, 10, can be
used.
是啥意思啊??
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