doublesubscription是不是允許任意實數作下標,
如果是,那列印十是否先印
a[-2.2.-2.2] a[-2.2,-2.1] [-2.2,-2.0]
a[-2.1.-2.2] a[-2.1,-2.1] [-2.1,-2.0]
a[-2.0.-2.2] a[-2,0,-2.1] [-2.0,-2.0]
像這樣先排前下標再排後下標印出.
而且輸入時如果前下標太多種,是不是會讓很多列只有第一個元素有值,
然後就要換行,很沒效率,畢竟double要相同是困難點兒.
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