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Kotlinで二重list

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#概要
Kotlinで二重listを作る。

#動機
AtCoderで使いたかった。調べてもなかなか出てこなかったので記事にした。

#やり方

var xy_list = MutableList(3){ MutableList(4){0} }

//結果
[[0, 0, 0, 0], [0, 0, 0, 0], [0, 0, 0, 0]]
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