多个数组最大值的索引

Question

要获取数组arr = [1,1,2,3,1,2,3,3]的最大值索引，我可以这样做：

arr.each_with_index.max

并获取[3, 7]。但是，我不想错过[3, 3]和[3, 6]。欢迎任何帮助！

Answer 1

arr.each_with_index.group_by(&:first).max.last
# => [[3, 3], [3, 6], [3, 7]]

Answer 2

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