gropingBy + eachCountで実現。
listOf(1, 2, 3, 1, 1, 2).groupingBy { it }.eachCount()
=> {1=3, 2=2, 3=1}
eachCountのリファレンスが詳しい。
https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/each-count.html
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