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Cường Ngô Beginner
Asked At: 1664792907000 In: Kotlin
Cường Ngô Beginner Asked At: 1664792907000 In: Kotlin
Arraylist trong Kotlin
E có một arraylist với nhiều giá trị thứ [0] trùng nhau, giờ e muốn bỏ hết những giá trị thứ [0] trùng nhau đó nhưng để lại giá trị thứ [1] lớn nhất của giá trị thứ [0] đó thì như thế nào ạ.

Theo như trong hình này thì e chỉ muốn để lại [a,3][b,3][c,3] thôi, em cảm ơn.

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kotlin list
Remain: 5
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monkey Beginner
Added an answer at: 1664822491000
monkey Beginner
Added an answer at: 1664822491000
Em thử code này xem sao nhé: 

val listOfList = listOf(
    listOf("a", 1),
    listOf("a", 2),
    listOf("a", 3),
    listOf("b", 1),
    listOf("b", 2),
    listOf("b", 3),
    listOf("c", 1),
    listOf("c", 2),
    listOf("c", 3)
)

val filteredList = listOfList
    .groupBy { it[0] }
    .map { group ->
        listOf(
            group.key,
            group.value.maxOf { it[1] as Int }
        )
    }
println(filteredList)
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