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kotlinlang

The description for the problem `Index of Maximum` doesn't mention that the last index of the largest element should be returned.
Source: <https://try.kotlinlang.org/#/Examples/Problems/Index%20of%20Maximum/Index%20of%20Maximum.kt>

Original description:
```/*
 * Your task is to implement the indexOfMax() function so that it returns
 * the index of the largest element in the array, or null if the array is empty.
 */```
A simple solution which fulfills the description but fails for the last two test cases:
```fun indexOfMax(a: IntArray): Int? {
    return if(a.isEmpty()) null else a.indexOf(a.max()!!)```
The last two test cases contain the largest value multiple times and expect that the `indexOfMax` return the last index of the larget value.