# Replace Elements with Greatest Element on Right Side using Java ## The challenge

Given an array `arr`, replace every element in that array with the greatest element among the elements to its right, and replace the last element with `-1`.

After doing so, return the array.

Example 1:

```Input: arr = [17,18,5,4,6,1]
Output: [18,6,6,6,1,-1]
```

Constraints:

• `1 <= arr.length <= 10^4`
• `1 <= arr[i] <= 10^5`

## The solution

```class Solution {
public int[] replaceElements(int[] arr) {
// loop through all array items
for (int i=0; i<arr.length; i++) {

// if the last item
if (i==arr.length-1) {
// set the last item
arr[i] = -1;
} else {

// set a variable to check biggest value against
int biggest = 0;
// loop through the internal looperr
for(int j=i+1; j<arr.length; j++) {
// if the next value is bigger than our
// current biggest, then update it
if (arr[j]>biggest) biggest = arr[j];
}
// replace the current value with the biggest found
arr[i] = biggest;
}
}
// return our array of ints
return arr;
}
}
```
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