Tell us what’s happening:
Describe your issue in detail here.
**Your code so far**
function sum(arr, n) {
// Only change code below this line
if (n===1){
return arr[0];
}
else if (n<=0){
return 0;
}
else{
return arr[n-1]+arr[arr[n-1]-1]
}
// Only change code above this line
}
**Your browser information:**
User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/99.0.4844.51 Safari/537.36