Hi!

I just finished the 100 doors challenge and the only way I could figure it out was to manually do this exercise on paper for the first 20 doors. I know this isn’t the best approach for an interview because it was time consuming but I was banging my head against the wall with my other approaches.

```
function getFinalOpenedDoors(numDoors) {
//create empty door array for final results
let doorArr = [];
// I manually did the exercises for the 1st 20 doors
//to try to find a pattern for the doors that were still open.
//The open doors are all perfect squares.
for(let i=1; i<=100; i++){
if(Math.sqrt(i) % 1 === 0){
doorArr.push(i);
}
}
return doorArr;
}
```

Thanks!