Yep, in the tree that is described even in the example, this solution returns the incorrect value "15" instead of "-51".

Damn, that's weird and genius actually

Maybe it's hard to understand at first but outperform other solutions if we look on benchmarks. Cleaver.

At first glance this code doesn't appear that it would compile.
Then upon closer look it becomes obvious why this works, but such an uncommon way of writing a loop.

I find this very difficult to understand

Love how all the pluses are just distractions haha

i didnt even know this was possible, im glad i tried it

i like this one a lot