As a "beginner", I'm glad I managed to do almost the same code as yours, but on rows instead of concatenated into one single line. Thanks !

Remember the KISS principle.

This code doesn't work

Getting to know the libraries? I am always happy to see such solutions, I learn a lot from them.

ONE LINER ALERT

you copied my answer xD

best idea for solution!

Thats wow squared

I thought my solution was very clever... then I saw this.

youre close to your given runtime but using arr1.sort() and arr2.sort() at the start ruins it - try arr1.reverse() and arr2.reverse() instead

This entirely defeats the point of the problem, that being to take advantage of the fact that the arrays are already sorted.

same

HATE RETURN