If you have `arr1` and `arr2`, declared thusly, `arr1=arr2` will work in one case, and not in the other one. Not the only difference, but the first one to get you started in the right direction.
– Sam VarshavchikApr 10 '20 at 11:54
2
That's a question about performance, but answers also describe difference https://stackoverflow.com/questions/30263303/stdarray-vs-array-performance
– fasApr 10 '20 at 11:54