finding indices in a sequence of parentheses

[tiissa]

Peter Otten wrote:
> I think no amount of testing will give these strange people confidence.
> "Proof" is the magic word here.

Some would maybe be satisfied if your tests cover the whole set of input.

When that's possible, that may be useless. But that's not a matter to 
bother them with. ;)

(And of course, you just don't tell them how you generated their output 
with the same program.)