Is there an algorithm that allows you to place signs between terms to get equality?

Question

Mathematics

Let's say there is an expression:
4 4 4 = 4;
Is there an algorithm that will put + or - signs to get an identity?

Answer 1

If the numbers are different - you can consider this problem as a breadth-first search.
If the same, then this is a simple generation of all permutations in the sequence.

Answer 2

You can use a complete enumeration, you can use a genetic algorithm for the sake of interest (I once implemented it - it works and it's not difficult) - and then you can get approximate results.