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Arithmetic expressions without redundant parentheses. Knuth's TAOCP has Dudeney's Digital Century puzzle 7.2.1.6 problem 122 and it includes a description of expression grammar that generates expressions without redundant parentheses.
Swift implementation of Donald Knuth's multi-precision unsigned integer division Algorithm D, from The Art of Computer Programming, Vol 2: Semi-numerical Algorithms, Chapter 4.3.3