Simple Sudoku Solvers SII, EI: Dyalog APL
Summary
An APL-based Sudoku solver in the Simple Sudoku Solvers series demonstrates solving a 9x9 grid using MRV-backed backtracking and extensive array operations. The post emphasizes a compact 9-bit candidate mask, a flattened 81-value board, and a solver loop structured around propagation, candidate search, and branching, while addressing the quirks of Dyalog APL.