A set of amateur Sudoku solvers implemented with features from C23 standard.
brute_force.c: Use_BitInt()to encode constraints of the entire board in a single integer.graph_color.c: Use<stdbit.h>to decode constraint bitmasks of each cell.16x16_embed/puzzle.h: Use#embedto load board in a file in compile-time.
Subgrid can be any rectangular as long as X*Y<=61, board size is implicitly (X*Y)*(Y*X).
cc -O2 -std=c23 {pick-algo}.c -I ./{pick-board} -o out && ./out
The latest (2024) c-toolchain is required, only clang-19 with glibc 2.39 can build all combinations. gcc-14 lacks #embed but otherwise work.