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 #embed to 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).

Building

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.