A set of amateur Sudoku solvers implemented with features from C23 and C2Y 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.
• _c2y.c variants: if declaration and named loop.

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

Compiler/libc requirements:

• <stdbit.h>: glibc v2.39+
• C23 features: gcc-14(#embed needs 15), clang-19, kefir 0.5, slimcc
• C2Y if declaration and named loop: gcc-15, slimcc