thepigeongenerator/sudoku-algo
1
0
Fork 0
Code Issues Pull Requests Activity

write a funciton to not remove the value if the value has already been set.

Browse Source
This commit is contained in:
Quinn
2025-07-29 12:50:28 +02:00
parent b12fff9d22
commit 8fefe103f0
1 changed files with 9 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

13
src/sudoku.c
View File

@@ -14,14 +14,19 @@ void sudoku_init(u16 *board) {
}
}
void sudoku_place(u16 *board, u16 val, uint idx) {
/* removes `val` from `*brd`, if `*brd` is not equal to `val` */
static inline void setbrdpos(u16 *brd, u16 val) {
*brd &= ~(val & -(*brd != val));
}
void sudoku_place(u16 *brd, u16 val, uint idx) {
uint icol = idx % SUDOKU_DEPTH;
uint irow = idx - icol;
uint ibox = idx - (idx % SUDOKU_DEPTH_SQRT);
for (uint i = 0; i < SUDOKU_DEPTH; i++) {
board[irow + i] &= ~val;
board[icol + (i * SUDOKU_DEPTH)] &= ~val;
board[ibox + (i / SUDOKU_DEPTH_SQRT * SUDOKU_DEPTH) + (i % SUDOKU_DEPTH_SQRT)] &= ~val;
setbrdpos(&brd[irow + i], val);
setbrdpos(&brd[icol + (i * SUDOKU_DEPTH)], val);
setbrdpos(&brd[ibox + (i / SUDOKU_DEPTH_SQRT * SUDOKU_DEPTH) + (i % SUDOKU_DEPTH_SQRT)], val);
}
}