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Sigmanificient/golfed_sudoku.c

Created June 4, 2024 23:25
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golfed_sudoku.c
#define I(n,m)J(n,m,0)
#define J(n,m,e)for(n=m;--n;o|=e)
#define K(x)int x[9]={0}
o,i,j,x,y;is_sudoku_valid(int s[9][9]){I(i,9)J(j,9,s[i][j]<0||s[i][j]>9);I(y,9){K(c);J(j,9,c[s[y][j]-1]++);K(d);J(i,9,d[s[y][i]-1]++);};I(x,3)I(y,3){K(c);I(i,3)J(j,3,c[s[3*y+i][3*x+j]-1]++);};return !o;}
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