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Ingy döt Net 2023-07-01 11:58:00 -04:00
parent 7387c8f97b
commit cb5bb5e222
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71
Task/Sudoku/XPL0/sudoku.xpl0 Normal file
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code ChOut=8, CrLf=9, IntOut=11, Text=12;
proc Show(X);
char X;
int I, J;
[for I:= 0 to 8 do
[if rem(I/3) = 0 then CrLf(0);
for J:= 0 to 8 do
[if rem(J/3) = 0 then ChOut(0, ^ );
ChOut(0, ^ ); IntOut(0, X(0));
X:= X+1;
];
CrLf(0);
];
];
func TryCell(X, Pos);
char X;
int Pos;
int Row, Col, I, J, Used;
[Row:= Pos/9;
Col:= rem(0);
Used:= 0;
if Pos = 81 then return true;
if X(Pos) then return TryCell(X, Pos+1);
for I:= 0 to 8 do Used:= Used ! 1 << (X(I*9+Col)-1);
for J:= 0 to 8 do Used:= Used ! 1 << (X(Row*9+J)-1);
Row:= Row/3*3;
Col:= Col/3*3;
for I:= Row to Row+2 do
for J:= Col to Col+2 do
Used:= Used ! 1 << (X(I*9+J)-1);
for I:= 1 to 9 do
[X(Pos):= I;
if (Used&1)=0 & TryCell(X, Pos+1) then return true;
Used:= Used>>1;
];
X(Pos):= 0;
return false;
];
proc Solve(S);
char S;
int I, J, C;
char X(81);
[J:= 0;
for I:= 0 to 80 do
[repeat C:= S(J);
J:= J+1;
until C>=^1 & C<=^9 ! C=^.;
X(I):= if C=^. then 0 else C-^0;
];
if TryCell(X, 0) then Show(X)
else Text(0, "No solution");
];
[Solve("394 ..2 67.
... 3.. 4..
5.. 69. .2.
.45 ... 9..
6.. ... ..7
..7 ... 58.
.1. .67 ..8
..9 ..8 ...
.26 4.. 735 ");
]