September 2017 Update

Task/Sudoku/Sidef/sudoku.sidef

@@ -5,38 +5,34 @@ func check(i, j) is cached {
     jd == id && return true
     jm == im && return true
 
-    var id2 = id//3
-    var jd2 = jd//3
-
-    jd2 == id2 || return false
-
-    jm//3 == im//3
+    (id//3 == jd//3) &&
+    (jm//3 == im//3)
 }
 
-func solve(board) {
-    for i in ^board {
-        board[i] && next
-        var *t = board[^board -> grep {|j| check(i, j) }]
+func solve(grid) {
+    for i in ^grid {
+        grid[i] && next
+        var t = [grid[{|j| check(i, j) }.grep(^grid)]].freq
 
         { |k|
-            t.contains(k) && next
-            board[i] = k
-            solve(board)
-        } * 9
+            t.has_key(k) && next
+            grid[i] = k
+            solve(grid)
+        } << 1..9
 
-        board[i] = 0
+        grid[i] = 0
         return nil
     }
 
-    for i in ^board {
-        print "#{board[i]} ";
+    for i in ^grid {
+        print "#{grid[i]} "
         print " "  if (3  -> divides(i+1))
         print "\n" if (9  -> divides(i+1))
         print "\n" if (27 -> divides(i+1))
     }
 }
 
-var board = %i(
+var grid = %i(
     5 3 0  0 2 4  7 0 0
     0 0 2  0 0 0  8 0 0
     1 0 0  7 0 3  9 0 2
@@ -50,4 +46,4 @@ var board = %i(
     0 5 0  6 9 0  0 1 0
 )
 
-solve(board)
+solve(grid)