Small code changes to match the current report state

src/host/labyrinth/Board.java

@@ -42,6 +42,7 @@ class Board {
     */
    Board(int N, int S) {
       assert (N%2 != 0) : "Board's size has to be an odd number.";
+      assert (S <= (N*N-2)) : "At least 2 tiles has to be without supplies.";
       this.N   = Session.boardSize = N;
       this.S   = S;
       this.W   = 0;
@@ -394,7 +395,7 @@ class Board {
       if (tiles[tileId].hasWalls() >= Const.maxTileWalls)
          return false;
       Range dirs = new Range(DirRange.Begin, DirRange.End, DirRange.Step);
-      for (int dir ; (dir = dirs.get()) != Const.noTileId ; )
+      for (int dir = dirs.get() ; dir != Const.EOR ; dir = dirs.get())
          if (isWallableDir(tileId, dir))
             return true;
       return false;
@@ -457,7 +458,7 @@ class Board {
       for (int tileId, i =0, walls =0, shuffleMark =0 ; true ; ) {
          // randomly pick a wallable tile.
          do {
-            if ((tileId = randTiles.get())== Const.noTileId) {
+            if ((tileId = randTiles.get())== Const.EOR) {
                if (i == shuffleMark)   // Wallable tiles exhausted.
                   return walls;
                else {                  // Re-shuffle and continue.