!7

answer {

  makeBoard(parseFirstInt(s));

}

p {

  bot();

  print("Please type board size.");

  consoleSetInput("8");

}

svoid makeBoard(int size) {

  Web web = simpleWeb();

  for (int row = 1; row <= size; row++)

    for (char col = 'A'; col < (char) ('A'+size); col++) {

      rel(size, web, col, row, (char) (col+1), row, 'right);

      rel(size, web, col, row, (char) (col-1), row, 'left);

      rel(size, web, col, row, col, row+1, 'up);

      rel(size, web, col, row, col, row-1, 'down);

    }

  showWeb(web);

}

svoid rel(int size, Web web, char col1, int row1, char col2, int row2, S rel) {

  S a = cell(col1, row1, size), b = cell(col2, row2, size);

  if (nempty(a) && nempty(b))

    web_addRelation(web, a, b, rel);

}

sS cell(char col, int row, int size) {

  if (row >= 1 && row <= size && col >= 'A' && col < (char) ('A'+size))

    ret col + str(row);

  null;

}