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1#ifndef _SLIDING_TILE_LIB_H
2#define _SLIDING_TILE_LIB_H
3
4#include <istream>
5#include <memory>
6#include <ostream>
7#include <vector>
8
9const int BOARD_DIM = 4;
10const int BOARD_SIZE = BOARD_DIM * BOARD_DIM;
11
12struct InvertedBoard {
13 signed char pos[BOARD_SIZE];
14};
15
16struct Board {
17 signed char board[BOARD_SIZE];
18 bool is_valid() const;
19 signed char hole() const;
20 InvertedBoard invert() const;
21 int distance(const Board& o) const;
22 int distance(const InvertedBoard& invo) const;
23};
24std::istream& operator>>(std::istream& is, Board& board);
25std::ostream& operator<<(std::ostream& os, const Board& board);
26
27struct Step {
28 Board board;
29 std::shared_ptr<Step> prev;
30 std::vector<Step*> successors(std::shared_ptr<Step> shared_this);
31 static signed char adjacent[BOARD_SIZE][5];
32};
33std::ostream& operator<<(std::ostream& os, const Step& step);
34
35
36#endif /* _SLIDING_TILE_LIB_H */