1607--【USACO】Jigsaw Puzzles

1607: 【USACO】Jigsaw Puzzles

时间限制: 1.000 Sec  内存限制: 64 MB
提交: 23  解决: 0
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The cows have taken up alphabetical jigsaw puzzles. In these puzzles with R (1 <= R <= 10) rows and C (1 <= C <= 10) columns, the edges are not funny-shaped cardboard shapes but rather are letters. Each piece has a serial number and 4 letters (or borders) that must be aligned as in a regular jigsaw puzzle. The pseudo-letter '0' (the digit 0) will represent a border (and a piece can have several borders if it is a corner piece or even the top of column in a, e.g., 4x1 puzzle). Below is a set of six pieces (the borders are marked with lines instead of '0's) assembled in one way (of many) that completes the puzzle:
              +---+  +---+  +---+
              | 1 c  c 3 d  d 5 |
              +-d-+  + a +  +-e-+

              +-d-+  +-a-+  +-e-+
              | 2 b  b 4 b  b 6 |
              +---+  +---+  +---+
Note that each edge letter of each piece matches the border letter of the piece adjacent to it; the borders appear properly on the top, bottom, and sides. Pieces are represented by a serial number and a clockwise list of their four edges (where edges are the letters a..z and 0). Pieces might require rotation when placed in the puzzle. Given a set of pieces, find at least one way to assemble them into a puzzle. Test data for puzzles with larger R and C are easier to solve because they have a more varied set of edge letters.


* Line 1: Two space-separated integers: R and C * Lines 2..R*C+1: Each line contains five space-separated entities: an integer serial number and four edge identifiers


* Lines 1..R*C: Line R*(i-1)+j describes the puzzle piece placed a row i, column j with an integer and five space-separated entities: the serial number of the puzzle piece and the four piece edge identifiers in the order top, right, bottom, left.


输入  复制
2 3 1 c d 0 0 2 0 d b 0 3 c 0 d a 4 b a b 0 5 d 0 0 e 6 0 0 b e
输出  复制
1 0 c d 0 3 0 d a c 5 0 0 e d 2 d b 0 0 4 a b 0 b 6 e 0 0 b


INPUT DETAILS: Describes the input puzzle although with some of the pieces rotated compared to the sample solution. OUTPUT DETAILS: As shown in the diagram in the task text. Other solutions (like reflections) are possible; a grading program will check your answer.