TAOCP 7.2.2.1 Exercise 62

Section 7.2.2.1: Dancing Links

Exercise 62. ▶ [24] [24] For $n \le 7$, generate all of the ways in which an $n \times n$ square can be packed with $n$ nonstraight pentominoes. (These are the possible arrangements of boxes in a square jigsaw sudoku.) How many of them are symmetric? Hint: See exercise 7.2.2–76.

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Solve time: 6m45s