TAOCP 7.2.2.1 Exercise 442
Working
Section 7.2.2.1: Dancing Links
Exercise 442. ▶ [M23] Enumerate all hitori covers of $P_m \square P_n$, for $1 \le m \le n \le 9$.
Verified: no
Solve time: 3m19s
Working
Working
Section 7.2.2.1: Dancing Links
Exercise 442. ▶ [M23] Enumerate all hitori covers of $P_m \square P_n$, for $1 \le m \le n \le 9$.
Verified: no
Solve time: 3m19s
Working