Project Euler #237: Tours on a 4 x n playing board

Hacker
Rank
Score
141
flag of Singapore
01.25
143
flag of India
01.25
146
flag of United States
01.25
147
flag of India
01.25
148
flag of India
01.25
149
flag of United States
01.25
150
flag of Canada
01.25
152
flag of India
01.25
153
flag of Lebanon
01.25
156
flag of India
01.25
157
flag of Hungary
01.25
158
flag of Norway
01.25
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