Author: 红葉 (MOMIJI), from China, this question comes from his personal blog.
Connect islands (the circles with numbers) with as many bridges as the number in the island. there can be no more than two bridges between two islands. bridges cannot go across islands or other bridges. in the finished solution the bridges will form a continuous link between all the islands.
Nikoli linkfor an example.
Solution code: total number of vertical bridge connections in each column, reading left to right, with 0's for columns without bridges.
example:
on 24. January 2023, 20:00 by TJReds
penpa: https://tinyurl.com/2gclhjp8
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