Jelly, (削除) 25 (削除ここまで) 24 bytes
3_2ドル§1⁄2ṀĊ,
Zx2r2\€F€ŒpÇ€Ṃ
I'm sure there was a distance builtin in Jelly, but can't seem to find it... :\ Also, the structure needs work.
PurkkaKoodari
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