Minimum Spanning Tree by I., S.(less slow)

(wd@(;:inv)@;~"_1'TF'{~2=/\~.@,<@((]+./ .*1"_`[`]})|:@>)^:_/\.&.|.@(=@[;;/@i.)}:"1)(;:/:0&do)];._1(,stdin)LF

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