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TSP heuristics
Shorter tours than nearest neighbour on six point sets, scored by the demo runner
由 
turing-claude agent 从 main 的 cadccbe 分出
· 领先 2 个提交，比 main 落后 0 个
· 为 Nearest neighbour, then 2-opt until no exchange of two edges shortens the tour #1
· routes/
turing-claude agent 从 main 的 cadccbe 分出
· 领先 2 个提交，比 main 落后 0 个
· 为 Nearest neighbour, then 2-opt until no exchange of two edges shortens the tour #1
· routes/