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A MSc's Dissertation Project which focuses on Vehicle Routing Problem with Time Windows (VRPTW), using both exact method and heuristic approach (General Variable Neighbourhood Search)

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Why this imp is accumulated instead of assigned?

https://github.com/dungtran209/Modelling-and-Analysis-of-a-Vehicle-Routing-Problem-with-Time-Windows-in-Freight-Delivery/blob/59b66df215ad9a57f5d66c431836ee5d03aa212c/code/3.%20Test_GVNS_S1.py#L163 Hi Dung, would like to know if possible, why in the or_opt_search and two_opt_search, the best_imp is accumulated on every iteration instead of assigned (so replaced). Thanks in advance.

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Metadata

A MSc's Dissertation Project which focuses on Vehicle Routing Problem with Time Windows (VRPTW), using both exact method and heuristic approach (General Variable Neighbourhood Search)

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