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Discussion of Problem 1847. Zamkadye

Shen Yang is this proble TSP problem?? [2] // Problem 1847. Zamkadye 21 Nov 2017 07:24
I think it is a NP hard problem ,how could it be solved with range 1000??
Shen Yang Re: is this proble TSP problem?? [1] // Problem 1847. Zamkadye 21 Nov 2017 07:28
could it be solved by LKH algo??
Shen Yang Re: is this proble TSP problem?? // Problem 1847. Zamkadye 26 Nov 2017 13:14
LKH got Accepted but it is at least O(n^3)

how can it AC 15ms??