My doubt is in problem "Riding the Fences" from Usaco site. I don't know the main idea for solve this problem. I know, is base in eulerian graph, but i don't see how solve it. Thank you for the help.
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All you need to do is implement the algorithm to find a eulerian tour/circuit. The algorithm is described on this page in the USACO training pages, which you should have already read...
thank you for the help, i understand now!!!