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Discussion of Problem 1441. From the History of Gringotts Bank

HINT
Posted by hoan 3 Jan 2011 23:27
if your algo use euleraen tour and also add edge to the graph, note that the edge can be over that 20000.
this test is good:
20000 19999
1 2
1 3
1 4
.
.
.
1 20000

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