Discussion @ 1320. Graph Decomposition @ Timus Online Judge

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Discussion of Problem 1320. Graph Decomposition

Briana Banks a simple test [1] // Problem 1320. Graph Decomposition 24 Mar 2014 18:52

input

5 4
4 2
2 1
1 3
3 4

I think output should "1" but most of my colleagues' accepted programs print "0". Do I misunderstand the problem ?

This is not valid input because the graph has to have an even number of edges.