Discussion @ 1280. Topological Sorting @ Timus Online Judge

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Discussion of Problem 1280. Topological Sorting

Phan Hoài Nam - Đại học Ngoại ngữ Tin Học TP.HCM WA#13 ! Please pay attention... // Problem 1280. Topological Sorting 13 Jun 2009 15:35

for example test :
2 2
1 2
2 1
1 2
the answer is NO, not YES