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  • Please add full code and line in which error occurs Commented Mar 15, 2019 at 15:41
  • I have added full code. Please help me. Commented Mar 16, 2019 at 3:13
  • What does A stands for? Commented Mar 16, 2019 at 10:26
  • A is the adjacency matrix of the graph. Commented Mar 16, 2019 at 11:13