[1,1,-3,-1,-1] gives false but [1,-1,-3,-1,-1] gives true?

  • 0

    in case1: [1,1,-3,-1,-1], a valid loop may be a2 -> a4 -> a3 -> a2
    in case2: [1,-1,-3,-1,-1], the valid loop is the same with case2

    is there sth. wrong about my understanding?

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