Why must the answer be a level scan one and another?

  • 0

    The requirement of the problem is : It will automatically contact the police if two directly-linked houses were broken into on the same night.

    So consider the example as below:
    --8 - 1
    -1 1 1 9

    We can rob 8 & 9 without violating the rule since the two nodes are now not directly-linked. However, this is maximum but not got from odd levels' sum or even levels' sum. Could anyone help me about this?

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