XOR Degree Graph

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MoEngage has given you an array $D$ of length $N$. Construct a graph with $N$ vertices such that: - The graph is connected and does not contain any parallel edges or self-loops; - Let $d_u$ be the [degree](https://en.wikipedia.org/wiki/Degree_(graph_theory)) of vertex $u$ (number of edges incident to $u$). Then, $d_u \le D_u$; - $\oplus_{i=1}^{N} d_i = 0$. In other words, the [bitwise XOR](https:

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solution.cppC++17

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