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Tuesday common C++ interview problem: Serialize and de-serialize an n-ary tree.

Each node stores a uint32_t value and a vector of weak pointers to children.

To add nodes to a tree, use the add_node method.

Solve it yourself: https://compiler-explorer.com/z/M6Mx9qxfn
Solution: https://compiler-explorer.com/z/h5Kbe4avY