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A tree is a graph in which there is exactly one path between any two nodes. It is often used as a hierarchical data structure.

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Binary tree (S-Expression) pretty printer

void print(Tree * tree, bool isRoot) { if (! … tree->isNode) { printf("%lu", tree->leaf); return; }; printf("("); print(tree->node.left, false); printf(" "); print(tree->node.right, false); printf(")"); …
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