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search: add comments to tsearch_avl.c
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#include <stdlib.h>
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#include <search.h>
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/*
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avl tree implementation using recursive functions
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the height of an n node tree is less than 1.44*log2(n+2)-1
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(so the max recursion depth in case of a tree with 2^32 nodes is 45)
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*/
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struct node {
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const void *key;
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struct node *left;
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