Let's say you want a lookuptable that will return square roots of Numbers between 5 and 20. A simple program can be written to generate such a table like this.
假设我们希望得到这样一个查找表：它返回5到20之间各个数字的平方根。
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Dynamic look-up table, binary tree using dynamic lookuptable, is very useful for beginners, a program that can help him learn good dynamic look-up table data structure!