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introduction
Tools were invented to address the problem:
a. To calculate numbers in mathematics, humans invented the abacus.
b. In physics, to measure absolute values, humans have invented various rulers for measuring length, clocks for timing, scales and scales for weighing, and so on.
c. In chemistry, to measure the equivalent of a chemical reaction, humans have invented various scales.
In computer science, the relative size of the data is more important than the absolute value. Due to the requirements of the size of the data and some other requirements, an abstract data structure, the binary tree, is produced.
在计算机中，由于经常要做的事情是判断真假、比较大小、排序、挑选最大值这类的操作