实现并行计算面积问题，并行计算多线程问题，研究生一年级大作业实现多线程处理实验。(To achieve parallel computing area problem, parallel computing multi-threaded problem, Graduate freshman homework to achieve multi-threaded processing experiments.)

能够通过多线程实现查找算法，大大节省了计算时间，提高了程序效率(Ability to implement a lookup algorithm through multiple threads)