Typically, when an algorithm is associated with processing information, data are read from an input source or device, written to an output sink or device, and/or stored for further processing.

• 演算法是指完成一个任务所需要的具体步骤和方法。也就是说给定初始状态或输入数据，经过电脑程序的有限次运算，能够得出所要求或期望的终止状态或输出数据。