maopao是冒泡排序法，一种排序方法,重复地走访过要排序的数列，一次比较两个元素，如果他们的顺序错误就把他们交换过来。 -maopao is bubble sort, sort method, repeatedly visited the number of columns to be sorted, a comparison of the two elements, if they put them in the wrong order switching over.