随机产生若干组长度各异的待排序列（乱序的和有序的），分别用快速排序算法和改进的枢轴元素三者取中算法对待排序列进行排序，当待排子序列长度已小于 20时，改用直接插入排序，利用时间函数验证三者取中算法在效率上的提高。(Leader of randomly generated different number of columns to be sorted (out of order and orderly), respectively, with fast sorting algorithm and improved pivot element takes three sorting algorithms treat sort columns, when the sequence length has to be ranked When less than 20, use direct insertion sort, utilizing a function of time taken to verify the three algorithms increase in efficiency.)