明明想在学校中请一些同学一起做一项问卷调查，为了实验的客观性，他先用计算机生成了N个1到1000之间的随机整数（N≤1000），对于其中重复的数字，只保留一个，把其余相同的数去掉，不同的数对应着不同的学生的学号。然后再把这些数从小到大排序，按照排好的顺序去找同学做调查。请你协助明明完成“去重”与“排序”的工作。(I want to ask some students to do a questionnaire in the school. For the objective of the experiment, he first generated a random integer between 1 and 1000 N (N < 1000) with a computer. For the repeated numbers, only one is retained and the rest of the same number is removed. Different numbers correspond to different student numbers. Then, rank these numbers from small to large, and do a survey in accordance with the order. Please help me to finish the work of "de heavy" and "sorting".)