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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".