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统计学生成绩 已知n个学生的注册号和成绩,计算他们的平均成绩,并列出成绩最好的前t名学生的注册号和分数。-The software is used to stastic the student grade. For given n students, it caculates the average grade with given student ID and grade and list the best student ID and grade for t out of n .