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@ -304,3 +304,15 @@ Step 2: 输入删除学号
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Step 3: if 不成立则结束 else 删除
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```
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
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### sort_data
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```
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Step 1: for 0 to num_part-1 排序
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Step 2: 按学生学号从小到大排序
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```
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
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### make_chart
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```
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Step 1: Step 1: for 0 to num_part-1 图表
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Step 2: 以图表方式显示库存记录
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```
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
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