Problem1230--成绩考核1230: 成绩考核
Time Limit: 1 Sec Memory Limit: 128 MB
Submit: 2378 Solved: 1022
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学生期末考试3门课的平均成绩大于或者等于90, 则为等级A
大于等于70, 则为等级B
大于等于50, 则为等级C
小于50, 等级F
Input
92 93.5 91
Output
A
Sample Input
90 90.1 90.2
Sample Output
A
Source/Category
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