2061 Treasure the new start, freshmen!

关键字: 代码分享 杭电100题


Problem Description


A new semester comes , and the HDU also meets its 50th birthday. No matter what's your major, the only thing I want to tell you is:"Treasure the college life and seize the time." Most people thought that the college life should be colorful, less presure.But in actual, the college life is also busy and rough. If you want to master the knowledge learned from the book, a great deal of leisure time should be spend on individual study and practise, especially on the latter one. I think the every one of you should take the learning attitude just as you have in senior school.

"No pain, No Gain", HDU also has scholarship, who can win it? That's mainly rely on the GPA(grade-point average) of the student had got. Now, I gonna tell you the rule, and your task is to program to caculate the GPA.

If there are K(K > 0) courses, the i-th course has the credit Ci, your score Si, then the result GPA is

GPA = (C1 * S1 + C2 * S2 +……+Ci * Si……) / (C1 + C2 + ……+ Ci……) (1 <= i <= K, Ci != 0)

If there is a 0 <= Si < 60, The GPA is always not existed.


The first number N indicate that there are N test cases(N <= 50). In each case, there is a number K (the total courses number), then K lines followed, each line would obey the format: Course-Name (Length <= 30) , Credits(<= 10), Score(<= 100).

Notice: There is no blank in the Course Name. All the Inputs are legal


Output the GPA of each case as discribed above, if the GPA is not existed, ouput:"Sorry!", else just output the GPA value which is rounded to the 2 digits after the decimal point. There is a blank line between two test cases.

Sample Input

Algorithm 3 97
DataStruct 3 90
softwareProject 4 85
Database 4 59
English 4 81

Sample Output




Problem Analyse


新的学期即将到来,也正逢杭州电子科技大学50周年校庆。无论你的专业是什么,我唯一要告诉你的是:“珍惜大学的生活,利用好时间。” 很多人认为大学的生活回是丰富多采。但事实是,大学生活也同样忙碌。如果你要掌握书上的知识,你的空闲时间必须花在自学和实践上,尤其是实践。我认为,作为一位大学生,所有人都必须端正自己的学习态度。

“没有不劳而获的事情”,杭电也设立了奖学金,你能得到吗?它主要依据是学生获得的GPA(测评平均分)。 现在,我将告诉你它的规则,你的任务就是编程计算GPA。


GPA = (C1 * S1 + C2 * S2 +……+Ci * Si……) / (C1 + C2 + ……+ Ci……) (1 <= i <= K, Ci != 0)



Algorithm Analyse



redraiment使用Emacs Lisp批量迁移《HDU 2060-2069》