• 1517 Fat Mouse Trade

    时间限制 : 2000/1000 MS(Java/Others) | 内存限制 : 65536/32768 KB(Java/Others)

    提交数 : 4207 | 通过数 : 666

    题目描述

    FatMouse prepared M pounds of cat food, ready to trade with the cats guarding the warehouse containing his favorite food, JavaBean. The warehouse has N rooms. The i-th room contains J[i] pounds of JavaBeans and requires F[i] pounds of cat food. FatMouse does not have to trade for all the JavaBeans in the room, instead, he may get J[i]* a% pounds of JavaBeans if he pays F[i]* a% pounds of cat food. Here a is a real number. Now he is assigning this homework to you: tell him the maximum amount of JavaBeans he can obtain.

    输入要求

    The input consists of multiple test cases. Each test case begins with a line containing two non-negative integers M and N. Then N lines follow, each contains two non-negative integers J[i] and F[i] respectively. The last test case is followed by two -1's. All integers are not greater than 1000.

    输出要求

    For each test case, print in a single line a real number accurate up to 3 decimal places, which is the maximum amount of JavaBeans that FatMouse can obtain.

    输入样例

    5 3
    7 2
    4 3
    5 2
    -1 -1
    

    输出样例

    13.333
    

    提示

    结合结构体,会使处理过程更简洁:)

    <=1000


    来源

    Zhejiang Provincial Programming Contest 2004

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