杭电oj训练赛第四场
Posted 一只特立独行的猫
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第一题：
题目大意就是需要给了t个函数f(x)，每个函数f(x)是多个F函数的相加，
判断s(x)是不是收敛的。
思路：
如果s(x)是收敛的，那么每一个f(j)都必须的极限都必须等于0。但是F函数的所有可选项的极限再C不为0时都不为0。所以直接判断所有C是否等于0即可。C++快速处理字符串可以看我这篇博客：
https://editor.csdn.net/md/?articleId=115360326.
第11题：
Sample Input
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