5.18

代码说明：

  编写程序定义一个vector对象，其每个元素都是指向string类型的指针，读取该vector对象，输出每个string的内容及其相应的长度。(Write a program to define a vector object, which each element is a pointer pointing to the string type, reads the vector object, the output of each string and the corresponding length.)