c++流
https://blog.csdn.net/ouyangfushu/article/details/80779154
输入输出 getline(cin,str)
每次读取一行（包括空格） https://blog.csdn.net/henu1710252658/article/details/80173846
读取被空格分开的每一部分 https://blog.csdn.net/zdlnlhmj/article/details/79462770
string转int
https://blog.csdn.net/u010510020/article/details/73799996