qq_38690917的博客

getline(cin,line)读取一行字符串给linegetline(cin,line,'a')读取到字符a就停止<cstring>strlen()字符串长度strcmp()字符串比较strcpy()字符串拷贝memset(int *a，0，sizeof(a))暴力清空memcpy(b,a,size)暴力拷贝<cmath>floor(double x)不大于x的最大整数<cstdlib>qsort()C语言快排rand(