%d：用於int
%ld：用於long
%lld：用於longlong
%f：float
%lf：double
模擬退火篇： https://www.cnblogs.com/peng-ym/p/9158909.html https://blog.csdn.net/numberer/article/details/79996753 https://b
#include<cmath> #include<math.h> M_PI或者acos(-1)//兩種都可以
