标签：pre algo iostream pac ret std turn logs cst
#include<iostream> #include<cstdio> #include<cstdlib> #include<cmath> #include<algorithm> #include<cstring> using namespace std; int main() {double a; cin>>a; printf("%0.12lf",a); return 0; }
标签：pre algo iostream pac ret std turn logs cst
原文地址：http://www.cnblogs.com/oi-forever/p/7337196.html
