学习博客:https://www.cnblogs.com/Miracevin/p/10774831.html #include<bits/stdc++.h> typedef double db; // https://www.luogu.com.cn/problem/P4525 db a,b,c,d,l,r; inline db readb() { int f=1;db x=0;char s=getchar(); for( ;!isdigit(s);s=='-' && (f=-1),s=getchar()); for( ;isd...