标签:class style net += long ring name detail std
//递推 //见https://blog.csdn.net/accelerator_/article/details/9636923 #include <iostream> #include <cstdio> #include <cstring> #include <string> #include <cmath> #include <cctype> #include <algorithm> #include <sstream> #define EPS 1e-6 using namespace std; int main(){ long long n,x; double a0,an1,c[3001],s; cin>>x; while (x--) { s=0; cin>>n>>a0>>an1; for(int i=1;i<=n;i++) cin>>c[i]; for(int i=0;i<n;i++){ s+=c[i+1]*(n-i); } double aa=(an1-2*s+n*a0)/(n+1); printf("%.2f\n",aa); if(x!=0) printf("\n"); } return 0; }
标签:class style net += long ring name detail std
原文地址:https://www.cnblogs.com/MorrowWind/p/13056310.html