4838122_ac_32ms_308k.cpp

来自「部分PKU上的源码」· C++ 代码 · 共 22 行

#include<iostream>
#include<iomanip>
using namespace std;
int main()
{
	int n,i,j,k;
	double first,last,sum,result;
	double c[5000];
	cin>>n;
	cin>>first;
	cin>>last;
	for(i=1;i<=n;i++)
		cin>>c[i];
	sum=0;
	result=0.0;
	for(k=1;k<=n;k++)
		for(j=1;j<=k;j++)
		sum+=c[j];
	result=(double)(last+first*n-2*sum)/(double)(n+1);
	printf("%.2lf\n",result);
	return 0;
}