4838654_wa.cpp

来自「部分PKU上的源码」· C++ 代码 · 共 28 行

#include<iostream>
using namespace std;

int main()
{
	int a1=3,a2=11;
	int a3=a2*3+a1*2+2;//6
	int a4=a3*3+a2*2+a1*2+2;   //8
	int a5=(a4)*3+(a3+a2+a1)*2+2;  //10
	int a6=(a5)*3+(a4+a3+a2+a1)*2+2;  //12
	int a[31];
    a[2]=3;a[4]=11;
	int s=a[2];
	for(int i=6;i<=30;i=i+2)
	{
		a[i]=a[i-2]*3+s*2+2;
		s=s+a[i-2];
	}
	int n;
	cin>>n;
	while(n!=-1)
	{
		cout<<a[n]<<endl;
		cin>>n;
		
	}
	return 1;
}