# 1 week
bugs.vn/io/RVIIp
# Text
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#include <iostream>
using namespace std;

int TimSoNguyen(int &n)

int DeQuy(int a[], int n)
{
int sum=a[n];
if (n<=0)
{
return 0;
}
else 
{
if(TimSoNguyen==1)
return sum+DeQuy(a,n-1);
else
return sum+DeQuy(a,n-2);
return