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- #include<bits/stdc++.h>
- #define int long long
- using namespace std;
- main()
- {
- int t;
- const int var=1000000009+7;
- cin>>t;
- while(t--)
- {
- int sum=0,f=2,psum,n;
- cin>>n;
- int a[n+1];
- cin>>a[0]>>a[1];
- sum=(2*a[0]*a[1]);
- psum=2*(a[0]+a[1]);
- for(int i=2;i<=n;++i)
- {
- cin>>a[i];
- sum=((2*sum)%var+(psum*a[i])%var)%var;
- psum=psum+(f*a[i]);
- f*=2;
- }
- cout<<sum<<"\n";
- }
- }
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