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- #include<bits/stdc++.h>
- using namespace std;
- int main()
- {
- long long n;
- cin>>n;
- long long ar[n];
- for(int i=0;i<n;i++){
- cin>>ar[i];
- }
- for(int i=n-1,j=0;i>=0;i--,j++){
- ar[i]=ar[j];
- }
- ///reverse(&ar[0],&ar[n]);
- int sum=0;
- for(int i=n-1,j=0;i>=0;i--,j++){
- sum+=(ar[i]*pow(2,j));
- }
- cout<<sum<<endl;
- }
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