#include <iostream> #include <cmath> using namespace std; #define m 1000000007 int main() { int h,n,i,p; long long *a; // for dymnamic creation of array cin>>h; while(h) { n=pow(2,h); // i have calculated till 2^h because i will fill my array from position 1 not 0 a=new long long [n]; for(i=1;i<n;i++) cin>>a[i]; i=n-1; while(i>1) { p=int(i/2); // calculating index of parent node a[2*p]>a[2*p +1]?a[p]=a[p]*a[2*p] :a[p]=a[p]*a[2*p +1]; i=i-2; } cout<<a[1]%m<<endl; cin>>h; } return 0; }
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