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public cpp v1 · immutable#include<iostream>#include<vector>#include<algorithm>#include<string>#include<math.h>using namespace std;long long prob5(int n);int main(){ int vount=prob5(4); cout<<endl<<vount; getchar(); return 0;}long long prob5(int n){ long long vount=(pow(3,n)+1)/2; return vount; }