样例输出 8 #include<bits/stdc++.h>/C++的万能头文件 using namespace std; int main() unsigned int n1; long long n2; cin >n1 n2 pow(2,n1); cout <<n2 <<endl; return 0;样例输出 8 #include <bits/stdc++.h> //C++的万能头文件 using namespace std; int main() { unsigned int n1; long long n2; cin >> n1 ; n2 = pow(2,n1); cout <<n2 <<endl; return 0; }