正解： #include <bits/stdc++.h> using namespace std; int n,a[24]; int main() { cin >> n; a[1] = 1; for (int i = 2;i <= n;i++) { if (i%2 == 0) a[i] = a[i - 1] * 2; else a[i] = a[i - 1] + a[i - 2]; } cout << a[n]; return 0; }

#include<bits/stdc++.h> using namespace std; int main() { int n; cin>>n; int a[35]; a[1]=1; for(int i=2;i<=n;i++) { if(i%2==0){ a[i]=2*a[i-1]; }else{ a[i]=a[i-1]+a[i-2]; } } cout<<a[n]; return 0; }