话很多说的题解

#include <bits/stdc++.h>
using namespace std;
int main(){
    int n = 0;
    long long a[1010];
    cin >> n;
    a[1] = 1;
    a[2] = 2;
    for(int i = 3;i <= n;i++){
        a[i] = a[i - 1] + a[i - 2]; 
    }
    cout << a[n];
    return 0;
}