题解 | 统计每个月兔子的总数

#include <iostream>
#include <vector>
using namespace std;

int main() {
    int n;
    cin >> n;  
    if(n < 3) {
        cout << 1 << endl;
        return 0;   
    }
    vector<int> rabbits(n + 1);
    rabbits[1] = 1;
    rabbits[2] = 1;
    for(int i = 3; i <= n; ++i) {
        rabbits[i] = rabbits[i-1] + rabbits[i-2];
    }
    cout << rabbits[n] << endl;
    return 0;
}