题解 | #统计每个月兔子的总数#

#include <iostream>
using namespace std;

int Rabbits(int n);

int main()
{
    int day, sum, a = 1, b = 1;
    cin >> day;
    if (day == 1 || day == 2)
        sum = 1;
    else
    {
        for (int i = 3; i <= day; i++) // 从第三个开始
        {
            sum = a + b;
            a = b; // 顺序不要反了
            b = sum;
        }
    }
    cout << sum << endl;
    return 0;
}