铺瓷砖

斐波那契。。。

#include<iostream>
using namespace std;

const int N = 20;

int f[N][N];
int n;

int main(){
    cin >> n;
    
    f[0][0] = f[1][1] = 1;
    
    for(int i = 2; i <= n; i ++)
        for(int j = 1; j <= n; j ++)
            f[i][j] = f[i - 1][j - 1] + f[i - 2][j - 1];
            
    int res = 0;
    for(int i = 0; i <= n; i ++) res += f[n][i];
    
    cout << res;
}

铺瓷砖

原文：https://www.cnblogs.com/tomori/p/13672041.html