hdu 2046 骨牌铺方格

#include <iostream>using namespace std;int main(){    int n;    long long num[51] = {0,1,2};    for(int i=3;i<51;i++)    {        num[i] = num[i-1]+num[i-2];    }    while(cin>>n)    {        cout<<num[n]<<endl;    }    return 0;}