leetcode

#include<iostream>
#include<vector>
using namespace std;
vector <int>memo;
class Solution {
public:

    int climbStairs(int n) {

        vector<int> data(n + 1, -1);
        data[0] = 1;
        data[1] = 1;
        for(int i = 2 ; i <= n ; i ++)
            data[i] = data[i - 1] + data[i - 2];
        return data[n];
    }
};
int   main()
{
    int n;
    while(cin>>n)
    {
        cout<<Solution().climbStairs(n)<<endl;
    }
    return 0;
}