OPENJUDGE 4017 爬楼梯

这就是个Fibonacci数列问题我会乱说？

# include <iostream>using namespace std;int Recursion(int level){if ( level == 0 ){return 1;}else if ( level < 0 ){return 0;}else return ( Recursion(level-1) + Recursion(level-2) );}int main(){int stairLevel = 0;int count = 0;while ( cin >> stairLevel ){count = Recursion(stairLevel);cout << count << endl;}return 0;}