剑指OFFER 斐波那契数列

剑指OFFER 斐波那契数列

class Solution {
public:
    int Fibonacci(int n) {
        int n1 = 1;
        int res = 1;
        if(n == 0)return 0;
        if(n == 1)return 1;
        if(n == 2)return 1;
        for(int i=0;i<n-2;i++)
        {
            int t = n1 + res;
            n1 = res;
            res = t;
        }
        return res;
    }
};