题解 | #跳台阶#空间O(1) 时间O(n)

public class Solution {
    public int jumpFloor(int target) {
        int res = 1,p = 1,q = 1;
        for(int i = 2;i <= target;i++) {
            res = p + q;
            p = q;
            q = res;
        }
        return res;
    }
}