题解 | #跳台阶# | Rust

struct Solution{

}

impl Solution {
    fn new() -> Self {
        Solution{}
    }

    /**
    * 代码中的类名、方法名、参数名已经指定，请勿修改，直接返回方法规定的值即可
    *
    * 
        * @param number int整型 
        * @return int整型
    */
    pub fn jumpFloor(&self, number: i32) -> i32 {
        if number <= 2 {
            return number;
        }
        let (mut one_step, mut two_step) = (2, 1);
        for i in 3..number+1 {
            let now = one_step + two_step;
            two_step = one_step;
            one_step = now;
        }
        return one_step;
    }
}