题解 | #跳台阶扩展问题# | 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 jumpFloorII(&self, number: i32) -> i32 {
        let (mut prefix, mut ans) = (0 as i32, 0 as i32);
        for i in 0..number {
            ans = prefix + 1;
            prefix += ans;
        }
        return ans;
    }
}