pub struct Solution;
剑指 Offer 10- I. 斐波那契数列 https://leetcode.cn/problems/fei-bo-na-qi-shu-lie-lcof/
TypeId
self
Returns the argument unchanged.
Calls U::from(self).
U::from(self)
That is, this conversion is whatever the implementation of From<T> for U chooses to do.
From<T> for U