```
public class Solution
extends Object
```
279 - Perfect Squares\. Medium Given an integer `n`, return _the least number of perfect square numbers that sum to_ `n`. A **perfect square** is an integer that is the square of an integer; in other words, it is the product of some integer with itself. For example, `1`, `4`, `9`, and `16` are perfect squares while `3` and `11` are not. **Example 1:** **Input:** n = 12 **Output:** 3 **Explanation:** 12 = 4 + 4 + 4. **Example 2:** **Input:** n = 13 **Output:** 2 **Explanation:** 13 = 4 + 9. **Constraints:** * 1 <= n <= 10⁴

Class Solution