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# 0473. Matchsticks to Square

<https://leetcode.com/problems/matchsticks-to-square>

## Description

You are given an integer array `matchsticks` where `matchsticks[i]` is the length of the `ith` matchstick. You want to use **all the matchsticks** to make one square. You **should not break** any stick, but you can link them up, and each matchstick must be used **exactly one time**.

Return `true` if you can make this square and `false` otherwise.

**Example 1:**

![](https://assets.leetcode.com/uploads/2021/04/09/matchsticks1-grid.jpg)

```
**Input:** matchsticks = [1,1,2,2,2]
**Output:** true
**Explanation:** You can form a square with length 2, one side of the square came two sticks with length 1.
```

**Example 2:**

```
**Input:** matchsticks = [3,3,3,3,4]
**Output:** false
**Explanation:** You cannot find a way to form a square with all the matchsticks.
```

**Constraints:**

* `1 <= matchsticks.length <= 15`
* `1 <= matchsticks[i] <= 108`

## ac

```java
```