# 力扣721. 账户合并


## 力扣721. Accounts Merge（账户合并）

合并相同用户的账户。

示例 1：

![](../posts/01_学习/87_LeetCode/0721_账户合并/img/0721-1-description.png)

```
输入：accounts = [["John","johnsmith@mail.com","john00@mail.com"],["John","johnnybravo@mail.com"],["John","johnsmith@mail.com","john_newyork@mail.com"],["Mary","mary@mail.com"]]
输出：[["John","john00@mail.com","john_newyork@mail.com","johnsmith@mail.com"],["John","johnnybravo@mail.com"],["Mary","mary@mail.com"]]
解释：...
```

提示：
- 1 <= accounts.length <= 1000
- 2 <= accounts[i].length <= 10
- 1 <= accounts[i][j].length <= 30