补充了 0099.岛屿的数量广搜.md 中原有java代码中缺少的pair类的定义;提供了另一种不使用pair,而是使用两个队列分别存储横纵坐标的方案 #2912
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1、完善了 0099.岛屿的数量广搜.md 中原有java代码中缺少的pair类的定义
2、提供了另一种不使用pair,而是使用两个队列分别存储横纵坐标的方案