This results in breadth-first traversal (compared to digging down into the first link found, which would result in depth-first behavior).
这会产生广度优先遍历（与优先处理首先找到的第一个链接不同，后者是一种深度优先遍历）。
Connectivity to the map without the depth and breadth - first traversal.
实现连通无向图的深度和广度优先遍历。
Connectivity to the map without the depth and breadth - first traversal.
实现连通无向图的深度和广度优先遍历。
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