Concept of Activity 一个app从不同地方打开，可能在不同位置，比如Email app，从social media app打开...

1. 两个list的nodes，searched and unsearched 2. start from a source node. 3. ...

XOR: ^ this bit is 1 when they are different, otherwise it is 0. Differe...

详解Kahn算法和DFS： https://blog.csdn.net/dm_vincent/article/details/7714519 经...

算法中两种graph的表达方式： Adjacency matrices &Adjacency lists: https://www.khanac...