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today iamp;#39;m going to teach you depth first search depth first search or dfs is an algorithm for searching a graph as the name implies weamp;#39;ll use dfs to search a graph vertically before we proceed horizontally when you think of depth first search i want you to remember a stack as this is the data structure that keeps track of vertices weamp;#39;ll visit letamp;#39;s perform dfs on the following graph we want to know all the nodes that are discoverable from the root node a along the way weamp;#39;ll keep track of two things first nodes weamp;#39;ve visited will be colored black nodes that are in the stack that are in line to be visited will be colored gray starting our algorithm a is the first node weamp;#39;ll visit weamp;#39;ll keep track of the stack in the top left corner we pop a from the stack and mark it visited we also add its adjacent nodes into the stack iamp;#39;m adding the rightmost node first because i think itamp;#39;s easier
