Graph theory in discrete mathematics generally includes the basic concepts of graphs, graph connectivity, trees, and several special graphs. Graph theory is an important theory in discrete mathematics. Through this theory, two important concepts of graph and tree in data structure are given, which strengthens the situation of computer analysis and processing of linear structure objects; with the support of graph theory as the theoretical foundation , we usually use a tree to represent the source program grammatical structure in the compiler, resulting in two different parse trees: bottom-up and top-down
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