A dictionary, also known as a symbolic table, associative array, or mapping, is an abstract data structure used to hold key-value pairs. In a dictionary, a key can be associated with a value, and these associated keys and values are called key-value pairs. The keys in a key-value pair are unique, a ... More >>

DFS(Depth first search)The following is a concrete example to understand. As shown in the figure, in a nine-box diagram, the green position represents the starting position, the red position represents the end position, the gray area and the border of the box diagram represents this road is not avai ... More >>