题目内容
单选题 A vertex in a digraph has four arcs entering and three arcs leaving. The outdegree of the vertex is ().
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单选题 A vertex in a digraph has 2 arcs entering and 3 arcs leaving. The degree of the vertex is ().
单选题 A (n) ____list is also known as a queue.
单选题 A (n) ____ list is also known as a stack.
单选题 If A is the first data element input into a stack followed by B, C, and D, （ ）is the first element to be removed.
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