Description

P1: 'Trace: enqueue(A), enqueue(B), enqueue(C), dequeue(), dequeue()' → dequeue returns ___, then ___ [A, B] (FIFO!). P2: 'Implement is_empty' → def is_empty(self): return len(self.items) == ___ [0]. P3: 'Queue using two stacks' → def dequeue(self): while not self.stack1.is_empty(): self.stack2.push

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