304. Find A Queue That Moves


304. There were six lines in the supermarket. Five shoppers stood silently in five lines. Three shoppers stood silently in the sixth line. Bob went to the sixth line. The old man in the front of the line was talking to the cashier. The cashier nodded her head. Then she said, "Price check!" She stood there holding a can of peas. A little bit later, a coworker came by. The coworker grabbed the can of peas and went to the canned goods section. Bob backed out of the line. He went to another line. The cashier took all the money out of the cash register. She started counting the 20‐dollar bills. Another cashier stood nearby, waiting to start her shift. Bob backed out of that line. He went to another line. The cashier saw him get in the back of the line. "I'm sorry, sir," she said. "This line is closed." 2.3

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