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Bank teller service issues: bank teller is responsible for the n-th customer service, the customer enters the bank to take a number and wait for call number. When a teller idle down, and called the next number. Programming the issue, P, V synchronization teller operations and customers. Implementation requires a number can only be achieved by a customer can not have more than one teller called the same number has a customer when the teller called number without teller idle time, the customer need to wait without the customer' s time, the teller need to wait. Test text test file composed by a number of records, record fields separated by a space. Record first field is the customer number, the second field is the time a customer enters the bank, and the third field is the time the customer needs the service. Output requirements for each customer need output into the bank' s time to begin serving time, leaving the bank teller time and service number.