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       >>     Thanks! :)   <<
    
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    I didn't know it was so difficult to use spaces here :(

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    Hi,
    Maybe a visual display of the queue and the tills will be helpful :

    Q          T = 2         Sum

    1    -->   1 | 10 | 6 | 17

    2    -->   2 | 4 | 5 | 11

    10

    4

    5

    6

    At the end:

    T1 contains : 1 | 10 | 6      T1sum = 17

    T2 contains : 2 | 4 | 5      T2sum = 11

    Maybe somthing like that and emphasizing on the part that only empty q will get new customer will help
    Maybe integrating the notes after Edit: in the details will help too

    I hope that had been helpful

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