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PRIORITY QUEUE (PQ)
A queue in which nodes can be added and deleted as per priority (Preference)
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Start_1
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Start_2
PQ1
PQ2
PQ3
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Start_3
PRIORITY QUEUE (PQ)
INSERTION in PQ
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Start_1
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Start_2
PQ1
PQ2
PQ3
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Start_3
PRIORITY QUEUE (PQ)
DELETION in PQ
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11 12
Start_1
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Start_2
PQ1
PQ2
PQ3
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Start_3

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