in this when a.age>b.age is done then younger ones are coming above according to oldest should come first.
Regarding person compare class
Here when a.age>b.age is used…then it would form a min heap based on age. That is younger one would be at the top of the heap. When a.age<b.age is used…then a max heap is formed. Try to remember this.
You can refer this and check.
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