UNABLE TO UNDERSTAND THE OPERATOR

#1

Sir for A.age<B.age.Output should be persons having lesser age the highest priority.But its coming out to be age in descending order.
#include
#include
#include
using namespace std;

class Person
{
public:

string name;
int age;
  
  Person()
  {
      
  }

  Person(string a,int b)
  {
      name=a;
      age=b;
  }

};

class PersonCompare
{
public:

  bool operator()(Person A,Person B)
  {
      return A.age<B.age;
  }

};

int main()
{
int n;
cin>>n;

priority_queue<Person,vector,PersonCompare> pq;

for(int i=0;i<n;i++)
{
string name;
int age;
cin>>name>>age;
Person p(name,age);
pq.push§;
}

int k=3;
for(int i=0;i<k;i++)
{
Person p=pq.top();
cout<<p.name<<" "<<p.age<<endl;
pq.pop();
}
}

#2

@Mukul-Shane-1247687648773500 no that will come with a.age > b.age

#3

Sir for a.age<b.age it is giving the top most person with highest age instead of lowest age.

#4

@Mukul-Shane-1247687648773500 no it will give that only for increasing order u need to change it to >

#5

#include #include #include using namespace std; class Person { public: string name; int age; Person() { } Person(string a,int b) { name=a; age=b; } }; class PersonCompare { public: bool operator()(Person A,Person B) { return A.age>B.age; } }; int main() { int n; cin>>n; priority_queue<Person,vector,PersonCompare> pq; for(int i=0;i<n;i++) { string name; int age; cin>>name>>age; Person p(name,age); pq.push§; } cout<<endl; int k=3; for(int i=0;i<k;i++) { Person p=pq.top(); cout<<p.name<<" "<<p.age<<endl; pq.pop(); } }

#6

// input 5 a 30 b 9 c 60 d 5 e 78 // output d 5 b 9 a 30

#7

Sir for greater than output is in ascending order.Please check it.

#8

hi @Mukul-Shane-1247687648773500 please share the code in ide.codingblocks.com

#9
#10

hi @Mukul-Shane-1247687648773500 no that doent work this way
refer
https://www.geeksforgeeks.org/comparator-class-in-c-with-examples/#:~:text=The%20comparator%20class%20compares%20the,%2C%20otherwise%2C%20it%20returns%20false.

#11

Sir here also harsh it has lowest roll num and therefore his name comes out on top for <.But for my code its coming in descending order.

#12

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