#include <iostream>
#include <algorithm>
using namespace std;

bool compare(int a, int b){
    if( a > b ){
        return true;
    }
    else {
        return false;
    }
}

typedef struct{
  bool operator() (int i,int j) { return (i<j);}
}Mystruct;


class MyClass{
public:
    bool operator()(int a, int b){
        return (a>b);
    }
};


int main(){
    int array[] = {5, 3, 1, 2, 4};

// default:    small to large
    sort(array, array+5);
    for( int i = 0 ; i < 5 ; i++ ){
        cout << array[i] << " ";
    }
    cout << endl << endl;

// customed function: large to small
    sort(array, array+5, compare);
    for( int i = 0 ; i < 5 ; i++ ){
        cout << array[i] << " ";
    }
    cout << endl << endl;


// customed object(struct): small to large
    Mystruct myobject;
    sort(array, array+5, myobject);
    for( int i = 0 ; i < 5 ; i++ ){
        cout << array[i] << " ";
    }
    cout << endl << endl;

// customed object(class): small to large
    MyClass myobject2;
    sort(array, array+5, myobject2);
    for( int i = 0 ; i < 5 ; i++ ){
        cout << array[i] << " ";
    }
    cout << endl << endl;


    return 0;
}