pair descending order using sort function.

Pair_descending_order.cc

#include<iostream>
#include<algorithm>

using namespace std;

bool compare(const pair<int, int>& a, const pair<int, int>& b)
{
	//If the first number is same
	if (a.first == b.first)
		return a.second > b.second; //The second number in Descending order
	return a.first > b.first; //The first number of bigger numbers to move forward -> Descending order
}

int main()
{
	int N;
	pair<int,int> arr[1000];
	cin >> N;
	for (int i = 0; i < N; i++)
	{
		cin >> arr[i].first >> arr[i].second;
	}

	//Descending order
	sort(arr, arr + N, compare);

	//Print
	cout << endl;
	for (int i = 0; i < N; i++)
		cout << arr[i].first << " " << arr[i].second << endl;
	return 0;
}