/*
	sorting coordinates
	UNCOMMENT THE OPERATION YOU WANT TO PERFORM.....!
*/
#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
bool compare(pair<int,int> p,pair<int,int> q){
	// sort wrt y
	return p.second < q.second;	
}
int main() {
	// your code goes here
	vector<pair<int,int> > coordinates;
	coordinates.push_back(make_pair(1,3));
	coordinates.push_back(make_pair(3,4));
	coordinates.push_back(make_pair(2,1));
	// sorting wrt x
	//sort(coordinates.begin(),coordinates.end());
	// sort wrt y
	//sort(coordinates.begin(),coordinates.end(),compare);
	for(int i =0;i<coordinates.size();i++){
		cout << coordinates[i].first << " " << coordinates[i].second << endl;
	}
	return 0;
}

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