C12 COPP

#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <map>
#include <iterator>

using namespace std;

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

    map<int, int> list;

    for(int i = 0; i < n; i ++) {
        int a, b;
        cin >> a >> b;
       list[a] = b;
    }

    for(auto iter = list.begin(); iter != list.end(); iter++) {
        cout << iter->first << " " << iter->second << endl;
    }


   return 0;
}