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#include <bits/stdc++.h>

#include <iostream>

using namespace std;

int main(){

//program to merge intervals.

int n;

cin>>n;

int arr[n][2];

for(int i=0;i<n;i++){

cin>>arr[i][0]>>arr[i][1];

}

sort(arr, arr + n);

int b = arr[0][0];

int e = arr[0][1];

vector<vector<int>> ans;

for(int i=1;i<n;i++){

if(e>=arr[i][0]){

e = max(arr[i][1], e);

}else{

vector<int> temp;

temp.push_back(b);

temp.push_back(e);

ans.push_back(temp);

}

}

vector<int> temp;

temp.push_back(b);

temp.push_back(e);

ans.push_back(temp);

return 0;

}