• Source 
    1. #include <iostream>
    2. #include <algorithm>
    3. #include <vector>
    4. using namespace std;
    5. int main() 
    6. {
    7. 	int n;
    8. 	cin>>n;
    9. 	vector< pair< int, int > > a;
    10. 	for(int i = 0; i < n; ++i){
    11. 		int x,y;
    12. 		cin>>x>>y;
    13. 		a.push_back( make_pair(x+y,i+1));
    14. 	}
    15. 	sort(a.begin(), a.end());
    16. 	for(int  i = 0; i < n; ++i){
    17. 		cout<<a[i].second<<" ";
    18. 	}
    19. 	// your code goes here
    20. 	return 0;
    21. }