Here is my Solution. As this problem is related to stable sort and there is  built in stable_sort function in c++ so it has become easier


#include <bits/stdc++.h>
using namespace std;
bool compare( const pair<long long int,long long int>& x, const pair<long long int, long long int>& y )
{

    return (x.second>y.second);

}
int main()
{
    vector<pair<long long int,long long int> >a;
    long long int n,i,j,b,c;
    cin>>n;
    for(i=1;i<=n;i++)
    {
        cin>>b>>c;
        a.push_back(pair<long long int,long long int>(b,c));
    }
    stable_sort(a.begin(),a.end(),compare); //must include stable_sort
    vector<pair<long long int,long long int> >::iterator p;
    for(p=a.begin();p!=a.end();p++)
    {
        cout<<p->first<<" "<<p->second<<endl;
    }
    return 0;



}

Edited by author 11.06.2016 01:55