#include<cmath>
#include<queue>
#include<utility>
#include<algorithm>
#include<sys/time.h>
using namespace std;
#define MAX 100000

bool compare(pair<int,int> p1,pair<int,int> p2) {

    if(p1.second < p2.second)
        return 1;
    else if(p1.second > p2.second)
        return 0;
    if(p1.first <= p2.first)
        return 1;
    else
        return 0;
}

int main() {
    int n = 35000;

    vector< pair<int,int> > p(n);
    for(int i=0;i<n;i++)
     { p[i] = make_pair(0,0); };

    sort(p.begin(),p.begin()+n,compare);

    //for(int i=0;i<n;i++)
        //printf("%d %d\n",p[i].first,p[i].second);
        printf("%.6f\n",(p[n-1].second+p[n-2].second)/(20.0+p[n-1].first+p[n-2].first));

    return 0;
}

/usr/local/lib/gcc/i686-pc-linux-gnu/4.1.2/../../../../include/c++/4.1.2/debug/safe_iterator.h:181:
    error: attempt to dereference a past-the-end iterator.

Objects involved in the operation:
iterator "this" @ 0x0xbfae71d8 {
type = N11__gnu_debug14_Safe_iteratorIN9__gnu_cxx17__normal_iteratorIPSt4pairIiiEN10__gnu_norm6vectorIS4_SaIS4_EEEEEN15__gnu_debug_def6vectorIS4_S8_EEEE (mutable iterator);
  state = past-the-end;
  references sequence with type `N15__gnu_debug_def6vectorISt4pairIiiESaIS2_EEE' @ 0x0xbfae71d8
}

Disallowed system call: SYS_kill