Talent brute- O(f*N)

#include <fstream>
using namespace std;
int s[10010],f[10010],a[10010],b[10010],i,n,nr,k,talent,fmin,smin,x;
int main()
{
    ifstream fi("talent.in");
    ofstream fo("talent.out");
    fi>>n;
    smin=int(2e9); fmin=0;
    for(i=1;i<=n;i++)
    {
      fi>>s[i]>>f[i]>>a[i]>>b[i];
      if(smin>s[i]) smin=s[i];
      if(fmin<f[i]) fmin=f[i];
    }
    for(nr=smin;nr<=fmin;nr++)
    {
      k=0;
      for(i=1;i<=n;i++)
      if(nr<=f[i] and nr>=s[i])
      {
        x=(nr-s[i])%(a[i]+b[i]);
        if(x<a[i]) k++;
      }
      if(k%2) talent=nr;
    }
    fo<<talent<<"\n";
    return 0;
}