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Cod sursa(job #307579)
#include<fstream>
using namespace std;
const int N=100002;
int main()
{
ifstream in("teams.in");
ofstream out("teams.out");
int n,a,b,v[N],i,k,j,l,w,x;
in>>n;
in>>a>>b;
j=0;
for(i=1;i<=n;i++)
{
in>>x;
if (x<b) {
j++;
v[j]=x;
}
}
w=0;
for(k=1;k<=j;k++)
{
//for(l=1;l<k;l++) if((v[l]+v[k])<=b && (v[l]+v[k])>=a) w++;
for(l=k+1;l<=j;l++) if((v[l]+v[k])<=b && (v[l]+v[k])>=a) w++;
}
out<<w; in.close();
out.close();
return 0;
}