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Cod sursa(job #645723)
#include <fstream>
#include <algorithm>
using namespace std;
int e[1001],a,n,i,j,d=0,l;
int main()
{
ifstream q("nrtri.in");
ofstream w("nrtri.out");
q>>n;
for(i=1; i<=n; i++)
q>>e[i];
sort(e+1,e+n+1);
for(i=1; i<=n; i++)
for(l=i+1; l<=n; l++)
for(j=n; j>=l+1; j--)
if(e[j]<=e[i]+e[l])
{
d=d+(j-l);
break;
}
w<<d;
return 0;
}