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Cod sursa(job #958006)
#include<fstream>
using namespace std;
if stream f("nrtri.in");
of stream g("nrtri.out");
int n,x[801];
int main()
{ f>>n;
for(int i=i;i<=n;i++) f>>x[i];
int nr=0;
for(int i=1;i<=n-2;i++)
for(int j=i+1;j<=n-1;j++)
for(int k=j+1;k<=n;k++)
if(x[i]<=x[j]+x[k]&&x[j]<=x[k]+x[i]&&x[k]<=x[i]+x[j])
nr++;
g<<nr<<"\n";
g.close();
return 0;
}