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Cod sursa(job #720997)
#include<fstream>
#include<algorithm>
using namespace std;
ifstream f("nrtri.in");
ofstream g("nrtri.out");
int main()
{
int v[801], n,i,nr=0,k,j;
f>>n;
for(i=1;i<=n;i++)
f>>v[i];
sort(v+1,v+n+1);
for(i=1;i<n-1;i++)
for(j=i+1;j<n;j++)
for(k=j+1;k<=n;j++)
if(v[i]+v[j]>=v[k])
nr++;
else break;
g<<nr;
f.close();
g.close();
return 0;
}