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Cod sursa(job #703276)
#include <fstream>
using namespace std;
ifstream f("nrtri.in");
ofstream g("nrtri.out");
int n,v[801],i,j,p,s=0,aux,a[30001];
int main()
{f>>n;
for(i=1;i<=n;i++)
f>>v[i];
for(i=1;i<=n-1;i++)
{
for(j=i+1;j<=n;j++)
{
if(v[j]<v[i])
{
aux=v[i];
v[i]=v[j];
v[j]=aux;
}
}
}
j=1;
for(i=1;i<=v[n];i++)
{a[i]=0;
while(v[j]==i)
{
a[i]++;
j++;
}
}
for(i=1;i<=n-1;i++)
{
for(j=i+1;j<=n;j++)
{p=v[j];
while(v[i]+v[j]>=p)
{
if(v[i]==p)
{s=s+a[p]-1;
g<<v[i]<<' '<<v[j]<<' '<<p<<endl;}
else
{
if(v[j]==p)
{s=s+a[p]-1;
g<<v[i]<<' '<<v[j]<<' '<<p<<endl;}
else
{s=s+a[p];
g<<v[i]<<' '<<v[j]<<' '<<p<<endl;}
}
p++;
}
}
}
g<<s;
return 0;
}