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Cod sursa(job #223810)
#include<stdio.h>
#include<string.h>
int v[801];
int tri(int a,int b,int c)
{
if(a&&b&&c)
if((a<=c && b<=c && a+c>=c)||(a<=b && c<=b && a+c>=b)||(b<=a && c<=a && b+c>=a))
return true;
return false;
}
int main()
{
int v[801],N,m=0,a=0,b=0,c=0,z=0;
freopen("nrtri.in","r",stdin);
freopen("nrtri.out","w",stdout);
scanf("%d",&N);
for(;m<N;m++)
scanf("%d",&v[m]);
for(;a<N;a++)
for(b=a+1;b<N;b++)
for(c=b+1;c<N;c++)
if(a!=b && a!=c && b!=c && tri(v[a],v[b],v[c])==true)
++z;
printf("%d\n",z);
return 0;
}