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Cod sursa(job #179900)
#include<stdio.h>
int main()
{
int n,v[800];
int i,j,k,t,gata;
freopen("nrtri.in","r",stdin);
freopen("nrtri.out","w",stdout);
scanf("%d",&n);
for(i=0;i<n;i++)
scanf("%d",&v[i]);
do{
gata=1;
for(i=0;i<n-1;i++)
if(v[i]>v[i+1])
{
t=v[i];
v[i]=v[i+1];
v[i+1]=t;
gata=0;
}
}while(!gata);
t=0;
for(i=0;i<n-2;i++)
for(j=i+1;j<n-1;j++)
for(k=j+1;k<n;k++)
if(v[i]+v[j]>=v[k])
t++;
else
break;
printf("%d",t);
return 0;
}