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Cod sursa(job #209116)
#include<stdio.h>
int n, v[900];
int main(){
freopen("nrtri.in", "r", stdin);
freopen("nrtri.out", "w", stdout);
int q, w, e, s=0;
scanf("%d", &n);
for(int i=1; i<=n; ++i){
scanf("%d", &v[i]);}
int c;
for(int i=1; i<n; ++i){
int min=i;
for(int j=i+1; j<=n; ++j)
if(v[min]>v[j])
min=j;
if(min!=i){
c=v[i];
v[i]=v[min];
v[min]=c;
}
}
for(q=1;q<=n-2;++q)
for(w=q+1;w<=n-1;++w){
for(e=w+1;e<=n;++e)
if(v[q]+v[w]>=v[e])
s++;
}
printf("%d", s);
return 0;
}