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- #include <fstream>
- #include <algorithm>
- using namespace std;
- ifstream in("nrtri1.in");
- ofstream out("nrtri1.out");
- int v[6001];
- int main()
- {
- int n,i,cate=0,k,j;
- in>>n;
- for(i=1; i<=n; i++)
- in>>v[i];
- sort(v+1,v+n+1);
- for(i=1; i<=n; i++)
- {
- k=n;
- for(j=1; j<i; j++)
- {
- while(v[k]>v[i]+v[j]&&k>i)
- k--;
- cate+=k-i;
- }
- }
- out<<cate;
- return 0;
- }
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