codeforces problemset

1140D
*dp *greedy *math

Author: iamdeepanshutaneja

Practice/Codeforces/Minimum Triangulation-1140D.cpp

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+//Problem Link : https://codeforces.com/problemset/problem/1140/D
+
+#include<bits/stdc++.h>
+using namespace std;
+typedef long long ll;
+int main()
+{
+	ll n,w=0,i;
+	cin>>n;
+	for(i=3;i<=n;i++)
+	w=w+(i*(i-1));
+	cout<<w;
+	return 0;
+}