func_code_string: #include<bits/stdc++.h>   using namespace std;   typedef long long int ll;         void solve()   {       ll n; cin>>n;       vector<ll> v;       for(int i=0;i<n;i++)       {           ll x; cin>>x;           v.push_back(x);       }       sort(v.begin(),v.end());       ll cost=0;       for(ll i=2; i<n; ++i)       {           ll j=lower_bound(v.begin(),v.end(),v[i]-2)-v.begin();           ll x=(i-j);           cost+=(x*(x-1))/2;       }cout<<cost<<  n ;   }                int main()       {   int t;   cin>>t;   while(t--)   {      solve();       }        }