func_code_string: #include <bits/stdc++.h>   /** #include <ext/pb_ds/assoc_container.hpp>    * #include <ext/pb_ds/tree_policy.hpp>    * using namespace __gnu_pbds; */   using namespace std;      #define ll long long   #define ull unsigned long long   #define f(a, b) for (ll i = a; i < b; i++)   #define mod 1000000007   #define pb push_back   #define vll vector<ll>   #define pll vector<pair<ll, ll>>   #define ld long double   #define fr(a, b) for (ll j = a; j >= b; j--)   #define fi(a, b) for (ll j = a; j < b; j++)   #define fii(a, b) for (ll k = a; k < b; k++)   /** typedef tree<ll    * ,null_type,less<ll>,rb_tree_tag,tree_order_statistics_node_update>    * ordered_set; */      template <class T> ostream &operator<<(ostream &os, vector<T> V) {     os <<  [  ;     for (auto v : V)       os << v <<    ;     os <<  ] ;     return os;   }   template <class T> ostream &operator<<(ostream &os, set<T> S) {     os <<  {  ;     for (auto s : S)       os << s <<    ;     return os <<  } ;   }   template <class L, class R> ostream &operator<<(ostream &os, map<L, R> M) {     os <<  {  ;     for (auto m : M)       os <<  (  << m.first <<  :  << m.second <<  )  ;     return os <<  } ;   }   template <class L, class R> ostream &operator<<(ostream &os, pair<L, R> P) {     return os <<  (  << P.first <<  ,  << P.second <<  ) ;   }      const ll N = 200005;   vll adj[N];   ll n, color[N], parent[N], cycle_end, cycle_start, ans;   bool C[N];      bool dfs(ll v, ll par) {     color[v] = 1;     for (ll u : adj[v]) {       if (u == par)         continue;       if (color[u] == 0) {         parent[u] = v;         if (dfs(u, parent[u]))           return true;       } else if (color[u] == 1) {         cycle_end = v;         cycle_start = u;         return true;       }     }     color[v] = 2;     return false;   }      ll DFS(ll x, ll pr) {     ll k = 1;     f(0, adj[x].size()) {       if (adj[x][i] != pr)         k += DFS(adj[x][i], x);     }     return k;   }      void solve() {     cycle_start = -1;     for (int v = 1; v <= n; v++) {       if (color[v] == 0 && dfs(v, parent[v]))         break;     }     vector<int> cycle;     C[cycle_start] = 1;     cycle.push_back(cycle_start);     for (int v = cycle_end; v != cycle_start; v = parent[v])       cycle.push_back(v), C[v] = 1;     vll V;     f(0, cycle.size()) {       ll v = cycle[i];       ll tot = 0;       fi(0, adj[v].size()) {         if (!C[adj[v][j]]) {           tot += DFS(adj[v][j], v);         }       }       V.pb(tot);     }     ll l = cycle.size();     ans += l * (l - 1);     f(0, V.size()) {       ll k = V[i];       ans += k * (l - 1) * 2 + k;       ans += k * (k - 1) / 2;     }     ll sum = 0;     f(0, V.size()) sum += V[i];     f(0, V.size()) {       sum -= V[i];       ans += V[i] * sum * 2;     }   }      int main() {   #ifndef ONLINE_JUDGE     freopen( input.txt ,  rt , stdin);     freopen( output.txt ,  wt , stdout);   #endif     ios_base::sync_with_stdio(false);     cin.tie(NULL);        ll t;     cin >> t;     while (t--) {       cin >> n;       ans = 0;       f(1, n + 1) adj[i].clear(), color[i] = 0, parent[i] = -1, C[i] = false;       f(0, n) {         ll x, y;         cin >> x >> y;         adj[x].pb(y);         adj[y].pb(x);       }       solve();       cout << ans <<   n ;     }      #ifndef ONLINE_JUDGE     cout <<   nTime Elapsed :   << 1000 * (ld)clock() / (ld)CLOCKS_PER_SEC          <<   ms n ;   #endif     return 0;   }