func_code_string: #include <bits/stdc++.h>   using namespace std;   using ll = long long;   using lpair = pair<ll, ll>;   const ll MOD = 1e9 + 7;   const ll INF = 8e18;   void print() {}   template <class H, class... T>   void print(H&& h, T&&... t) {     cout << h <<    n [sizeof...(t) == 0];     print(forward<T>(t)...);   }   int main() {     cin.tie(0);     ios::sync_with_stdio(false);     ll t;     cin >> t;     while (t--) {       ll nr, ng, nb;       cin >> nr >> ng >> nb;       vector<ll> r(nr), g(ng), b(nb);       for (ll i = (0); i < (nr); i++) cin >> r[i];       for (ll i = (0); i < (ng); i++) cin >> g[i];       for (ll i = (0); i < (nb); i++) cin >> b[i];       sort(r.begin(), r.end());       sort(g.begin(), g.end());       sort(b.begin(), b.end());       ll ans = INF;       vector<lpair> lp;       for (ll i = (0); i < (nr); i++) {         lp.push_back({r[i], 0});       }       for (ll i = (0); i < (ng); i++) {         lp.push_back({g[i], 1});       }       for (ll i = (0); i < (nb); i++) {         lp.push_back({b[i], 2});       }       sort(lp.begin(), lp.end());       vector<ll> pr, pg, pb;       for (ll i = (0); i < (nr + ng + nb); i++) {         if (lp[i].second == 0) {           pr.push_back(i);         } else if (lp[i].second == 1) {           pg.push_back(i);         } else {           pb.push_back(i);         }       }       for (ll i = (1); i < (nr + ng + nb - 1); i++) {         if (lp[i].second == 0) {           ll val_g = -1, val_b = -1;           ll pos = lower_bound(pg.begin(), pg.end(), i) - pg.begin();           if (pos != 0) {             val_g = g[pos - 1];           }           pos = lower_bound(pb.begin(), pb.end(), i) - pb.begin();           if (pos != nb) {             val_b = b[pos];           }           if (val_g != -1 && val_b != -1) {             ll val_r = lp[i].first;             ll res = (val_r - val_g) * (val_r - val_g) +                      (val_r - val_b) * (val_r - val_b) +                      (val_b - val_g) * (val_b - val_g);             ans = min(ans, res);           }           val_b = -1, val_g = -1;           pos = lower_bound(pb.begin(), pb.end(), i) - pb.begin();           if (pos != 0) {             val_b = b[pos - 1];           }           pos = lower_bound(pg.begin(), pg.end(), i) - pg.begin();           if (pos != ng) {             val_g = g[pos];           }           if (val_g != -1 && val_b != -1) {             ll val_r = lp[i].first;             ll res = (val_r - val_g) * (val_r - val_g) +                      (val_r - val_b) * (val_r - val_b) +                      (val_b - val_g) * (val_b - val_g);             ans = min(ans, res);           }         } else if (lp[i].second == 1) {           ll val_r = -1, val_b = -1;           ll pos = lower_bound(pr.begin(), pr.end(), i) - pr.begin();           if (pos != 0) {             val_r = r[pos - 1];           }           pos = lower_bound(pb.begin(), pb.end(), i) - pb.begin();           if (pos != nb) {             val_b = b[pos];           }           if (val_r != -1 && val_b != -1) {             ll val_g = lp[i].first;             ll res = (val_r - val_g) * (val_r - val_g) +                      (val_r - val_b) * (val_r - val_b) +                      (val_b - val_g) * (val_b - val_g);             ans = min(ans, res);           }           val_r = -1, val_b = -1;           pos = lower_bound(pb.begin(), pb.end(), i) - pb.begin();           if (pos != 0) {             val_b = b[pos - 1];           }           pos = lower_bound(pr.begin(), pr.end(), i) - pr.begin();           if (pos != nr) {             val_r = r[pos];           }           if (val_r != -1 && val_b != -1) {             ll val_g = lp[i].first;             ll res = (val_r - val_g) * (val_r - val_g) +                      (val_r - val_b) * (val_r - val_b) +                      (val_b - val_g) * (val_b - val_g);             ans = min(ans, res);           }         } else {           ll val_r = -1, val_g = -1;           ll pos = lower_bound(pr.begin(), pr.end(), i) - pr.begin();           if (pos != 0) {             val_r = r[pos - 1];           }           pos = lower_bound(pg.begin(), pg.end(), i) - pg.begin();           if (pos != ng) {             val_g = g[pos];           }           if (val_r != -1 && val_g != -1) {             ll val_b = lp[i].first;             ll res = (val_r - val_g) * (val_r - val_g) +                      (val_r - val_b) * (val_r - val_b) +                      (val_b - val_g) * (val_b - val_g);             ans = min(ans, res);           }           val_g = -1, val_r = -1;           pos = lower_bound(pg.begin(), pg.end(), i) - pg.begin();           if (pos != 0) {             val_g = g[pos - 1];           }           pos = lower_bound(pr.begin(), pr.end(), i) - pr.begin();           if (pos != nr) {             val_r = r[pos];           }           if (val_r != -1 && val_g != -1) {             ll val_b = lp[i].first;             ll res = (val_r - val_g) * (val_r - val_g) +                      (val_r - val_b) * (val_r - val_b) +                      (val_b - val_g) * (val_b - val_g);             ans = min(ans, res);           }         }       }       print(ans);     }   }   