#include #include #include #include #include #include #include #include using std::cin; using std::cout; const char endl = '\n'; const int N = 1e5 + 5, M = 3e5 + 5; int n, m, a[N + M]; long long res, ans = std::numeric_limits::max(); std::tuple edges[M]; bool vis[M]; class LinkCutTree { private: struct node { size_t lchild, rchild, father; int max1, max2; bool reversed; node() : lchild(0), rchild(0), father(0), max1(0), max2(0), reversed(false) {} size_t& child(const unsigned& x) { return !x ? lchild : rchild; } } tr[N + M]; void pushup(const size_t& u) { tr[u].max1 = a[u]; if (tr[u].max1 < tr[tr[u].lchild].max1) { tr[u].max2 = tr[u].max1; tr[u].max1 = tr[tr[u].lchild].max1; } else if (tr[u].max1 > tr[tr[u].lchild].max1) { tr[u].max2 = std::max(tr[u].max2, tr[tr[u].lchild].max1); } if (tr[u].max1 < tr[tr[u].rchild].max1) { tr[u].max2 = tr[u].max1; tr[u].max1 = tr[tr[u].rchild].max1; } else if (tr[u].max1 > tr[tr[u].rchild].max1) { tr[u].max2 = std::max(tr[u].max2, tr[tr[u].rchild].max1); } tr[u].max2 = std::max({tr[u].max2, tr[tr[u].lchild].max2, tr[tr[u].rchild].max2}); } void pushdown(const size_t& u) { if (!tr[u].reversed) return; std::swap(tr[u].lchild, tr[u].rchild); tr[tr[u].lchild].reversed = !tr[tr[u].lchild].reversed; tr[tr[u].rchild].reversed = !tr[tr[u].rchild].reversed; tr[u].reversed = false; } bool relation(const size_t& u) { return u == tr[tr[u].father].lchild ? 0 : 1; } bool is_root(const size_t& u) { return tr[tr[u].father].lchild != u && tr[tr[u].father].rchild != u; } void rotate(const size_t& u) { size_t p = tr[u].father; bool x = relation(u); if (!is_root(p)) tr[tr[p].father].child(relation(p)) = u; tr[u].father = tr[p].father; if (tr[u].child(x ^ 1)) tr[tr[u].child(x ^ 1)].father = p; tr[p].child(x) = tr[u].child(x ^ 1); tr[u].child(x ^ 1) = p; tr[p].father = u; pushup(p); pushup(u); } void splay(size_t u) { std::stack st; size_t cur = u; st.emplace(cur); while (!is_root(cur)) { st.emplace(tr[cur].father); cur = tr[cur].father; } while (!st.empty()) { pushdown(st.top()); st.pop(); } while (!is_root(u)) { if (is_root(tr[u].father)) { rotate(u); } else if (relation(u) == relation(tr[u].father)) { rotate(tr[u].father); rotate(u); } else { rotate(u); rotate(u); } } } void access(size_t u) { for (size_t f = 0; u; u = tr[f = u].father) { splay(u); tr[u].rchild = f; pushup(u); } } void make_root(const size_t& u) { access(u); splay(u); tr[u].reversed = !tr[u].reversed; } size_t find_root(size_t u) { access(u); splay(u); while (tr[u].lchild) { u = tr[u].lchild; } return u; } void split(const size_t& x, const size_t& y) { make_root(x); access(y); splay(y); } public: bool check(const int& x, const int& y) { return find_root(x) == find_root(y); } std::pair query(const int& x, const int& y) { split(x, y); return {tr[y].max1, tr[y].max2}; } void link(const int& x, const int& y) { make_root(x); if (find_root(y) != x) { tr[x].father = y; } } void cut(const int& x, const int& y) { split(x, y); if (tr[y].lchild == x) { tr[y].lchild = tr[x].father = 0; } } } lct; struct DSU : private std::vector { DSU(const int& _n) : std::vector(_n + 1) { std::iota(begin(), end(), 0); } int find(const int& x) { return x == at(x) ? x : at(x) = find(at(x)); } bool check(const int& x, const int& y) { return find(x) == find(y); } void merge(int x, int y) { x = find(x); y = find(y); if (x != y) at(x) = y; } }; int main() { std::ios::sync_with_stdio(false); cin.tie(nullptr); cin >> n >> m; for (int i = 1; i <= m; ++i) { int u, v, w; cin >> u >> v >> w; edges[i] = {u, v, w}; } std::sort(edges + 1, edges + m + 1, [](const std::tuple& a, const std::tuple& b) { return std::get<2>(a) < std::get<2>(b); }); DSU dsu(n); for (int i = 1; i <= m; i++) { int u = std::get<0>(edges[i]), v = std::get<1>(edges[i]), x = dsu.find(u), y = dsu.find(v), w = std::get<2>(edges[i]); a[n + i] = w; if (x != y) { dsu.merge(x, y); lct.link(u, i + n); lct.link(i + n, v); res += w; vis[i] = true; } } for (int i = 1; i <= m; i++) { if (vis[i]) continue; int u, v, w; std::tie(u, v, w) = edges[i]; if (u == v) continue; auto max = lct.query(u, v); if (w > max.first) { ans = std::min(ans, static_cast(w) - max.first); } else { ans = std::min(ans, static_cast(w) - max.second); } } cout << res + ans << endl; return 0; }