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#define se second #define fi first #define mp make_pair #define pb push_back typedef long long ll; typedef long double ld; using namespace std; vector
p, w; int get_root(int x) { if (p[x] == x) return x; return p[x] = get_root(p[x]); } bool is_equal(int x, int y) { return get_root(x) == get_root(y); } void unite(int x, int y) { x = get_root(x); y = get_root(y); if (w[x] > w[y]) swap(x, y); p[x] = y; w[y] += w[x]; } int main() { int n, m; cin >> n >> m; vector
>> a; ///{вес ребра, {x, y}} for (int i = 0; i < m; i++) { int x, y, w; cin >> x >> y >> w; x--, y--; a.push_back({w, {x, y}}); } sort(a.begin(), a.end()); vector
> ostov; int answ = 0; p.resize(n); for (int i = 0; i < n; i++) { p[i] = i; } w.assign(n, 1); for (auto e : a) { if (!is_equal(e.se.fi, e.se.se)) { answ += e.fi; ostov.push_back(e.se); unite(e.se.fi, e.se.se); } } cout << answ << '\n'; for (auto e : ostov) { cout << e.fi + 1 << ' ' << e.se + 1 << '\n'; } return 0; }
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