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- #include <iostream>
- #include <vector>
- #include <set>
- #include <cstring>
- #include <queue>
- using namespace std;
- const int maxn = 1e5 + 10;
- int idx[maxn], sz[maxn];
- int find_root(int x) {
- while(idx[x] != x) {
- idx[x] = idx[idx[x]];
- x = idx[x];
- }
- return x;
- }
- bool is_in_the_same_union(int a, int b) {
- if(find_root(a) == find_root(b)) {
- return true;
- }
- return false;
- }
- void union_two_elems(int a, int b) {
- int root_a = find_root(a);
- int root_b = find_root(b);
- if(root_a != root_b) {
- if(sz[root_a] < sz[root_b]) {
- sz[root_b] += sz[root_a];
- idx[root_a] = idx[root_b];
- }
- else {
- sz[root_a] += sz[root_b];
- idx[root_b] = idx[root_a];
- }
- }
- }
- int main() {
- for(int i = 0; i < maxn; i++) {
- sz[i] = 1;
- idx[i] = i;
- }
- int n, m;
- cin >> n >> m;
- vector<pair<int, pair<int, int> > > graph;
- for(int i = 0; i < m; i++) {
- int a, b, c;
- cin >> a >> b >> c;
- graph.push_back(make_pair(c, make_pair(a, b)));
- }
- sort(graph.begin(), graph.end());
- int MST = 0;
- for(int i = 0; i < m; i++) {
- int c = graph[i].first;
- int a = graph[i].second.first;
- int b = graph[i].second.second;
- if(!is_in_the_same_union(a, b)) {
- union_two_elems(a, b);
- cout << a << " " << b << endl;
- MST += c;
- }
- }
- cout << MST << endl;
- return 0;
- }
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