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  1. #include <iostream>
  2. #include <vector>
  3. #include <unordered_map>
  4. #include <bits/stdc++.h>
  5.  
  6. using namespace std;
  7.  
  8. #define saleh ios_base::sync_with_stdio(false); cin.tie(nullptr);
  9. #define ll long long
  10. vector<int> adj[100004];
  11. bool vis[100004];
  12. int n, m;
  13. unordered_map<int, unordered_map<int, int>> w;
  14.  
  15. void dfs(int u, int ltr) {
  16.     if (vis[u]) return;
  17.     vis[u] = true;
  18.     for (int &v : adj[u]) {
  19.         if (!vis[v] && w[u][v] <= ltr) {
  20.             dfs(v, ltr);
  21.         }
  22.     }
  23. }
  24.  
  25. bool good(int md) {
  26.     dfs(1, md);
  27.     bool can = true;
  28.     for (int i = 1; i <= n; i++) {
  29.         if (!vis[i]) can = false;
  30.         vis[i] = false;  
  31.     }
  32.     return can;
  33. }
  34.  
  35. void solve() {
  36.     cin >> n >> m;
  37.     for (int i = 0; i < m; i++) {
  38.         int x, y, z;
  39.         cin >> x >> y >> z;
  40.         adj[x].push_back(y);
  41.         adj[y].push_back(x);
  42.         w[x][y] = z;
  43.         w[y][x] = z;
  44.     }
  45.  
  46.     int l = 1, r = 100000;
  47.     while (l <= r) {
  48.         int mid = (r + l) / 2;
  49.         if (good(mid)) r = mid - 1;
  50.         else l = mid + 1;
  51.     }
  52.  
  53.     cout << l << '\n';
  54.  
  55.     for (int i = 1; i <= n; i++) {
  56.         adj[i].clear();  
  57.     }
  58. }
  59.  
  60. int main() {
  61.     saleh;
  62.     int t;
  63.     cin >> t;
  64.     while (t--) {
  65.         solve();
  66.     }
  67. }
  68.  
Success #stdin #stdout 0.02s 5900KB
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https://ideone.com/2okOk8
language:
C++ (gcc 8.3)
created:
1 day ago
visibility:
public

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