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  1. #include<bits/stdc++.h>
  2.  
  3. #define ll long long
  4. #define pp push_back
  5. #define endl '\n'
  6. #define all(x) x.begin(),x.end()
  7. #define ld long double
  8. #define PI acos(-1)
  9. #define ones(x) __builtin_popcountll(x)
  10. //#define int ll
  11.  
  12. using namespace std;
  13.  
  14. void Drakon() {
  15.     ios_base::sync_with_stdio(false);
  16.     cin.tie(nullptr);
  17.     cout.tie(nullptr);
  18. #ifdef Clion
  19.     freopen("input.txt", "r", stdin), freopen("output.txt", "w", stdout);
  20. #endif
  21. }
  22.  
  23. unsigned long long inf = 1e10;
  24. const double EPS = 1e-6;
  25. const int MOD = 1000000007, N = 1e5 + 5, LOG = 25;
  26.  
  27. ll mul(const ll &a, const ll &b) {
  28.     return (a % MOD + MOD) * (b % MOD + MOD) % MOD;
  29. }
  30.  
  31. ll add(const ll &a, const ll &b) {
  32.     return (a + b + 2 * MOD) % MOD;
  33. }
  34.  
  35. ll pw(ll x, ll y) {
  36.     ll ret = 1;
  37.     while (y > 0) {
  38.         if (y % 2 == 0) {
  39.             x = mul(x, x);
  40.             y = y / 2;
  41.         } else {
  42.             ret = mul(ret, x);
  43.             y = y - 1;
  44.         }
  45.     }
  46.     return ret;
  47. }
  48.  
  49. vector<int> adj[N];
  50. bool vis[N];
  51. int cnt;
  52.  
  53. void dfs(int u) {
  54.     vis[u] = true;
  55.     for(auto v : adj[u]) if(!vis[v]) dfs(v);
  56. }
  57.  
  58. void solve() {
  59.     int n, m, k;
  60.     cin >> n >> m >> k;
  61.     for (int i = 0; i < m; ++i) {
  62.         int u, v;
  63.         cin >> u >> v;
  64.         u--, v--;
  65.         adj[u].push_back(v);
  66.         adj[v].push_back(u);
  67.     }
  68.     for (int i = 0; i < n; ++i) {
  69.         if(vis[i]) continue;
  70.         dfs(i);
  71.         cnt ++;
  72.     }
  73.     if(cnt >= k) cout << "YES";
  74.     else cout << "NO";
  75. }
  76.  
  77. signed main() {
  78.     Drakon();
  79.     int t = 1;
  80.     //cin >> t;
  81.     while (t--) {
  82.         solve();
  83.     }
  84. }
Success #stdin #stdout 0.01s 6056KB
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https://ideone.com/eeUatu
language:
C++14 (gcc 8.3)
created:
4 days ago
visibility:
public

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