Submission #875391

#	Time	Username	Problem	Language	Result	Execution time	Memory
875391		BvoJa	Railway (BOI17_railway)	C++11	0 / 100	24 ms	2500 KiB

railway

/**
  　　　　　／＞　 フ
  　　　　　| 　_　 _|
  　 　　　／`ミ _x 彡
  　　 　 /　　　 　 |
  　　　 /　  ヽ　　 |
  　／￣|　　 |　|　|
  　| (￣ヽ＿_ヽ_)_)
  　＼二つ

 **/

#include<bits/stdc++.h>
#define ll long long
#define pii pair<int, int>
#define fi first
#define se second
#define ALL(v) v.begin(), v.end()
#define pb push_back
#define MP make_pair
#define MT make_tuple
#define typeT tuple<ll, int, int>
#define FOR(i, a, b) for (int i = (a), _b = (b); i <= _b; i++)
#define FOD(i, a, b) for (int i = (a), _b = (b); i >= _b; i--)
#define MASK(i) (1LL << (i))
#define BIT(k, i) (((k) >> (i)) & 1)
const int N = 1e5 + 5;

using namespace std;
int n, m, k;
int cnt[N];

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
#define task "a"
   // freopen(task".inp", "r", stdin);
    //freopen(task".out", "w", stdout);

    cin >> n >> m >> k;
    FOR(i, 1, n - 1) {
        int u, v; cin >> u >> v;
    }
    FOR(i, 1, m) {
        int s; cin >> s;
        FOR(j, 1, s) {
            int x; cin >> x;
            cnt[x]++;
        }
    }

    int res = 0;
    FOR(i, 1, n - 1) if (cnt[i] >= k) res++;
    cout << res << "\n";
    FOR(i, 1, n - 1) if (cnt[i] >= k) cout << i << " ";
    
    return 0;
}

• Subtask 1: 0 / 8
• Subtask 2: 0 / 15
• Subtask 3: 0 / 7
• Subtask 4: 0 / 29
• Subtask 5: 0 / 16
• Subtask 6: 0 / 25