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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,143 @@ | ||
| //#include <iostream> | ||
| //#include <queue> | ||
| //#include <vector> | ||
| // | ||
| //using namespace std; | ||
| // | ||
| //int N, M, K, X, a, b, minDist; | ||
| //deque<deque<int>> town; | ||
| //queue<int> q; | ||
| //vector<int> dist; | ||
| //vector<int> answer; | ||
| // | ||
| //void Solve() | ||
| //{ | ||
| // cin >> N >> M >> K >> X; | ||
| // N++; | ||
| // town.assign(N, deque<int>()); | ||
| // dist.assign(N, -1); | ||
| // | ||
| // for (int i = 0; i < M; i++) | ||
| // { | ||
| // cin >> a >> b; | ||
| // | ||
| // town[a].push_back(b); | ||
| // } | ||
| // | ||
| // minDist = -1; | ||
| // q.push(X); | ||
| // dist[X] = 0; | ||
| // | ||
| // while (!q.empty()) | ||
| // { | ||
| // int cur = q.front(); | ||
| // q.pop(); | ||
| // | ||
| // for (const int& val : town[cur]) | ||
| // { | ||
| // if (dist[val] != -1) continue; | ||
| // q.push(val); | ||
| // dist[val] = dist[cur] + 1; | ||
| // minDist = max(minDist, dist[val]); | ||
| // } | ||
| // } | ||
| // | ||
| // for (int i = 0; i < dist.size(); i++) | ||
| // { | ||
| // if (dist[i] == K) answer.push_back(i); | ||
| // } | ||
| // | ||
| // if (answer.size()) | ||
| // { | ||
| // for (const int& val : answer) | ||
| // { | ||
| // cout << val << "\n"; | ||
| // } | ||
| // } | ||
| // else cout << -1; | ||
| //} | ||
| // | ||
| //int main() | ||
| //{ | ||
| // cin.tie(nullptr); | ||
| // ios::sync_with_stdio(false); | ||
| // | ||
| // Solve(); | ||
| // | ||
| // return 0; | ||
| //} | ||
|
|
||
| #include <iostream> | ||
| #include <queue> | ||
| #include <vector> | ||
|
|
||
| using namespace std; | ||
|
|
||
| int N, M, K, X, A, B; | ||
| int cur, dist; | ||
| queue<pair<int, int>> q; | ||
| vector<vector<int>> towns; | ||
| vector<bool> visited; | ||
| priority_queue<int, vector<int>, greater<int>> answer; | ||
|
|
||
| void Solve() | ||
| { | ||
| cin >> N >> M >> K >> X; | ||
|
|
||
| N++; | ||
| towns.assign(N, vector<int>()); | ||
| visited.assign(N, false); | ||
|
|
||
| while (M--) | ||
| { | ||
| cin >> A >> B; | ||
| towns[A].push_back(B); | ||
| } | ||
|
|
||
| q.push({ X, 0 }); | ||
| visited[X] = true; | ||
|
|
||
| while (!q.empty()) | ||
| { | ||
| cur = q.front().first; | ||
| dist = q.front().second; | ||
|
|
||
| q.pop(); | ||
|
|
||
| if (dist == K) | ||
| { | ||
| answer.push(cur); | ||
| continue; | ||
| } | ||
|
|
||
| for (auto v : towns[cur]) | ||
| { | ||
| if (visited[v]) continue; | ||
| q.push({ v, dist + 1 }); | ||
| visited[v] = true; | ||
| } | ||
| } | ||
|
|
||
| if (answer.empty()) | ||
| { | ||
| cout << -1; | ||
| return; | ||
| } | ||
|
|
||
| while (!answer.empty()) | ||
| { | ||
| cout << answer.top() << "\n"; | ||
| answer.pop(); | ||
| } | ||
| return; | ||
| } | ||
|
|
||
| int main() | ||
| { | ||
| cin.tie(nullptr); | ||
| ios::sync_with_stdio(false); | ||
|
|
||
| Solve(); | ||
|
|
||
| return 0; | ||
| } |
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