Submission #418578

#	Time	Username	Problem	Language	Result	Execution time	Memory
418578		Berted	Senior Postmen (BOI14_postmen)	C++14	55 / 100	503 ms	71528 KiB

postmen

#include <iostream>
#include <vector>

#define pii pair<int, int>
#define fst first
#define snd second

using namespace std;

const int INF = 1e9;

int N, M, H[500001];
vector<pii> adj[500001];

bool used[500001];

int DFS(int u)
{
	while (adj[u].size())
	{
		int v = adj[u].back().fst, id = adj[u].back().snd; adj[u].pop_back();
		if (used[id]) continue;

		used[id] = 1;
		if (H[v] < H[u])
		{
			cout << u + 1 << " "; 
			H[u] = INF;
			return H[v];
		}

		H[v] = H[u] + 1;
		int ret = DFS(v);
		if (ret < H[u])
		{
			cout << u + 1 << " ";
			H[u] = INF; 
			return ret;
		}

		if (ret == H[u]) {cout << u + 1 << "\n";}
	}

	H[u] = INF;
	return INF;
}

int main()
{
	cin.tie(0) -> sync_with_stdio(0);
	cin >> N >> M;
	for (int i = 0; i < N; i++) H[i] = INF;
	for (int i = 0; i < M; i++)
	{
		int u, v; cin >> u >> v;
		adj[u - 1].push_back({v - 1, i});
		adj[v - 1].push_back({u - 1, i});
	}
	for (int i = 0; i < N; i++)
	{
		if (adj[i].size()) {H[i] = 0; DFS(i);}
	}
	return 0;
}

• Subtask 1: 38 / 38
• Subtask 2: 17 / 17
• Subtask 3: 0 / 45