Submission #1260733

#	Time	Username	Problem	Language	Result	Execution time	Memory
1260733		chikien2009	Senior Postmen (BOI14_postmen)	C++20	100 / 100	190 ms	73244 KiB

postmen

#include <bits/stdc++.h>

using namespace std;

void setup()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
}

int n, m, a, b;
bool check[500000], mark[500000];
vector<pair<int, int>> g[500000];
vector<int> v;

inline void DFS(int node)
{
    if (check[node])
    {
        while (!v.empty() && check[node])
        {
            cout << v.back() + 1 << " ";
            check[v.back()] = false;
            v.pop_back();
        }
        cout << "\n";
    }
    while (!g[node].empty())
    {
        a = g[node].back().first;
        b = g[node].back().second;
        g[node].pop_back();
        if (!mark[b])
        {
            mark[b] = check[node] = true;
            v.push_back(node);
            DFS(a);
        }
    }
}

int main()
{
    setup();

    cin >> n >> m;
    for (int i = 0; i < m; ++i)
    {
        cin >> a >> b;
        g[a - 1].push_back({b - 1, i});
        g[b - 1].push_back({a - 1, i});
    }
    DFS(0);
    return 0;
}

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