Submission #1160370

#	Time	Username	Problem	Language	Result	Execution time	Memory
1160370		Ludissey	Senior Postmen (BOI14_postmen)	C++20	38 / 100	1096 ms	12000 KiB

postmen

#include <bits/stdc++.h>
#define sz(a) (int)a.size()
#define all(a) a.begin(), a.end()
#define rall(a) a.rbegin(), a.rend()
#define int long long
using namespace std;

vector<vector<pair<int,int>>> neigh;
vector<int> circuit;
vector<bool> edvisit;


signed main() {
    ios_base::sync_with_stdio(false); cin.tie(nullptr);
    int n,m; cin >> n >> m;    
    neigh.resize(n);
    edvisit.resize(m);
    for (int i = 0; i < m; i++)
    {
        int u,v; cin >> u >> v; u--; v--;
        neigh[u].push_back({v,i});
        neigh[v].push_back({u,i});
    }

    stack<int> path;
    int u=0;
    while(true){
        bool b=false;
        for (auto v : neigh[u])
        {
            if(edvisit[v.second]) continue;
            b=true;
            edvisit[v.second]=true;
            path.push(u);
            u=v.first;
            break;
        }
        if(b) { continue; }
        circuit.push_back(u);
        if(path.empty()) break;
        u=path.top();
        path.pop();
    }

    vector<vector<int>> out;
    vector<int> visited(n);
    stack<int> q;
    for (int i = 0; i < sz(circuit); i++)
    {  
        if(visited[circuit[i]]){
            out.push_back({circuit[i]});
            while(!q.empty()&&q.top()!=circuit[i]){
                out.back().push_back(q.top());
                visited[q.top()]=false;
                q.pop();
            }
            out.back().push_back(circuit[i]);
        }else{
            q.push(circuit[i]);
            visited[circuit[i]]=true;
        }
    }

    for (int i = 0; i < sz(out); i++)
    {
        for (int j = 0; j < sz(out[i])-1; j++) cout << out[i][j]+1 << " ";
        cout << "\n";
    }
    
    return 0;
}

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