Submission #1027952

#	Time	Username	Problem	Language	Result	Execution time	Memory
1027952		anarch_y	Senior Postmen (BOI14_postmen)	C++17	100 / 100	308 ms	65344 KiB

postmen

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define all(x) begin(x), end(x)
#define sz(x) (int)x.size()
#define pb push_back
 
const int maxn = 500001;
vector<pair<int, int>> adj[maxn];
vector<bool> seen;
vector<int> path;
 
void dfs(int s){
    while(!adj[s].empty()){
        auto [u, id] = adj[s].back();
        adj[s].pop_back();
        if(seen[id]) continue;
        seen[id] = true;
        dfs(u);
    }
    path.pb(s);
}
 
int main(){
    ios::sync_with_stdio(0);
    cin.tie(0);
 
    int n, m; cin >> n >> m;
    seen.resize(m+1);
    for(int i=1; i<=m; i++){
        int a, b; cin >> a >> b;
        adj[a].pb({b, i}); adj[b].pb({a, i});
    }
    dfs(1);
    reverse(all(path));
    int v[n+1] = {};
    vector<int> w;
    for(auto s: path){
        if(v[s]){
            cout << s << ' ';
            while(w.back() != s){
                auto t = w.back();
                w.pop_back();
                v[t] = 0;
                cout << t << ' ';
            }
            cout << "\n";
        }
        else{
            v[s] = 1;
            w.pb(s);
        }
    }
}

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