Submission #1124876

#	Time	Username	Problem	Language	Result	Execution time	Memory
1124876		TahirAliyev	Senior Postmen (BOI14_postmen)	C++20	100 / 100	390 ms	60708 KiB

postmen

#include <bits/stdc++.h>

// #pragma GCC optimize("Ofast,no-stack-protector,unroll-loops")
// #pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
// #define int long long
#define ld long double
#define ll long long
#define pii pair<int, int>
#define all(v) v.begin(), v.end()
using namespace std;
const int oo = 1e9 + 9;
const int MAX = 5e5 + 6, LOGMAX = 20, B = 400, MOD = 1e9 + 7;

int n, m;
vector<pii> g[MAX];
int vis[MAX];
vector<int> path;

void dfs(int node){
    while(g[node].size()){
        auto to = g[node].back();
        g[node].pop_back();
        if(vis[to.second]) continue;
        vis[to.second] = 1;
        dfs(to.first);
    }
    path.push_back(node);
}

void solve(){
    cin >> n >> m;
    for(int i = 1; i <= m; i++){
        int u, v; cin >> u >> v;
        g[u].push_back({v, i});
        g[v].push_back({u, i});
    }
    dfs(1);
    memset(vis, 0, sizeof(vis)); 
    vector<int> cur;
    for(int &a : path){
        if(vis[a]){
            while(cur.size()){
                cout << cur.back() << ' ';
                vis[cur.back()] = 0;
                if(cur.back() == a){
                    cur.pop_back();
                    break;
                }
                cur.pop_back();
            }
            cout << '\n';
        }
        cur.push_back(a);
        vis[a] = 1;
    }
}   

signed main(){
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int t = 1;
    // cin >> t;
    while(t--) solve();
}

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