Submission #1034665

#	Time	Username	Problem	Language	Result	Execution time	Memory
1034665		vjudge1	Senior Postmen (BOI14_postmen)	C++17	0 / 100	10 ms	23900 KiB

postmen

#include <bits/stdc++.h>
using namespace std;
 
#define ll long long
#define ld long double
#define pii pair<int, int>
#define pll pair<ll, ll>
#define pld pair<ld, ld>
#define pb push_back
#define fi first
#define se second
#define debug(x) cout << #x << " => " << x << endl
#define all(x) x.begin(),x.end()

set<int> adj[500010];
bool vis[500010];
stack<int> st;
int cnt=0;

void dfs(int u,int p)
{
	// debug(u);
	st.push(u);
	if(vis[u])
	{
		cout<<st.top()<<' ';
		st.pop();
		vis[u]=0;
		int prev=u;
		while(st.top()!=u)
		{
			cnt++;
			adj[prev].erase(adj[prev].find(st.top()));
			adj[st.top()].erase(adj[st.top()].find(prev));
			cout<<st.top()<<' ';
			vis[st.top()]=0;
			prev=st.top();
			st.pop();
		}
		adj[prev].erase(adj[prev].find(u));
		adj[u].erase(adj[u].find(prev));
		cout<<'\n';
		return;
	}
	vis[u]=1;
	for(auto i : adj[u])
	{
		if(i!=p)
		{
			dfs(i,u);
			if(cnt--) return;
			if(adj[u].empty()) return;
		}
	}
}

int main()
{
	ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
	int n,m;cin>>n>>m;
	for(int i=0;i<m;i++)
	{
		int u,v;cin>>u>>v;
		adj[u].insert(v);
		adj[v].insert(u);
	}
	cout<<'\n';
	for(int i=1;i<=n;i++)
	{
		while(adj[i].size()>0) dfs(i,-1);
	}
	return 0;
}

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