Submission #334532

#	Time	Username	Problem	Language	Result	Execution time	Memory
334532		VodkaInTheJar	Untitled (POI11_smi)	C++14	50 / 100	3095 ms	112748 KiB

Main

#include <bits/stdc++.h>
#pragma GCC optimize("O3")
#define endl '\n'
 
using namespace std;
 
const int maxn = 1e5 + 3; 
 
int n, m; 
multiset <int> adj[maxn];
void read()
{
	cin >> n >> m;
	for (int i = 1; i <= m; i++)
	{
		int a, b, s, t; 
		cin >> a >> b >> s >> t;
		
		if (s == t)
		continue;
		
		adj[a].insert(b);
		adj[b].insert(a);
	}
}
 
int depth[maxn];
int par[maxn];
vector <int> cycle;
void dfs(int ver)
{
	for (auto i: adj[ver])
	{
		if (depth[i] == -1)
		{
			par[i] = ver;
			depth[i] = depth[ver] + 1;
			dfs(i);
		}
		
		else 
		{
			if (depth[i] < depth[ver] - 1)
			{
				cycle.clear();
				int curr = ver;
				while (curr != i)
				{
					cycle.push_back(curr);
					curr = par[curr];
				}
				
				cycle.push_back(curr);
			}
		}
	}	
}

void solve()
{
	for (int i = 1; i <= n; i++)
	if ((int)adj[i].size() % 2 == 1)
	{
		cout << "NIE" << endl;
		return;
	}
	
	vector <vector <int> > ans;
	for (;;)
	{
		int ver = -1; 
		for (int i = 1; i <= n; i++)
		if (!adj[i].empty())
		{
			ver = i;
			break;
		}
		
		if (ver == -1)
		break;
		
		memset(depth, -1, sizeof(depth));
		dfs(ver);
	    cycle.push_back(cycle[0]);
	    
	    for (int i = 0; i < (int)cycle.size()-1; i++)
	    {
			adj[cycle[i]].erase(adj[cycle[i]].find(cycle[i+1]));
			adj[cycle[i+1]].erase(adj[cycle[i+1]].find(cycle[i]));
		}
		
		ans.push_back(cycle);
	}
	
	cout << (int)ans.size() << endl;
	for (auto i: ans)
	{
		cout << (int)i.size()-1 << " ";
		for (auto j: i)
		cout << j << " "; 
		
		cout << endl;
	}
}
 
int main()
{
	ios_base::sync_with_stdio(false);
	cin.tie(nullptr);
	cout.tie(nullptr);
 
	read();
	solve();
}

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 10 / 10
• Subtask 5: 10 / 10
• Subtask 6: 0 / 10
• Subtask 7: 0 / 10
• Subtask 8: 0 / 10
• Subtask 9: 0 / 10
• Subtask 10: 0 / 10