제출 #863221

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
863221		Cyber_Wolf	Cijanobakterije (COCI21_cijanobakterije)	C++17	70 / 70	66 ms	17612 KiB

Main

#include <bits/stdc++.h>

using namespace std;

#define lg long long 

const lg N = 2e5+5;

vector<lg> adj[N], path;
lg dist[N], mxmnode, vis[N];

void dfs(lg src, lg par = -1, lg d = 1)
{
	path.push_back(src);
	vis[src] = true;
	dist[src] = d;
	if(dist[src] > dist[mxmnode])
	{
		mxmnode = src;
	}
	for(auto it : adj[src])
	{
		if(it == par)	continue;
		dfs(it, src, d+1);
	}
	return;
}

int main()
{
	lg n, m;
	cin >> n >> m;
	for(int i = 0; i < m; i++)
	{
		lg u, v;
		cin >> u >> v;
		adj[u].push_back(v);
		adj[v].push_back(u);
	}
	lg ans = 0;
	for(int i = 1; i <= n; i++)
	{
		if(vis[i])	continue;
		path.clear();
		dfs(i, -1);
		for(auto it : path)	dist[it] = 0;
		path.clear();
		dfs(mxmnode, -1);
		ans += dist[mxmnode];
		mxmnode = 0;
	}
	cout << ans << '\n';
}

• Subtask 1: 15 / 15
• Subtask 2: 6 / 6
• Subtask 3: 6 / 6
• Subtask 4: 15 / 15
• Subtask 5: 28 / 28