제출 #530928

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
530928		ivls	Cijanobakterije (COCI21_cijanobakterije)	C++14	15 / 70	187 ms	10876 KiB

Main

#include <bits/stdc++.h>

using namespace std;

mt19937 rnd(chrono::steady_clock::now().time_since_epoch().count());

using ll = long long;

const int inf = 2e9;

int n, m, mx, nm, dst[100100];
vector<int> g[100100];
bool used[100100];

void dfs(int v, int p = -1)
{
    used[v] = 1;
    dst[v] = (p == -1 ? 0 : dst[p] + 1);
    if (dst[v] > mx) { mx = dst[v]; nm = v; }
    for (auto u : g[v])
        if (u != p) dfs(u, v);
}

int diam(int v)
{
    mx = 0;
    dfs(v);
    mx = 0;
    dfs(nm);
    return mx;
}

int main()
{
    ios::sync_with_stdio(false); cin.tie(0); cout.tie(0);
    cin >> n >> m;
    for (int i = 1; i <= m; i++)
    {
        int u, v;
        cin >> u >> v;
        g[u].push_back(v);
        g[v].push_back(u);
    }
    int ans = 0, cnt = 0;
    for (int i = 1; i <= n; i++)
        if (!used[i])
        {
            cnt++;
            ans += diam(i);
        }
    cout << ans + cnt << '\n';
}

• Subtask 1: 15 / 15
• Subtask 2: 0 / 6
• Subtask 3: 0 / 6
• Subtask 4: 0 / 15
• Subtask 5: 0 / 28