제출 #1257876

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1257876		brover29	Cijanobakterije (COCI21_cijanobakterije)	C++17	70 / 70	26 ms	15176 KiB

Main

#include <bits/stdc++.h>
//qwerty47924692
using namespace std;
using ll = long long;
const ll N=2e5+29;
const string br="617283";
ll n,m,ans,used[N];
vector<ll>g[N];
pair<ll,ll> dfs(ll v,ll pr){
    used[v]=1;
    pair<ll,ll>ans={1,v};
    for(ll to:g[v]){
        if(to==pr)continue;
        auto p=dfs(to,v);
        p.first++;
        ans=max(ans,p);
    }
    return ans;
}
int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    cin>>n>>m;
    for(ll i=1;i<=m;i++){
        ll v,u;
        cin>>v>>u;
        g[v].push_back(u);
        g[u].push_back(v);
    }
    for(ll i=1;i<=n;i++){
        if(used[i])continue;
        ans+=dfs(dfs(i,0).second,0 ).first;
      //  cout<<ans<<' ';
    }
    cout<<ans;
}

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