제출 #1103582

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1103582		SalihSahin	Parkovi (COCI22_parkovi)	C++14	0 / 110	595 ms	44620 KiB

Main

#include <bits/stdc++.h>
#define pb push_back
#define int long long
using namespace std;

const int mod = 998244353;
const int inf = 1e17;
const int N = 2e5+5;
const int W = 1e9;

vector<pair<int, int> > adj[N];
vector<int> distopar(N);
vector<int> taken;

pair<int, int> dfs(int node, int par, int limit, bool tk){ // max distance, park count
    vector<pair<int, int> > ch;
    for(auto itr: adj[node]){
        if(itr.first != par){
            distopar[itr.first] = itr.second;
            pair<int, int> p = dfs(itr.first, node, limit, tk);
            ch.pb(p);
        }
    }
    pair<int, int> calc = {0, 0};
    for(auto itr: ch){
        calc.second += itr.second;
        calc.first = max(calc.first, itr.first);
    }

    if(calc.first + distopar[node] > limit){
        calc.first = 0;
        calc.second++;
        if(tk) taken.pb(node);
    }
    else{
        calc.first += distopar[node];
    }

    return calc;
}

int32_t main(){
    cin.tie(0); cout.tie(0);
    ios_base::sync_with_stdio(false);
    int n, k;
    cin>>n>>k;
    for(int i = 0; i < n-1; i++){
        int u, v, c;
        cin>>u>>v>>c;
        adj[u].pb({v, c});
        adj[v].pb({u, c});
    }


    int l = 0, r = W*N;
    while(l < r){
        int m = (l + r)/2;

        pair<int, int> check = dfs(1, 1, m, 0);
        if(check.second <= k) r = m;
        else l = m + 1; 
    }

    cout<<l<<endl;
    dfs(1, 1, l, 1);
    for(auto itr: taken){
        cout<<itr<<" ";
    }
    cout<<endl;
    return 0;
}

• Subtask 1: 0 / 10
• Subtask 2: 0 / 10
• Subtask 3: 0 / 30
• Subtask 4: 0 / 60