제출 #1139070

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1139070		ozner77	새로운 문제 (POI13_luk)	C++20	40 / 100	2100 ms	196608 KiB

luk

#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define pb push_back
/*
#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
using namespace std;
#define ll long long
#define pb push_back
#define mp make_pair
#define f first
#define s second
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
typedef tree<int, null_type, less<int>, rb_tree_tag, tree_order_statistics_node_update> indexed_set;
typedef pair<ll,ll> pll;
typedef pair<int,int> pii;
typedef map<int,int> mii;
typedef map<ll,ll> mll;
bool com;*/
vector<bool> visited;
ll dfs(ll nodo,ll m,vector<vector<ll>> adj){
    ll res=m;
    for(auto x:adj[nodo]){
        res+=dfs(x,m,adj)-1;
    }
    return min(res,0LL);
}
int main(){
    ll n;
    cin>>n;
    visited.assign(n,false);
    vector<vector<ll>> adj(n);
    vector<vector<ll>> adj2(n);
    for(int i=0;i<n-1;i++){
        ll a,b;
        cin >> a >> b;
        a--;
        b--;
        adj2[a].pb(b);
        adj2[b].pb(a);
    }
    ll l=0;
    ll r=n;
    queue<ll> q;
    q.push(0);
    while(!q.empty()){
        ll nodo=q.front();
        q.pop();
        visited[nodo]=true;
        for(auto x:adj2[nodo]){
            if(!visited[x]){
                adj[nodo].pb(x);
                q.push(x);
            }
        }
    }
    while(l<r){
        ll m=(l+r)/2;
        if(dfs(0,m,adj)==0){
            r=m;
        }else{
            l=m+1;
        }
    }
    cout<<l<<"\n";
}
//GRANDE AGUUUUUUUUUUUUUUUUUUUS <3
//bue me mato

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