제출 #619381

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
619381		Icebear16	Traffic (IOI10_traffic)	C++14	0 / 100	4 ms	5420 KiB

traffic

#include "traffic.h"
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define INF 1e18//change to const int INF=1e18 if causing problem
const ll MOD=998244353;
const ll alt=1e10;
const ll inf=1e9+7;//Precalc is not a bad idea
//#define int ll
#define pb push_back
#define pf push_front
#define mp make_pair
#define fi first
#define se second
#define mod(a) (a+inf)%inf
#define all(a) a.begin(),a.end()
#define rall(a) a.rbegin(),a.rend()
#define sz(a) a.size()

vector<set<int> > adj(100000);
priority_queue<pair<int,int>,vector<pair<int,int> >,greater<pair<int,int> > > q;
vector<int> vis(100000,0);
vector<bool> visd(100000,false);

int LocateCentre(int N, int pp[], int s[], int d[]){
	for(int i=0;i<N-1;i++){
		adj[s[i]].insert(d[i]);
		adj[d[i]].insert(s[i]);
	}
	for(int i=0;i<N;i++){
		if(adj[i].size()<=1){
			q.push(mp(pp[i],i));
			visd[i]=true;
		}
	}
	while(sz(q)>1){
		int a=q.top().fi,b=q.top().se;
		q.pop();
		auto y=*adj[b].begin();
		pp[y]+=a;
		vis[y]+=1;
		adj[b].erase(b);
		if(sz(adj[y])-vis[y]==1){
			q.push(mp(pp[y],y));
			visd[y]=true;
		}
	}
    return q.top().se;
}
//Icebear16

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