제출 #312148

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
312148		AmineTrabelsi	Traffic (IOI10_traffic)	C++14	0 / 100	15 ms	23808 KiB

traffic

#include "bits/stdc++.h"
using namespace std;
using ll = long long;
#define pb push_back 
#define mp make_pair
#define f first
#define s second
#define sz(x) ((int)x.size())
#define all(x) x.begin(),x.end()
#define rall(x) x.rbegin(),x.rend()

// Hi
const int M = 1e6;
vector<int> gr[M];
int *people;
ll dfs(int i,int par){
	ll res = 0;
	for(auto u:gr[i]){
		if(u!= par){
			res += people[u] + dfs(u,i);
		}
	}
	return res;
}
ll LocateCentre(int n,int p[],int ff[],int d[]){
	for(int i=0;i<n-1;i++){
		gr[ff[i]].pb(d[i]);
		gr[d[i]].pb(ff[i]);
	}
	people = p;
	ll res = 1e18;
	int city = 0;
	for(int i=0;i<n;i++){
		ll x = dfs(i,i);
		if(x < res){
			res = x;
			city = i;
		}
	}
	return city;
}
/*
int main(){
	int p[5] = {10,10,10,20,20},s[4] = {0,1,2,3},d[4] = {1,2,3,4};
	cout<<LocateCentre(5,p,s,d)<<'\n';
	return 0;
}
*/

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