Submission #312149

#	Time	Username	Problem	Language	Result	Execution time	Memory
312149		AmineTrabelsi	Traffic (IOI10_traffic)	C++17	25 / 100	5047 ms	29816 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;
pair<ll,ll> dfs(int i,int par){
	pair<ll,ll> res = {-1,-1};
	for(auto u:gr[i]){
		if(u!= par){
			pair<ll,ll> p = dfs(u,i);
			if(res.f == -1){
				res.f = p.f+people[u];
			}else res.s = p.f+people[u];
		}
	}
	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++){
		pair<ll,ll> x = dfs(i,i);
		if(max(x.f,x.s) < res){
			res = max(x.f,x.s);
			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;
}
*/

• Subtask 1: 25 / 25
• Subtask 2: 0 / 25
• Subtask 3: 0 / 25
• Subtask 4: 0 / 25