Submission #336177

#	Time	Username	Problem	Language	Result	Execution time	Memory
336177		rqi	Traffic (IOI10_traffic)	C++14	100 / 100	1184 ms	170860 KiB

traffic

#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef vector<int> vi;


#define pb push_back
#define mp make_pair
#define f first
#define s second

const ll INF = 1e18;
const int mx = 1000005;
vi adj[mx];
ll sub[mx];
ll sum = 0;
pair<ll, int> ans = mp(INF, -1);

void genSub(int node, int prv = -1){
	ll val = 0;
	for(auto u: adj[node]){
		if(u == prv) continue;
		genSub(u, node);
		sub[node]+=sub[u];
		val = max(val, sub[u]);
	}
	val = max(val, sum-sub[node]);
	ans = min(ans, mp(val, node));
}

int LocateCentre(int N, int P[], int S[], int D[]) {
	for(int i = 0; i < N-1; i++){
		adj[S[i]].pb(D[i]);
		adj[D[i]].pb(S[i]);
	}
	for(int i = 0; i < N; i++){
		sub[i]+=P[i];
		sum+=P[i];
	}
	genSub(0);
	return ans.s;
}

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