Submission #426772

#	Time	Username	Problem	Language	Result	Execution time	Memory
426772		Emin2004	Traffic (IOI10_traffic)	C++14	100 / 100	1500 ms	153088 KiB

traffic

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

#define endl '\n'
#define pii pair <int, int>
#define pb push_back
#define F first
#define S second
#define ll long long
#define io ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0)
#define M_PI 3.14159265358979323846

const int N = 1000005;
const int mod = 1e9 + 7;

vector<int> a[N];
int w[N], dis[N], al, ans = INT_MAX, res;

void DFS(int node, int par){
    dis[node] = w[node];
    for(int i : a[node]){
        if(i == par) continue;
        DFS(i, node);
        dis[node] += dis[i];
    }
}

void get(int node, int par){
    int cur = al - dis[node];
    for(int i : a[node]){
        if(i == par) continue;
        cur = max(cur, dis[i]);
        get(i, node);
    }
    if(cur < ans) {
        ans = cur;
        res = node;
    }
}

int LocateCentre(int n, int r[], int to[], int from[]) {
    for(int i = 0; i < n - 1; i++){
        a[to[i]].pb(from[i]);
        a[from[i]].pb(to[i]);
    }
    for(int i = 0; i < n; i++){
        dis[i] = -1;
        w[i] = r[i];
    }
    DFS(0, 0);
    al = dis[0];
    get(0, 0);
    return res;
}

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