제출 #376902

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
376902		54skyxenon	Traffic (IOI10_traffic)	C++11	0 / 100	17 ms	23788 KiB

traffic

#include <iostream>
#include <vector>
using namespace std;

#define ll long long

vector<int> adj[1000000];

ll DFS(int P[], int src, int par) {
    ll ret = 0;

    for (auto x : adj[src]) {
        if (x != par) {
            ret += DFS(P, x, src);
        }
    }

    return P[src] + ret;
}

int LocateCentre(int N, int P[], int S[], int D[]) {
    ll minCongestion = 2000000000;
    int ans = -1;

    for (int i = 0; i < N; i++) {
       int s = S[i];
       int d = D[i];
       adj[s].push_back(d);
       adj[d].push_back(s);
    }

    for (int i = 0; i < N; i++) {
        ll congestionHere = 0;

        for (auto c : adj[i]) {
            congestionHere += DFS(P, c, i);
        }

        if (congestionHere < minCongestion) {
            minCongestion = congestionHere;
            ans = i;
        }
    }

    return ans;
}

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